diff --git a/winch/codegen/src/codegen/context.rs b/winch/codegen/src/codegen/context.rs
index 28b4a25daa..7bcedf0891 100644
--- a/winch/codegen/src/codegen/context.rs
+++ b/winch/codegen/src/codegen/context.rs
@@ -225,25 +225,29 @@ impl<'a, 'builtins> CodeGenContext<'a, 'builtins> {
     }
 
     /// Prepares arguments for emitting a unary operation.
+    ///
+    /// The `emit` function returns the `TypedReg` to put on the value stack.
     pub fn unop<F, M>(&mut self, masm: &mut M, size: OperandSize, emit: &mut F)
     where
-        F: FnMut(&mut M, Reg, OperandSize),
+        F: FnMut(&mut M, Reg, OperandSize) -> TypedReg,
         M: MacroAssembler,
     {
         let typed_reg = self.pop_to_reg(masm, None);
-        emit(masm, typed_reg.reg, size);
-        self.stack.push(typed_reg.into());
+        let dst = emit(masm, typed_reg.reg, size);
+        self.stack.push(dst.into());
     }
 
     /// Prepares arguments for emitting a binary operation.
+    ///
+    /// The `emit` function returns the `TypedReg` to put on the value stack.
     pub fn binop<F, M>(&mut self, masm: &mut M, size: OperandSize, mut emit: F)
     where
-        F: FnMut(&mut M, Reg, Reg, OperandSize),
+        F: FnMut(&mut M, Reg, Reg, OperandSize) -> TypedReg,
         M: MacroAssembler,
     {
         let src = self.pop_to_reg(masm, None);
         let dst = self.pop_to_reg(masm, None);
-        emit(masm, dst.reg, src.reg.into(), size);
+        let dst = emit(masm, dst.reg, src.reg.into(), size);
         self.free_reg(src);
         self.stack.push(dst.into());
     }
@@ -270,9 +274,11 @@ impl<'a, 'builtins> CodeGenContext<'a, 'builtins> {
     }
 
     /// Prepares arguments for emitting an i32 binary operation.
+    ///
+    /// The `emit` function returns the `TypedReg` to put on the value stack.
     pub fn i32_binop<F, M>(&mut self, masm: &mut M, mut emit: F)
     where
-        F: FnMut(&mut M, Reg, RegImm, OperandSize),
+        F: FnMut(&mut M, Reg, RegImm, OperandSize) -> TypedReg,
         M: MacroAssembler,
     {
         let top = self.stack.peek().expect("value at stack top");
@@ -283,8 +289,8 @@ impl<'a, 'builtins> CodeGenContext<'a, 'builtins> {
                 .pop_i32_const()
                 .expect("i32 const value at stack top");
             let typed_reg = self.pop_to_reg(masm, None);
-            emit(masm, typed_reg.reg, RegImm::i32(val), OperandSize::S32);
-            self.stack.push(typed_reg.into());
+            let dst = emit(masm, typed_reg.reg, RegImm::i32(val), OperandSize::S32);
+            self.stack.push(dst.into());
         } else {
             self.binop(masm, OperandSize::S32, |masm, dst, src, size| {
                 emit(masm, dst, src.into(), size)
@@ -293,9 +299,11 @@ impl<'a, 'builtins> CodeGenContext<'a, 'builtins> {
     }
 
     /// Prepares arguments for emitting an i64 binary operation.
+    ///
+    /// The `emit` function returns the `TypedReg` to put on the value stack.
     pub fn i64_binop<F, M>(&mut self, masm: &mut M, mut emit: F)
     where
-        F: FnMut(&mut M, Reg, RegImm, OperandSize),
+        F: FnMut(&mut M, Reg, RegImm, OperandSize) -> TypedReg,
         M: MacroAssembler,
     {
         let top = self.stack.peek().expect("value at stack top");
@@ -305,13 +313,13 @@ impl<'a, 'builtins> CodeGenContext<'a, 'builtins> {
                 .pop_i64_const()
                 .expect("i64 const value at stack top");
             let typed_reg = self.pop_to_reg(masm, None);
-            emit(masm, typed_reg.reg, RegImm::i64(val), OperandSize::S64);
-            self.stack.push(typed_reg.into());
+            let dst = emit(masm, typed_reg.reg, RegImm::i64(val), OperandSize::S64);
+            self.stack.push(dst.into());
         } else {
             self.binop(masm, OperandSize::S64, |masm, dst, src, size| {
                 emit(masm, dst, src.into(), size)
             });
-        }
+        };
     }
 
     /// Drops the last `n` elements of the stack, calling the provided
diff --git a/winch/codegen/src/stack.rs b/winch/codegen/src/stack.rs
index ffdfac397c..a8491882be 100644
--- a/winch/codegen/src/stack.rs
+++ b/winch/codegen/src/stack.rs
@@ -34,6 +34,22 @@ impl TypedReg {
             reg,
         }
     }
+
+    /// Create an f64 [`TypedReg`].
+    pub fn f64(reg: Reg) -> Self {
+        Self {
+            ty: WasmType::F64,
+            reg,
+        }
+    }
+
+    /// Create an f32 [`TypedReg`].
+    pub fn f32(reg: Reg) -> Self {
+        Self {
+            ty: WasmType::F32,
+            reg,
+        }
+    }
 }
 
 impl From<TypedReg> for Reg {
diff --git a/winch/codegen/src/visitor.rs b/winch/codegen/src/visitor.rs
index 4db1150e2c..ca74d0ffcc 100644
--- a/winch/codegen/src/visitor.rs
+++ b/winch/codegen/src/visitor.rs
@@ -203,6 +203,7 @@ where
             OperandSize::S32,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_add(dst, dst, src, size);
+                TypedReg::f32(dst)
             },
         );
     }
@@ -213,6 +214,7 @@ where
             OperandSize::S64,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_add(dst, dst, src, size);
+                TypedReg::f64(dst)
             },
         );
     }
@@ -223,6 +225,7 @@ where
             OperandSize::S32,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_sub(dst, dst, src, size);
+                TypedReg::f32(dst)
             },
         );
     }
@@ -233,6 +236,7 @@ where
             OperandSize::S64,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_sub(dst, dst, src, size);
+                TypedReg::f64(dst)
             },
         );
     }
@@ -243,6 +247,7 @@ where
             OperandSize::S32,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_mul(dst, dst, src, size);
+                TypedReg::f32(dst)
             },
         );
     }
@@ -253,6 +258,7 @@ where
             OperandSize::S64,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_mul(dst, dst, src, size);
+                TypedReg::f64(dst)
             },
         );
     }
@@ -263,6 +269,7 @@ where
             OperandSize::S32,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_div(dst, dst, src, size);
+                TypedReg::f32(dst)
             },
         );
     }
@@ -273,6 +280,7 @@ where
             OperandSize::S64,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_div(dst, dst, src, size);
+                TypedReg::f64(dst)
             },
         );
     }
@@ -283,6 +291,7 @@ where
             OperandSize::S32,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_min(dst, dst, src, size);
+                TypedReg::f32(dst)
             },
         );
     }
@@ -293,6 +302,7 @@ where
             OperandSize::S64,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_min(dst, dst, src, size);
+                TypedReg::f64(dst)
             },
         );
     }
@@ -303,6 +313,7 @@ where
             OperandSize::S32,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_max(dst, dst, src, size);
+                TypedReg::f32(dst)
             },
         );
     }
@@ -313,6 +324,7 @@ where
             OperandSize::S64,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_max(dst, dst, src, size);
+                TypedReg::f64(dst)
             },
         );
     }
@@ -323,6 +335,7 @@ where
             OperandSize::S32,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_copysign(dst, dst, src, size);
+                TypedReg::f32(dst)
             },
         );
     }
@@ -333,6 +346,7 @@ where
             OperandSize::S64,
             &mut |masm: &mut M, dst, src, size| {
                 masm.float_copysign(dst, dst, src, size);
+                TypedReg::f64(dst)
             },
         );
     }
@@ -341,6 +355,7 @@ where
         self.context
             .unop(self.masm, OperandSize::S32, &mut |masm, reg, size| {
                 masm.float_abs(reg, size);
+                TypedReg::f32(reg)
             });
     }
 
@@ -348,6 +363,7 @@ where
         self.context
             .unop(self.masm, OperandSize::S64, &mut |masm, reg, size| {
                 masm.float_abs(reg, size);
+                TypedReg::f64(reg)
             });
     }
 
@@ -355,6 +371,7 @@ where
         self.context
             .unop(self.masm, OperandSize::S32, &mut |masm, reg, size| {
                 masm.float_neg(reg, size);
+                TypedReg::f32(reg)
             });
     }
 
@@ -362,6 +379,7 @@ where
         self.context
             .unop(self.masm, OperandSize::S64, &mut |masm, reg, size| {
                 masm.float_neg(reg, size);
+                TypedReg::f64(reg)
             });
     }
 
@@ -409,6 +427,7 @@ where
         self.context
             .unop(self.masm, OperandSize::S32, &mut |masm, reg, size| {
                 masm.float_sqrt(reg, reg, size);
+                TypedReg::f32(reg)
             });
     }
 
@@ -416,6 +435,7 @@ where
         self.context
             .unop(self.masm, OperandSize::S64, &mut |masm, reg, size| {
                 masm.float_sqrt(reg, reg, size);
+                TypedReg::f64(reg)
             });
     }
 
@@ -542,36 +562,42 @@ where
     fn visit_i32_add(&mut self) {
         self.context.i32_binop(self.masm, |masm, dst, src, size| {
             masm.add(dst, dst, src, size);
+            TypedReg::i32(dst)
         });
     }
 
     fn visit_i64_add(&mut self) {
         self.context.i64_binop(self.masm, |masm, dst, src, size| {
             masm.add(dst, dst, src, size);
+            TypedReg::i64(dst)
         });
     }
 
     fn visit_i32_sub(&mut self) {
         self.context.i32_binop(self.masm, |masm, dst, src, size| {
             masm.sub(dst, dst, src, size);
+            TypedReg::i32(dst)
         });
     }
 
     fn visit_i64_sub(&mut self) {
         self.context.i64_binop(self.masm, |masm, dst, src, size| {
             masm.sub(dst, dst, src, size);
+            TypedReg::i64(dst)
         });
     }
 
     fn visit_i32_mul(&mut self) {
         self.context.i32_binop(self.masm, |masm, dst, src, size| {
             masm.mul(dst, dst, src, size);
+            TypedReg::i32(dst)
         });
     }
 
     fn visit_i64_mul(&mut self) {
         self.context.i64_binop(self.masm, |masm, dst, src, size| {
             masm.mul(dst, dst, src, size);
+            TypedReg::i64(dst)
         });
     }
 
@@ -716,6 +742,7 @@ where
 
         self.context.unop(self.masm, S32, &mut |masm, reg, size| {
             masm.cmp_with_set(RegImm::i32(0), reg.into(), IntCmpKind::Eq, size);
+            TypedReg::i32(reg)
         });
     }
 
@@ -724,6 +751,7 @@ where
 
         self.context.unop(self.masm, S64, &mut |masm, reg, size| {
             masm.cmp_with_set(RegImm::i64(0), reg.into(), IntCmpKind::Eq, size);
+            TypedReg::i32(reg) // Return value for `i64.eqz` is an `i32`.
         });
     }
 
@@ -732,6 +760,7 @@ where
 
         self.context.unop(self.masm, S32, &mut |masm, reg, size| {
             masm.clz(reg, reg, size);
+            TypedReg::i32(reg)
         });
     }
 
@@ -740,6 +769,7 @@ where
 
         self.context.unop(self.masm, S64, &mut |masm, reg, size| {
             masm.clz(reg, reg, size);
+            TypedReg::i64(reg)
         });
     }
 
@@ -748,6 +778,7 @@ where
 
         self.context.unop(self.masm, S32, &mut |masm, reg, size| {
             masm.ctz(reg, reg, size);
+            TypedReg::i32(reg)
         });
     }
 
@@ -756,42 +787,49 @@ where
 
         self.context.unop(self.masm, S64, &mut |masm, reg, size| {
             masm.ctz(reg, reg, size);
+            TypedReg::i64(reg)
         });
     }
 
     fn visit_i32_and(&mut self) {
         self.context.i32_binop(self.masm, |masm, dst, src, size| {
             masm.and(dst, dst, src, size);
+            TypedReg::i32(dst)
         });
     }
 
     fn visit_i64_and(&mut self) {
         self.context.i64_binop(self.masm, |masm, dst, src, size| {
             masm.and(dst, dst, src, size);
+            TypedReg::i64(dst)
         });
     }
 
     fn visit_i32_or(&mut self) {
         self.context.i32_binop(self.masm, |masm, dst, src, size| {
             masm.or(dst, dst, src, size);
+            TypedReg::i32(dst)
         });
     }
 
     fn visit_i64_or(&mut self) {
         self.context.i64_binop(self.masm, |masm, dst, src, size| {
             masm.or(dst, dst, src, size);
+            TypedReg::i64(dst)
         });
     }
 
     fn visit_i32_xor(&mut self) {
         self.context.i32_binop(self.masm, |masm, dst, src, size| {
             masm.xor(dst, dst, src, size);
+            TypedReg::i32(dst)
         });
     }
 
     fn visit_i64_xor(&mut self) {
         self.context.i64_binop(self.masm, |masm, dst, src, size| {
             masm.xor(dst, dst, src, size);
+            TypedReg::i64(dst)
         });
     }
 
@@ -1368,6 +1406,7 @@ where
     fn cmp_i32s(&mut self, kind: IntCmpKind) {
         self.context.i32_binop(self.masm, |masm, dst, src, size| {
             masm.cmp_with_set(src, dst, kind, size);
+            TypedReg::i32(dst)
         });
     }
 
@@ -1375,6 +1414,7 @@ where
         self.context
             .i64_binop(self.masm, move |masm, dst, src, size| {
                 masm.cmp_with_set(src, dst, kind, size);
+                TypedReg::i32(dst) // Return value for comparisons is an `i32`.
             });
     }
 }
diff --git a/winch/filetests/filetests/x64/i64_eq/locals.wat b/winch/filetests/filetests/x64/i64_eq/locals.wat
index 8884b9d684..6761c2e7fe 100644
--- a/winch/filetests/filetests/x64/i64_eq/locals.wat
+++ b/winch/filetests/filetests/x64/i64_eq/locals.wat
@@ -31,7 +31,7 @@
 ;;   3b:	 4839c1               	cmp	rcx, rax
 ;;   3e:	 b900000000           	mov	ecx, 0
 ;;   43:	 400f94c1             	sete	cl
-;;   47:	 4889c8               	mov	rax, rcx
-;;   4a:	 4883c418             	add	rsp, 0x18
-;;   4e:	 5d                   	pop	rbp
-;;   4f:	 c3                   	ret	
+;;   47:	 89c8                 	mov	eax, ecx
+;;   49:	 4883c418             	add	rsp, 0x18
+;;   4d:	 5d                   	pop	rbp
+;;   4e:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_eq/params.wat b/winch/filetests/filetests/x64/i64_eq/params.wat
index aed5174e31..27fa74cb65 100644
--- a/winch/filetests/filetests/x64/i64_eq/params.wat
+++ b/winch/filetests/filetests/x64/i64_eq/params.wat
@@ -18,7 +18,7 @@
 ;;   20:	 4839c1               	cmp	rcx, rax
 ;;   23:	 b900000000           	mov	ecx, 0
 ;;   28:	 400f94c1             	sete	cl
-;;   2c:	 4889c8               	mov	rax, rcx
-;;   2f:	 4883c418             	add	rsp, 0x18
-;;   33:	 5d                   	pop	rbp
-;;   34:	 c3                   	ret	
+;;   2c:	 89c8                 	mov	eax, ecx
+;;   2e:	 4883c418             	add	rsp, 0x18
+;;   32:	 5d                   	pop	rbp
+;;   33:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_eqz/spilled.wat b/winch/filetests/filetests/x64/i64_eqz/spilled.wat
new file mode 100644
index 0000000000..b2e09645c2
--- /dev/null
+++ b/winch/filetests/filetests/x64/i64_eqz/spilled.wat
@@ -0,0 +1,25 @@
+;;! target = "x86_64"
+
+(module
+    (func (result i32)
+        i64.const 1
+        i64.eqz
+        block
+        end
+    )
+)
+;;    0:	 55                   	push	rbp
+;;    1:	 4889e5               	mov	rbp, rsp
+;;    4:	 4883ec08             	sub	rsp, 8
+;;    8:	 4c893424             	mov	qword ptr [rsp], r14
+;;    c:	 48c7c001000000       	mov	rax, 1
+;;   13:	 4883f800             	cmp	rax, 0
+;;   17:	 b800000000           	mov	eax, 0
+;;   1c:	 400f94c0             	sete	al
+;;   20:	 4883ec04             	sub	rsp, 4
+;;   24:	 890424               	mov	dword ptr [rsp], eax
+;;   27:	 8b0424               	mov	eax, dword ptr [rsp]
+;;   2a:	 4883c404             	add	rsp, 4
+;;   2e:	 4883c408             	add	rsp, 8
+;;   32:	 5d                   	pop	rbp
+;;   33:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_ge_s/locals.wat b/winch/filetests/filetests/x64/i64_ge_s/locals.wat
index 6339d2f231..6f91547cc3 100644
--- a/winch/filetests/filetests/x64/i64_ge_s/locals.wat
+++ b/winch/filetests/filetests/x64/i64_ge_s/locals.wat
@@ -31,7 +31,7 @@
 ;;   3b:	 4839c1               	cmp	rcx, rax
 ;;   3e:	 b900000000           	mov	ecx, 0
 ;;   43:	 400f9dc1             	setge	cl
-;;   47:	 4889c8               	mov	rax, rcx
-;;   4a:	 4883c418             	add	rsp, 0x18
-;;   4e:	 5d                   	pop	rbp
-;;   4f:	 c3                   	ret	
+;;   47:	 89c8                 	mov	eax, ecx
+;;   49:	 4883c418             	add	rsp, 0x18
+;;   4d:	 5d                   	pop	rbp
+;;   4e:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_ge_s/params.wat b/winch/filetests/filetests/x64/i64_ge_s/params.wat
index 49a3ab656f..f8b849b822 100644
--- a/winch/filetests/filetests/x64/i64_ge_s/params.wat
+++ b/winch/filetests/filetests/x64/i64_ge_s/params.wat
@@ -18,7 +18,7 @@
 ;;   20:	 4839c1               	cmp	rcx, rax
 ;;   23:	 b900000000           	mov	ecx, 0
 ;;   28:	 400f9dc1             	setge	cl
-;;   2c:	 4889c8               	mov	rax, rcx
-;;   2f:	 4883c418             	add	rsp, 0x18
-;;   33:	 5d                   	pop	rbp
-;;   34:	 c3                   	ret	
+;;   2c:	 89c8                 	mov	eax, ecx
+;;   2e:	 4883c418             	add	rsp, 0x18
+;;   32:	 5d                   	pop	rbp
+;;   33:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_ge_u/locals.wat b/winch/filetests/filetests/x64/i64_ge_u/locals.wat
index f8b2d35f91..626a483d27 100644
--- a/winch/filetests/filetests/x64/i64_ge_u/locals.wat
+++ b/winch/filetests/filetests/x64/i64_ge_u/locals.wat
@@ -31,7 +31,7 @@
 ;;   3b:	 4839c1               	cmp	rcx, rax
 ;;   3e:	 b900000000           	mov	ecx, 0
 ;;   43:	 400f93c1             	setae	cl
-;;   47:	 4889c8               	mov	rax, rcx
-;;   4a:	 4883c418             	add	rsp, 0x18
-;;   4e:	 5d                   	pop	rbp
-;;   4f:	 c3                   	ret	
+;;   47:	 89c8                 	mov	eax, ecx
+;;   49:	 4883c418             	add	rsp, 0x18
+;;   4d:	 5d                   	pop	rbp
+;;   4e:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_ge_u/params.wat b/winch/filetests/filetests/x64/i64_ge_u/params.wat
index 2ca43e57eb..68d707d11b 100644
--- a/winch/filetests/filetests/x64/i64_ge_u/params.wat
+++ b/winch/filetests/filetests/x64/i64_ge_u/params.wat
@@ -18,7 +18,7 @@
 ;;   20:	 4839c1               	cmp	rcx, rax
 ;;   23:	 b900000000           	mov	ecx, 0
 ;;   28:	 400f93c1             	setae	cl
-;;   2c:	 4889c8               	mov	rax, rcx
-;;   2f:	 4883c418             	add	rsp, 0x18
-;;   33:	 5d                   	pop	rbp
-;;   34:	 c3                   	ret	
+;;   2c:	 89c8                 	mov	eax, ecx
+;;   2e:	 4883c418             	add	rsp, 0x18
+;;   32:	 5d                   	pop	rbp
+;;   33:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_gt_s/locals.wat b/winch/filetests/filetests/x64/i64_gt_s/locals.wat
index 10c5c4ec36..a8e347eb47 100644
--- a/winch/filetests/filetests/x64/i64_gt_s/locals.wat
+++ b/winch/filetests/filetests/x64/i64_gt_s/locals.wat
@@ -31,7 +31,7 @@
 ;;   3b:	 4839c1               	cmp	rcx, rax
 ;;   3e:	 b900000000           	mov	ecx, 0
 ;;   43:	 400f9fc1             	setg	cl
-;;   47:	 4889c8               	mov	rax, rcx
-;;   4a:	 4883c418             	add	rsp, 0x18
-;;   4e:	 5d                   	pop	rbp
-;;   4f:	 c3                   	ret	
+;;   47:	 89c8                 	mov	eax, ecx
+;;   49:	 4883c418             	add	rsp, 0x18
+;;   4d:	 5d                   	pop	rbp
+;;   4e:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_gt_s/params.wat b/winch/filetests/filetests/x64/i64_gt_s/params.wat
index 5e30853e0a..ee6fc29536 100644
--- a/winch/filetests/filetests/x64/i64_gt_s/params.wat
+++ b/winch/filetests/filetests/x64/i64_gt_s/params.wat
@@ -18,7 +18,7 @@
 ;;   20:	 4839c1               	cmp	rcx, rax
 ;;   23:	 b900000000           	mov	ecx, 0
 ;;   28:	 400f9fc1             	setg	cl
-;;   2c:	 4889c8               	mov	rax, rcx
-;;   2f:	 4883c418             	add	rsp, 0x18
-;;   33:	 5d                   	pop	rbp
-;;   34:	 c3                   	ret	
+;;   2c:	 89c8                 	mov	eax, ecx
+;;   2e:	 4883c418             	add	rsp, 0x18
+;;   32:	 5d                   	pop	rbp
+;;   33:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_gt_u/locals.wat b/winch/filetests/filetests/x64/i64_gt_u/locals.wat
index 9890d2ca6b..203adfe7a5 100644
--- a/winch/filetests/filetests/x64/i64_gt_u/locals.wat
+++ b/winch/filetests/filetests/x64/i64_gt_u/locals.wat
@@ -31,7 +31,7 @@
 ;;   3b:	 4839c1               	cmp	rcx, rax
 ;;   3e:	 b900000000           	mov	ecx, 0
 ;;   43:	 400f97c1             	seta	cl
-;;   47:	 4889c8               	mov	rax, rcx
-;;   4a:	 4883c418             	add	rsp, 0x18
-;;   4e:	 5d                   	pop	rbp
-;;   4f:	 c3                   	ret	
+;;   47:	 89c8                 	mov	eax, ecx
+;;   49:	 4883c418             	add	rsp, 0x18
+;;   4d:	 5d                   	pop	rbp
+;;   4e:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_gt_u/params.wat b/winch/filetests/filetests/x64/i64_gt_u/params.wat
index e2e9d8654c..d2d5e91715 100644
--- a/winch/filetests/filetests/x64/i64_gt_u/params.wat
+++ b/winch/filetests/filetests/x64/i64_gt_u/params.wat
@@ -18,7 +18,7 @@
 ;;   20:	 4839c1               	cmp	rcx, rax
 ;;   23:	 b900000000           	mov	ecx, 0
 ;;   28:	 400f97c1             	seta	cl
-;;   2c:	 4889c8               	mov	rax, rcx
-;;   2f:	 4883c418             	add	rsp, 0x18
-;;   33:	 5d                   	pop	rbp
-;;   34:	 c3                   	ret	
+;;   2c:	 89c8                 	mov	eax, ecx
+;;   2e:	 4883c418             	add	rsp, 0x18
+;;   32:	 5d                   	pop	rbp
+;;   33:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_le_s/locals.wat b/winch/filetests/filetests/x64/i64_le_s/locals.wat
index d363621c3b..479cab4614 100644
--- a/winch/filetests/filetests/x64/i64_le_s/locals.wat
+++ b/winch/filetests/filetests/x64/i64_le_s/locals.wat
@@ -31,7 +31,7 @@
 ;;   3b:	 4839c1               	cmp	rcx, rax
 ;;   3e:	 b900000000           	mov	ecx, 0
 ;;   43:	 400f9ec1             	setle	cl
-;;   47:	 4889c8               	mov	rax, rcx
-;;   4a:	 4883c418             	add	rsp, 0x18
-;;   4e:	 5d                   	pop	rbp
-;;   4f:	 c3                   	ret	
+;;   47:	 89c8                 	mov	eax, ecx
+;;   49:	 4883c418             	add	rsp, 0x18
+;;   4d:	 5d                   	pop	rbp
+;;   4e:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_le_s/params.wat b/winch/filetests/filetests/x64/i64_le_s/params.wat
index 1df814ef2f..94ec675366 100644
--- a/winch/filetests/filetests/x64/i64_le_s/params.wat
+++ b/winch/filetests/filetests/x64/i64_le_s/params.wat
@@ -18,7 +18,7 @@
 ;;   20:	 4839c1               	cmp	rcx, rax
 ;;   23:	 b900000000           	mov	ecx, 0
 ;;   28:	 400f9ec1             	setle	cl
-;;   2c:	 4889c8               	mov	rax, rcx
-;;   2f:	 4883c418             	add	rsp, 0x18
-;;   33:	 5d                   	pop	rbp
-;;   34:	 c3                   	ret	
+;;   2c:	 89c8                 	mov	eax, ecx
+;;   2e:	 4883c418             	add	rsp, 0x18
+;;   32:	 5d                   	pop	rbp
+;;   33:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_le_u/locals.wat b/winch/filetests/filetests/x64/i64_le_u/locals.wat
index 85eddc5834..fcdcde1599 100644
--- a/winch/filetests/filetests/x64/i64_le_u/locals.wat
+++ b/winch/filetests/filetests/x64/i64_le_u/locals.wat
@@ -31,7 +31,7 @@
 ;;   3b:	 4839c1               	cmp	rcx, rax
 ;;   3e:	 b900000000           	mov	ecx, 0
 ;;   43:	 400f96c1             	setbe	cl
-;;   47:	 4889c8               	mov	rax, rcx
-;;   4a:	 4883c418             	add	rsp, 0x18
-;;   4e:	 5d                   	pop	rbp
-;;   4f:	 c3                   	ret	
+;;   47:	 89c8                 	mov	eax, ecx
+;;   49:	 4883c418             	add	rsp, 0x18
+;;   4d:	 5d                   	pop	rbp
+;;   4e:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_le_u/params.wat b/winch/filetests/filetests/x64/i64_le_u/params.wat
index 113b16ffac..11dd179ef6 100644
--- a/winch/filetests/filetests/x64/i64_le_u/params.wat
+++ b/winch/filetests/filetests/x64/i64_le_u/params.wat
@@ -18,7 +18,7 @@
 ;;   20:	 4839c1               	cmp	rcx, rax
 ;;   23:	 b900000000           	mov	ecx, 0
 ;;   28:	 400f96c1             	setbe	cl
-;;   2c:	 4889c8               	mov	rax, rcx
-;;   2f:	 4883c418             	add	rsp, 0x18
-;;   33:	 5d                   	pop	rbp
-;;   34:	 c3                   	ret	
+;;   2c:	 89c8                 	mov	eax, ecx
+;;   2e:	 4883c418             	add	rsp, 0x18
+;;   32:	 5d                   	pop	rbp
+;;   33:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_lt_s/locals.wat b/winch/filetests/filetests/x64/i64_lt_s/locals.wat
index 0a10518f54..a22f1ff703 100644
--- a/winch/filetests/filetests/x64/i64_lt_s/locals.wat
+++ b/winch/filetests/filetests/x64/i64_lt_s/locals.wat
@@ -32,7 +32,7 @@
 ;;   3b:	 4839c1               	cmp	rcx, rax
 ;;   3e:	 b900000000           	mov	ecx, 0
 ;;   43:	 400f9cc1             	setl	cl
-;;   47:	 4889c8               	mov	rax, rcx
-;;   4a:	 4883c418             	add	rsp, 0x18
-;;   4e:	 5d                   	pop	rbp
-;;   4f:	 c3                   	ret	
+;;   47:	 89c8                 	mov	eax, ecx
+;;   49:	 4883c418             	add	rsp, 0x18
+;;   4d:	 5d                   	pop	rbp
+;;   4e:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_lt_s/params.wat b/winch/filetests/filetests/x64/i64_lt_s/params.wat
index daafe27aa9..2de32038d0 100644
--- a/winch/filetests/filetests/x64/i64_lt_s/params.wat
+++ b/winch/filetests/filetests/x64/i64_lt_s/params.wat
@@ -19,7 +19,7 @@
 ;;   20:	 4839c1               	cmp	rcx, rax
 ;;   23:	 b900000000           	mov	ecx, 0
 ;;   28:	 400f9cc1             	setl	cl
-;;   2c:	 4889c8               	mov	rax, rcx
-;;   2f:	 4883c418             	add	rsp, 0x18
-;;   33:	 5d                   	pop	rbp
-;;   34:	 c3                   	ret	
+;;   2c:	 89c8                 	mov	eax, ecx
+;;   2e:	 4883c418             	add	rsp, 0x18
+;;   32:	 5d                   	pop	rbp
+;;   33:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_lt_u/locals.wat b/winch/filetests/filetests/x64/i64_lt_u/locals.wat
index eb51974302..cd62dc77d1 100644
--- a/winch/filetests/filetests/x64/i64_lt_u/locals.wat
+++ b/winch/filetests/filetests/x64/i64_lt_u/locals.wat
@@ -31,7 +31,7 @@
 ;;   3b:	 4839c1               	cmp	rcx, rax
 ;;   3e:	 b900000000           	mov	ecx, 0
 ;;   43:	 400f92c1             	setb	cl
-;;   47:	 4889c8               	mov	rax, rcx
-;;   4a:	 4883c418             	add	rsp, 0x18
-;;   4e:	 5d                   	pop	rbp
-;;   4f:	 c3                   	ret	
+;;   47:	 89c8                 	mov	eax, ecx
+;;   49:	 4883c418             	add	rsp, 0x18
+;;   4d:	 5d                   	pop	rbp
+;;   4e:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_lt_u/params.wat b/winch/filetests/filetests/x64/i64_lt_u/params.wat
index c0697c6614..a24abe412c 100644
--- a/winch/filetests/filetests/x64/i64_lt_u/params.wat
+++ b/winch/filetests/filetests/x64/i64_lt_u/params.wat
@@ -18,7 +18,7 @@
 ;;   20:	 4839c1               	cmp	rcx, rax
 ;;   23:	 b900000000           	mov	ecx, 0
 ;;   28:	 400f92c1             	setb	cl
-;;   2c:	 4889c8               	mov	rax, rcx
-;;   2f:	 4883c418             	add	rsp, 0x18
-;;   33:	 5d                   	pop	rbp
-;;   34:	 c3                   	ret	
+;;   2c:	 89c8                 	mov	eax, ecx
+;;   2e:	 4883c418             	add	rsp, 0x18
+;;   32:	 5d                   	pop	rbp
+;;   33:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_ne/locals.wat b/winch/filetests/filetests/x64/i64_ne/locals.wat
index 49090a56e9..23655ea637 100644
--- a/winch/filetests/filetests/x64/i64_ne/locals.wat
+++ b/winch/filetests/filetests/x64/i64_ne/locals.wat
@@ -32,7 +32,7 @@
 ;;   3b:	 4839c1               	cmp	rcx, rax
 ;;   3e:	 b900000000           	mov	ecx, 0
 ;;   43:	 400f95c1             	setne	cl
-;;   47:	 4889c8               	mov	rax, rcx
-;;   4a:	 4883c418             	add	rsp, 0x18
-;;   4e:	 5d                   	pop	rbp
-;;   4f:	 c3                   	ret	
+;;   47:	 89c8                 	mov	eax, ecx
+;;   49:	 4883c418             	add	rsp, 0x18
+;;   4d:	 5d                   	pop	rbp
+;;   4e:	 c3                   	ret	
diff --git a/winch/filetests/filetests/x64/i64_ne/params.wat b/winch/filetests/filetests/x64/i64_ne/params.wat
index 0d08508c8f..a77f746376 100644
--- a/winch/filetests/filetests/x64/i64_ne/params.wat
+++ b/winch/filetests/filetests/x64/i64_ne/params.wat
@@ -19,7 +19,7 @@
 ;;   20:	 4839c1               	cmp	rcx, rax
 ;;   23:	 b900000000           	mov	ecx, 0
 ;;   28:	 400f95c1             	setne	cl
-;;   2c:	 4889c8               	mov	rax, rcx
-;;   2f:	 4883c418             	add	rsp, 0x18
-;;   33:	 5d                   	pop	rbp
-;;   34:	 c3                   	ret	
+;;   2c:	 89c8                 	mov	eax, ecx
+;;   2e:	 4883c418             	add	rsp, 0x18
+;;   32:	 5d                   	pop	rbp
+;;   33:	 c3                   	ret