Merge branch 'perf-testcase-set'

Makefile

@@ -1023,3 +1023,31 @@ massif-%: ecmascript-testcases/%.js duk
 massif-helloworld: massif-test-dev-hello-world
 massif-deepmerge: massif-test-dev-deepmerge
 massif-arcfour: massif-test-dev-arcfour
+
+# Perf test placeholder, quite inaccurate, simply based on "time".
+# - Duktape is interpreted and uses reference counting
+# - Python and Perl are interpreted and also use reference counting
+# - Ruby and Lua are interpreted but don't use reference counting
+# - Rhino compiles to Java bytecode and is ultimately JITed
+perftest: duk
+	for i in perf-testcases/*.js; do echo \
+		"`basename $$i`:" \
+		"duk `time -f %U -o /tmp/time --quiet ./duk $$i >/dev/null 2>&1; cat /tmp/time; rm /tmp/time`" \
+		"rhino `time -f %U -o /tmp/time --quiet rhino $$i >/dev/null 2>&1; cat /tmp/time; rm /tmp/time`" \
+		"lua `time -f %U -o /tmp/time --quiet lua $${i%%.js}.lua >/dev/null 2>&1; cat /tmp/time; rm /tmp/time`" \
+		"python `time -f %U -o /tmp/time --quiet python $${i%%.js}.py >/dev/null 2>&1; cat /tmp/time; rm /tmp/time`" \
+		"perl `time -f %U -o /tmp/time --quiet perl $${i%%.js}.pl >/dev/null 2>&1; cat /tmp/time; rm /tmp/time`" \
+		"ruby `time -f %U -o /tmp/time --quiet ruby $${i%%.js}.rb >/dev/null 2>&1; cat /tmp/time; rm /tmp/time`"; \
+	done
+perftestduk: duk
+	for i in perf-testcases/*.js; do echo \
+		"`basename $$i`:" \
+		"duk `time -f %U -o /tmp/time ./duk $$i >/dev/null 2>&1; cat /tmp/time; rm /tmp/time`"; \
+	done
+perftestduk3: duk
+	for i in perf-testcases/*.js; do echo \
+		"`basename $$i`: duk" \
+		"`time -f %U -o /tmp/time ./duk $$i >/dev/null 2>&1; cat /tmp/time; rm /tmp/time`" \
+		"`time -f %U -o /tmp/time ./duk $$i >/dev/null 2>&1; cat /tmp/time; rm /tmp/time`" \
+		"`time -f %U -o /tmp/time ./duk $$i >/dev/null 2>&1; cat /tmp/time; rm /tmp/time`"; \
+	done

perf-testcases/test-array-read.js

@@ -0,0 +1,19 @@
+/*
+ *  Basic array read performance
+ */
+
+function test() {
+    var arr = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];
+    var i;
+    var ign;
+
+    for (i = 0; i < 1e8; i++) {
+        ign = arr[7];
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+}

perf-testcases/test-array-read.lua

@@ -0,0 +1,8 @@
+function test()
+    local arr = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }
+    for i=1,1e8 do
+        local ign = arr[8]
+    end
+end
+
+test()

perf-testcases/test-array-read.pl

@@ -0,0 +1,11 @@
+sub test {
+    my @arr = ( 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 );
+    my $i;
+    my $ign;
+
+    for ($i = 0; $i < 1e8; $i++) {
+        $ign = $arr[7];
+    }
+}
+
+test();

perf-testcases/test-array-read.py

@@ -0,0 +1,8 @@
+def test():
+	arr = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];
+	i = 0
+	while i < 1e8:
+		ign = arr[7]
+		i += 1
+
+test()

perf-testcases/test-array-read.rb

@@ -0,0 +1,10 @@
+def test()
+    arr = Array[ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
+    i = 0
+    while i < 1e8 do
+        ign = arr[7]
+        i += 1
+    end
+end
+
+test()

perf-testcases/test-array-write.js

@@ -0,0 +1,18 @@
+/*
+ *  Basic array write performance
+ */
+
+function test() {
+    var arr = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];
+    var i;
+
+    for (i = 0; i < 1e8; i++) {
+        arr[7] = 234;
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+}

perf-testcases/test-array-write.lua

@@ -0,0 +1,8 @@
+function test()
+    local arr = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }
+    for i=1,1e8 do
+        arr[8] = 234
+    end
+end
+
+test()

perf-testcases/test-array-write.pl

@@ -0,0 +1,11 @@
+sub test {
+    my @arr = ( 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 );
+    my $i;
+    my $ign;
+
+    for ($i = 0; $i < 1e8; $i++) {
+        $arr[7] = 234;
+    }
+}
+
+test();

perf-testcases/test-array-write.py

@@ -0,0 +1,8 @@
+def test():
+	arr = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ];
+	i = 0
+	while i < 1e8:
+		arr[7] = 234
+		i += 1
+
+test()

perf-testcases/test-array-write.rb

@@ -0,0 +1,10 @@
+def test()
+    arr = Array[ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
+    i = 0
+    while i < 1e8 do
+        arr[7] = 234
+        i += 1
+    end
+end
+
+test()

perf-testcases/test-bitwise-ops.js

@@ -0,0 +1,23 @@
+function test() {
+    var x, y, z;
+    var i, n;
+
+    x = 0xdeadbeef;
+    y = 0xcafed00d;
+
+    for (i = 0, n = 1e7; i < n; i++) {
+        z = x & y;
+        z = x | y;
+        z = x ^ y;
+        z = x << y;
+        z = x >> y;
+        z = x >>> y;
+        z = ~x;
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+}

perf-testcases/test-call-basic.js

@@ -0,0 +1,21 @@
+/*
+ *  Basic function call performance.
+ *
+ *  Focuses on the cases where "fast returns" are possible.
+ */
+
+function test() {
+    var i;
+
+    function f() { return; }
+
+    for (i = 0; i < 1e8; i++) {
+        f();
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+}

perf-testcases/test-call-basic.lua

@@ -0,0 +1,11 @@
+function test()
+    local function f()
+        return
+    end
+
+    for i=1,1e8 do
+        f()
+    end
+end
+
+test()

perf-testcases/test-call-basic.pl

@@ -0,0 +1,12 @@
+sub test {
+  my $i;
+
+  sub f { return; }
+
+  $i = 0;
+  for ($i = 0; $i < 1e8; $i++) {
+    f();
+  }
+}
+
+test();

perf-testcases/test-call-basic.py

@@ -0,0 +1,10 @@
+def test():
+	def f():
+		return
+
+	i = 0
+	while i < 1e8:
+		f()
+		i += 1
+
+test()

perf-testcases/test-call-basic.rb

@@ -0,0 +1,11 @@
+def test()
+  def f() return end
+
+  i = 0
+  while i < 1e8 do
+    f()
+    i += 1
+  end
+end
+
+test()

perf-testcases/test-empty-loop.js

@@ -0,0 +1,12 @@
+function test() {
+    var i;
+
+    for (i = 0; i < 1e8; i++) {
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+}

perf-testcases/test-empty-loop.lua

@@ -0,0 +1,6 @@
+local function test()
+    local i = 0
+    while i < 1e8 do i = i + 1 end
+    --for i=1,1e8 do end
+end
+test()

perf-testcases/test-empty-loop.pl

@@ -0,0 +1,8 @@
+sub test {
+    my $i;
+
+    for ($i = 0; $i < 1e8; $i++) {
+    }
+}
+
+test();

perf-testcases/test-empty-loop.py

@@ -0,0 +1,6 @@
+def test():
+	i = 0
+	while i < 1e8:
+		i += 1
+
+test()

perf-testcases/test-empty-loop.rb

@@ -0,0 +1,8 @@
+def test()
+    i = 0
+    while i < 1e8 do
+        i += 1
+    end
+end
+
+test()

perf-testcases/test-fib.js

@@ -0,0 +1,13 @@
+/*
+ *  Fibonacci test, exercises call handling and recursion
+ */
+
+function fib(n) {
+    return n <= 1 ? n : fib(n - 2) + fib(n - 1);
+}
+
+try {
+    print(fib(35));
+} catch (e) {
+    print(e.stack || e);
+}

perf-testcases/test-fib.lua

@@ -0,0 +1,9 @@
+function fib(n)
+    if n <= 1 then
+        return n
+    else
+        return fib(n - 2) + fib(n - 1)
+    end
+end
+
+print(fib(35))

perf-testcases/test-fib.pl

@@ -0,0 +1,9 @@
+sub fib {
+  my $n = shift;
+  if ($n <= 1) {
+    return $n;
+  } else {
+    return fib($n - 2) + fib($n - 1);
+  }
+}
+print fib(35) . "\n";

perf-testcases/test-fib.py

@@ -0,0 +1,7 @@
+def fib(n):
+	if n <= 1:
+		return n
+	else:
+		return fib(n - 2) + fib(n - 1)
+
+print(fib(35))

perf-testcases/test-fib.rb

@@ -0,0 +1,9 @@
+def fib(n)
+  if n <= 1 then
+    return n
+  else
+    return fib(n - 2) + fib(n - 1)
+  end
+end
+
+print(fib(35).to_s + "\n")

perf-testcases/test-hello-world.js

@@ -0,0 +1,3 @@
+// Hello world test for memory testing
+
+print('Hello world!');

perf-testcases/test-hello-world.lua

@@ -0,0 +1,3 @@
+-- Hello world test for memory testing.
+
+print('hello world!')

perf-testcases/test-hello-world.pl

@@ -0,0 +1 @@
+print("Hello world!\n");

perf-testcases/test-hello-world.py

@@ -0,0 +1 @@
+print('Hello world!')

perf-testcases/test-hello-world.rb

@@ -0,0 +1 @@
+print("Hello world!\n");

perf-testcases/test-hex-decode.js

@@ -0,0 +1,26 @@
+function test() {
+    var tmp1 = [];
+    var tmp2 = [];
+    var i, n;
+
+    print('build');
+    for (i = 0; i < 1024; i++) {
+        tmp1.push(Math.floor(Math.random() * 16).toString(16))
+    }
+    tmp1 = tmp1.join('');
+    for (i = 0; i < 1024; i++) {
+        tmp2.push(tmp1);
+    }
+    tmp2 = tmp2.join('');
+
+    print('run');
+    for (i = 0; i < 10000; i++) {
+        Duktape.dec('hex', tmp2);
+    }
+}
+
+if (typeof Duktape === 'object') {
+    test();
+} else {
+    // Ignore on e.g. Rhino
+}

perf-testcases/test-hex-decode.py

@@ -0,0 +1,21 @@
+import math
+import random
+
+def test():
+	tmp1 = []
+	tmp2 = []
+	
+	print('build')
+	for i in xrange(1024):
+		tmp1.append('%x' % math.floor(random.random() * 16))
+	tmp1 = ''.join(tmp1)
+	for i in xrange(1024):
+		tmp2.append(tmp1)
+	tmp2 = ''.join(tmp2)
+
+	#print(len(tmp2))
+	print('run')
+	for i in xrange(10000):
+		ign = tmp2.decode('hex')
+
+test()

perf-testcases/test-json-serialize.js

@@ -0,0 +1,30 @@
+function build() {
+    var obj = {};
+
+    obj.key1 = 'foo';
+    obj.key2 = 'bar';
+    obj.key3 = 'quux';
+    obj.key4 = 'baz';
+    obj.key5 = 'quuux';
+    obj.key6 = [ 'foo', 'bar', 'quux', 'baz', 'quuux' ];
+    obj.key7 = [ undefined, null, true, 123.456, 1e200, {}, {}, {} ];
+
+    return obj;
+}
+
+function test() {
+    var obj;
+    var i;
+    var ignore;
+
+    obj = build();
+    for (i = 0; i < 1e5; i++) {
+        ignore = JSON.stringify(obj);
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+}

perf-testcases/test-json-serialize.py

@@ -0,0 +1,22 @@
+import json
+
+def build():
+	obj = {}
+	obj['key1'] = 'foo'
+	obj['key2'] = 'bar'
+	obj['key3'] = 'quux'
+	obj['key4'] = 'baz'
+	obj['key5'] = 'quuux'
+	obj['key6'] = [ 'foo', 'bar', 'quux', 'baz', 'quuux' ]
+	obj['key7'] = [ None, None, True, 123.456, 1e200, {}, {}, {} ]
+
+	return obj
+
+def test():
+	obj = build()
+	i = 0
+	while i < 1e5:
+		ignore = json.dumps(obj)
+		i += 1
+
+test()

perf-testcases/test-json-string-bench.js

@@ -0,0 +1,37 @@
+function rndAscii(len) {
+    var res = [];
+    var i;
+    for (i = 0; i < len; i++) {
+        if (Math.random() < 0.08) {
+            res.push(String.fromCharCode(Math.floor(Math.random() * 128)));
+        } else {
+            res.push(String.fromCharCode(Math.floor(Math.random() * 0x5f) + 0x20));
+        }
+    }
+    return res.join('');
+}
+
+function test() {
+    var sz = 1;
+
+    for (var i = 0; i <= 20; i++) {
+        var s = rndAscii(sz);
+        var obj = { key: s };
+        var start = Date.now();
+        var ign = JSON.stringify(obj);
+        //print(ign);
+        var end = Date.now();
+        var diff = end - start;
+        print(sz, start, end, diff,
+              diff * 1000 / sz,                     // microseconds/byte
+              (sz / (1024 * 1024)) / (diff / 1000)  // megabytes/second
+              );
+        sz *= 2;
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+}

perf-testcases/test-prop-read.js

@@ -0,0 +1,19 @@
+/*
+ *  Basic property read performance
+ */
+
+function test() {
+    var obj = { xxx1: 1, xxx2: 2, xxx3: 3, xxx4: 4, foo: 123 };
+    var i;
+    var ign;
+
+    for (i = 0; i < 1e8; i++) {
+        ign = obj.foo;
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+}

perf-testcases/test-prop-read.lua

@@ -0,0 +1,8 @@
+function test()
+    local obj = { xxx1 = 1, xxx2 = 2, xxx3 = 3, xxx4 = 4, foo = 123 }
+    for i=1,1e8 do
+        local ign = obj.foo
+    end
+end
+
+test()

perf-testcases/test-prop-read.pl

@@ -0,0 +1,11 @@
+sub test {
+    my %obj = ( 'xxx1' => 1, 'xxx2' => 2, 'xxx3' => 3, 'xxx4' => 4, 'foo' => 123 );
+    my $i;
+    my $ign;
+
+    for ($i = 0; $i < 1e8; $i++) {
+        $ign = $obj{'foo'};
+    }
+}
+
+test();

perf-testcases/test-prop-read.py

@@ -0,0 +1,8 @@
+def test():
+	obj = { 'xxx1': 1, 'xxx2': 2, 'xxx3': 3, 'xxx4': 4, 'foo': 123 }
+	i = 0
+	while i < 1e8:
+		ign = obj['foo']
+		i += 1
+
+test()

perf-testcases/test-prop-read.rb

@@ -0,0 +1,11 @@
+def test()
+    obj = Hash["xxx1" => 1, "xxx2" => 2, "xxx3" => 3, "xxx4" => 4, "foo" => 123];
+
+    i = 0
+    while i < 1e8 do
+        ign = obj['foo']
+        i += 1
+    end
+end
+
+test()

perf-testcases/test-prop-write.js

@@ -0,0 +1,18 @@
+/*
+ *  Basic property write performance
+ */
+
+function test() {
+    var obj = { xxx1: 1, xxx2: 2, xxx3: 3, xxx4: 4, foo: 123 };
+    var i;
+
+    for (i = 0; i < 1e8; i++) {
+        obj.foo = 234;
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+}

perf-testcases/test-prop-write.lua

@@ -0,0 +1,8 @@
+function test()
+    local obj = { xxx1 = 1, xxx2 = 2, xxx3 = 3, xxx4 = 4, foo = 123 }
+    for i=1,1e8 do
+        obj.foo = 234
+    end
+end
+
+test()

perf-testcases/test-prop-write.pl

@@ -0,0 +1,10 @@
+sub test {
+    my %obj = ( 'xxx1' => 1, 'xxx2' => 2, 'xxx3' => 3, 'xxx4' => 4, 'foo' => 123 );
+    my $i;
+
+    for ($i = 0; $i < 1e8; $i++) {
+        $obj{'foo'} = 234;
+    }
+}
+
+test();

perf-testcases/test-prop-write.py

@@ -0,0 +1,8 @@
+def test():
+	obj = { 'xxx1': 1, 'xxx2': 2, 'xxx3': 4, 'xxx4': 4, 'foo': 123 }
+	i = 0
+	while i < 1e8:
+		obj['foo'] = 234
+		i += 1
+
+test()

perf-testcases/test-prop-write.rb

@@ -0,0 +1,11 @@
+def test()
+    obj = Hash["xxx1" => 1, "xxx2" => 2, "xxx3" => 3, "xxx4" => 4, "foo" => 123];
+
+    i = 0
+    while i < 1e8 do
+        obj['foo'] = 234
+        i += 1
+    end
+end
+
+test()

perf-testcases/test-reg-readwrite-object.js

@@ -0,0 +1,139 @@
+/*
+ *  Test bytecode register assignments with object values.  Involves only
+ *  a dispatch and a tval copy for a heap-allocated tval.
+ */
+
+function test() {
+    var a, b, c, d;
+    var i;
+
+    a = {}; b = {}; c = {}; d = {};
+
+    for (i = 0; i < 1e6; i++) {
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+}

perf-testcases/test-reg-readwrite-object.lua

@@ -0,0 +1,132 @@
+function test()
+    local a, b, c, d, i;
+
+    a = {}
+    b = {}
+    c = {}
+    d = {}
+
+    for i=1,1e6 do
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+    end
+end
+
+test()

perf-testcases/test-reg-readwrite-object.pl

@@ -0,0 +1,130 @@
+sub test {
+    my $a, $b, $c, $d;
+    my $i;
+
+    $a = (); $b = (); $c = (); $d = ();
+
+    for ($i = 0; $i < 1e6; $i++) {
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+    }
+}
+
+test();

perf-testcases/test-reg-readwrite-object.py

@@ -0,0 +1,131 @@
+def test():
+	a = {}
+	b = {}
+	c = {}
+	d = {}
+
+	i = 0
+	while i < 1e6:
+	        # 100
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+	        # 100
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+	        # 100
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+	        # 100
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+	        # 100
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+	        # 100
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+	        # 100
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+	        # 100
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+	        # 100
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+	        # 100
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+	        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+		i += 1
+
+test()

perf-testcases/test-reg-readwrite-object.rb

@@ -0,0 +1,130 @@
+def test()
+    a = Hash[]; b = Hash[]; c = Hash[]; d = Hash[]
+
+    i = 0
+    while i < 1e6 do
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        i += 1
+    end
+end
+
+test()

perf-testcases/test-reg-readwrite-plain.js

@@ -0,0 +1,139 @@
+/*
+ *  Test bytecode register assignments with plain values.  Involves only
+ *  a dispatch and a tval copy for a non-heap-allocated tval.
+ */
+
+function test() {
+    var a, b, c, d;
+    var i;
+
+    a = 1; b = 2; c = 3; d = 4;
+
+    for (i = 0; i < 1e6; i++) {
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+
+        // 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b;
+    }
+}
+
+try {
+    test();
+} catch (e) {
+    print(e.stack || e);
+}

perf-testcases/test-reg-readwrite-plain.lua

@@ -0,0 +1,132 @@
+function test()
+    local a, b, c, d, i;
+
+    a = 1
+    b = 2
+    c = 3
+    d = 4
+
+    for i=1,1e6 do
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        -- 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+    end
+end
+
+test()

perf-testcases/test-reg-readwrite-plain.pl

@@ -0,0 +1,130 @@
+sub test {
+    my $a, $b, $c, $d;
+    my $i;
+
+    $a = 1; $b = 2; $c = 3; $d = 4;
+
+    for ($i = 0; $i < 1e6; $i++) {
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+
+        # 100
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+        $a = $a; $a = $b; $a = $c; $a = $d; $b = $a; $b = $b; $b = $c; $b = $d; $c = $a; $c = $b;
+    }
+}
+
+test();

perf-testcases/test-reg-readwrite-plain.py

@@ -0,0 +1,131 @@
+def test():
+	a = 1
+	b = 2
+	c = 3
+	d = 4
+
+	i = 0
+	while i < 1e6:
+		# 100
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+		# 100
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+		# 100
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+		# 100
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+		# 100
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+		# 100
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+		# 100
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+		# 100
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+		# 100
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+		# 100
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+		a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+		i += 1
+
+test()

perf-testcases/test-reg-readwrite-plain.rb

@@ -0,0 +1,130 @@
+def test()
+    a = 1; b = 2; c = 3; d = 4
+
+    i = 0
+    while i < 1e6 do
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        # 100
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+        a = a; a = b; a = c; a = d; b = a; b = b; b = c; b = d; c = a; c = b
+
+        i += 1
+    end
+end
+
+test()