fix computation of stack register index

ChangeLog

@@ -1,3 +1,11 @@
+2006-05-20  avd  <avd@buzz.wiraqocha.local>
+
+	* jit/jit-rules-x86.c (_jit_gen_exch_top): fix computation of stack
+	register index.
+
+	* jit/jit-reg-alloc.c (_jit_regs_assign): micro optimization by
+	changing nesting order of for and if statements.
+
 2006-05-19  Aleksey Demakov  <ademakov@gmail.com>
 
 	* jit-reg-alloc.h, jit/jit-reg-alloc.c: determine if input values

jit/jit-reg-alloc.c

@@ -3740,23 +3740,17 @@ _jit_regs_assign(jit_gencode_t gen, _jit_regs_t *regs)
 #endif
 
 	/* Set clobber flags. */
-	for(index = 0; index < JIT_NUM_REGS; index++)
+	if(regs->clobber_all)
 	{
-		if((_jit_reg_info[index].flags & JIT_REG_FIXED)
-		   || jit_reg_is_used(gen->permanent, index))
-		{
-			continue;
-		}
-		if(regs->clobber_all)
+		for(index = 0; index < JIT_NUM_REGS; index++)
 		{
+			if((_jit_reg_info[index].flags & JIT_REG_FIXED)
+			   || jit_reg_is_used(gen->permanent, index))
+			{
+				continue;
+			}
 			jit_reg_set_used(regs->clobber, index);
 		}
-#if 0
-		if(jit_reg_is_used(regs->clobber, index))
-		{
-			jit_reg_set_used(gen->touched, index);
-		}
-#endif
 	}
 
 	/* Spill all clobbered registers. */

jit/jit-reg-alloc.h

@@ -74,11 +74,6 @@ void _jit_regs_get_reg_pair(jit_gencode_t gen, int not_this1, int not_this2,
  */
 #define _JIT_REGS_SCRATCH_MAX		6
 
-/*
- * The maximum number of stack register exchanges.
- */
-#define _JIT_REGS_MAX_EXCHANGES		16
-
 /*
  * Flags for _jit_regs_init().
  */

jit/jit-rules-x86.c

@@ -775,11 +775,11 @@ _jit_gen_exch_top(jit_gencode_t gen, int reg, int pop)
 		jit_cache_setup_output(2);
 		if(pop)
 		{
-			x86_fstp(inst, reg - X86_REG_ST0);
+			x86_fstp(inst, fp_stack_index(gen, reg));
 		}
 		else
 		{
-			x86_fxch(inst, reg - X86_REG_ST0);
+			x86_fxch(inst, fp_stack_index(gen, reg));
 		}
 		jit_cache_end_output();
 	}