Porting Math.pow changes to x64.

src/ia32/lithium-codegen-ia32.cc

 // Copyright 2011 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 2973 matching lines @@
   __ xorps(xmm_scratch, xmm_scratch);
   __ addsd(input_reg, xmm_scratch);  // Convert -0 to +0.
   __ sqrtsd(input_reg, input_reg);
   __ 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 registers are the expected ones.
+  // Just make sure that the input/output registers are the expected ones.
   ASSERT(!instr->InputAt(1)->IsDoubleRegister() ||

[ulan, 2011/12/06 17:38:04]

Don't forget to change the assertions to reflect register changes.

          ToDoubleRegister(instr->InputAt(1)).is(xmm2));
   ASSERT(!instr->InputAt(1)->IsRegister() ||
          ToRegister(instr->InputAt(1)).is(eax));
   ASSERT(ToDoubleRegister(instr->InputAt(0)).is(xmm1));
   ASSERT(ToDoubleRegister(instr->result()).is(xmm3));
 
   if (exponent_type.IsTagged()) {
     Label no_deopt;
     __ JumpIfSmi(eax, &no_deopt);
     __ CmpObjectType(eax, HEAP_NUMBER_TYPE, ecx);
@@ skipping 1615 matching lines @@
       this, pointers, Safepoint::kLazyDeopt);
   __ InvokeBuiltin(Builtins::IN, CALL_FUNCTION, safepoint_generator);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32