[builtins] Remove extra move in ResumeGeneratorTrampoline

Change-Id: I824a671c54c92975a94f9dc56e993d532f022ce6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2874401Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74406}

src/builtins/arm/builtins-arm.cc

@@ -389,16 +389,13 @@ void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
          FieldMemOperand(r1, JSGeneratorObject::kParametersAndRegistersOffset));
   {
     Label done_loop, loop;
-    __ mov(r6, r3);
-
     __ bind(&loop);
-    __ sub(r6, r6, Operand(1), SetCC);
+    __ sub(r3, r3, Operand(1), SetCC);
     __ b(lt, &done_loop);
-    __ add(scratch, r2, Operand(r6, LSL, kTaggedSizeLog2));
+    __ add(scratch, r2, Operand(r3, LSL, kTaggedSizeLog2));
     __ ldr(scratch, FieldMemOperand(scratch, FixedArray::kHeaderSize));
     __ Push(scratch);
     __ b(&loop);
-
     __ bind(&done_loop);
 
     // Push receiver.

src/builtins/ia32/builtins-ia32.cc

@@ -646,15 +646,12 @@ void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
            FieldOperand(edx, JSGeneratorObject::kParametersAndRegistersOffset));
     {
       Label done_loop, loop;
-      __ mov(edi, ecx);
-
       __ bind(&loop);
-      __ dec(edi);
+      __ dec(ecx);
       __ j(less, &done_loop);
       __ Push(
-          FieldOperand(ebx, edi, times_tagged_size, FixedArray::kHeaderSize));
+          FieldOperand(ebx, ecx, times_tagged_size, FixedArray::kHeaderSize));
       __ jmp(&loop);
-
       __ bind(&done_loop);
     }
 

src/builtins/x64/builtins-x64.cc

@@ -742,20 +742,15 @@ void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
       rbx, FieldOperand(rdx, JSGeneratorObject::kParametersAndRegistersOffset));
 
   {
-    {
-      Label done_loop, loop;
-      __ movq(r9, rcx);
-
-      __ bind(&loop);
-      __ decq(r9);
-      __ j(less, &done_loop, Label::kNear);
-      __ PushTaggedAnyField(
-          FieldOperand(rbx, r9, times_tagged_size, FixedArray::kHeaderSize),
-          decompr_scratch1);
-      __ jmp(&loop);
-
-      __ bind(&done_loop);
-    }
+    Label done_loop, loop;
+    __ bind(&loop);
+    __ decq(rcx);
+    __ j(less, &done_loop, Label::kNear);
+    __ PushTaggedAnyField(
+        FieldOperand(rbx, rcx, times_tagged_size, FixedArray::kHeaderSize),
+        decompr_scratch1);
+    __ jmp(&loop);
+    __ bind(&done_loop);
 
     // Push the receiver.
     __ PushTaggedPointerField(