A64: Move integer exponent into correct register before calling MathPowStub.

src/a64/lithium-codegen-a64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3749 matching lines @@
   __ Bind(&done);
 }
 
 
 void LCodeGen::DoPower(LPower* instr) {
   Representation exponent_type = instr->hydrogen()->right()->representation();
   // Having marked this as a call, we can use any registers.
   // Just make sure that the input/output registers are the expected ones.
   ASSERT(!instr->right()->IsDoubleRegister() ||
          ToDoubleRegister(instr->right()).is(d1));
-  ASSERT(!instr->right()->IsRegister() ||
+  ASSERT(exponent_type.IsInteger32() || !instr->right()->IsRegister() ||
          ToRegister(instr->right()).is(x11));
+  ASSERT(!exponent_type.IsInteger32() || ToRegister(instr->right()).is(x12));
   ASSERT(ToDoubleRegister(instr->left()).is(d0));
   ASSERT(ToDoubleRegister(instr->result()).is(d0));
 
   if (exponent_type.IsSmi()) {
     MathPowStub stub(MathPowStub::TAGGED);
     __ CallStub(&stub);
   } else if (exponent_type.IsTagged()) {
     Label no_deopt;
     __ JumpIfSmi(x11, &no_deopt);
     __ Ldr(x0, FieldMemOperand(x11, HeapObject::kMapOffset));
@@ skipping 1677 matching lines @@
   __ Bind(&out_of_object);
   __ Ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(&done);
 }
 
 } }  // namespace v8::internal