PPC/s390: Use r0 for SmiTag and Compare

Change-Id: Icd452df211c85d83c82812124d14fe6a31e733b7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2509553Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#70902}

src/builtins/ppc/builtins-ppc.cc

@@ -1170,8 +1170,8 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
   // Perform interrupt stack check.
   // TODO(solanes): Merge with the real stack limit check above.
   Label stack_check_interrupt, after_stack_check_interrupt;
-  LoadStackLimit(masm, r6, StackLimitKind::kInterruptStackLimit);
-  __ cmpl(sp, r6);
+  LoadStackLimit(masm, r0, StackLimitKind::kInterruptStackLimit);
+  __ cmpl(sp, r0);
   __ blt(&stack_check_interrupt);
   __ bind(&after_stack_check_interrupt);
 
@@ -1236,8 +1236,8 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
          Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
   __ LoadRoot(kInterpreterAccumulatorRegister, RootIndex::kUndefinedValue);
 
-  __ SmiTag(r6, kInterpreterBytecodeOffsetRegister);
-  __ StoreP(r6,
+  __ SmiTag(r0, kInterpreterBytecodeOffsetRegister);
+  __ StoreP(r0,
             MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
 
   __ jmp(&after_stack_check_interrupt);

src/builtins/s390/builtins-s390.cc

@@ -1208,7 +1208,7 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
   }
 
   // If the bytecode array has a valid incoming new target or generator object
-  // register, initialize it with incoming value which was passed in r6.
+  // register, initialize it with incoming value which was passed in r5.
   Label no_incoming_new_target_or_generator_register;
   __ LoadW(r8, FieldMemOperand(
                    kInterpreterBytecodeArrayRegister,
@@ -1222,9 +1222,9 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
   // Perform interrupt stack check.
   // TODO(solanes): Merge with the real stack limit check above.
   Label stack_check_interrupt, after_stack_check_interrupt;
-  __ LoadP(r5,
+  __ LoadP(r0,
            StackLimitAsMemOperand(masm, StackLimitKind::kInterruptStackLimit));
-  __ CmpLogicalP(sp, r5);
+  __ CmpLogicalP(sp, r0);
   __ blt(&stack_check_interrupt);
   __ bind(&after_stack_check_interrupt);
 
@@ -1290,8 +1290,8 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
          Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
   __ LoadRoot(kInterpreterAccumulatorRegister, RootIndex::kUndefinedValue);
 
-  __ SmiTag(r5, kInterpreterBytecodeOffsetRegister);
-  __ StoreP(r5,
+  __ SmiTag(r0, kInterpreterBytecodeOffsetRegister);
+  __ StoreP(r0,
             MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
 
   __ jmp(&after_stack_check_interrupt);