Quickfix for DoMathPowHalf.

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 2920 matching lines @@
   XMMRegister input_reg = ToDoubleRegister(instr->value());
   ASSERT(ToDoubleRegister(instr->result()).is(input_reg));
   __ sqrtsd(input_reg, input_reg);
 }
 
 
 void LCodeGen::DoMathPowHalf(LUnaryMathOperation* instr) {
   XMMRegister xmm_scratch = xmm0;
   XMMRegister input_reg = ToDoubleRegister(instr->value());
   ASSERT(ToDoubleRegister(instr->result()).is(input_reg));
+
+  Label return_infinity, done;
+  // Check base for +/- infinity.
+  __ push(ecx);

[Erik Corry, 2011/12/02 13:11:02]

This is nasty.  We have support for allocating temporary registers in Lithium,
so we don't need to push and pop if we have registers.

+  __ mov(ecx, factory()->infinity_value());
+  __ ucomisd(input_reg, FieldOperand(ecx, HeapNumber::kValueOffset));
+  __ j(equal, &return_infinity, Label::kNear);
+  __ xorps(xmm_scratch, xmm_scratch);
+  __ subsd(xmm_scratch, input_reg);
+  __ ucomisd(xmm_scratch, FieldOperand(ecx, HeapNumber::kValueOffset));
+  __ j(equal, &return_infinity, Label::kNear);
+
+  __ pop(ecx);
   __ xorps(xmm_scratch, xmm_scratch);
   __ addsd(input_reg, xmm_scratch);  // Convert -0 to +0.
   __ sqrtsd(input_reg, input_reg);
+  __ jmp(&done, Label::kNear);
+
+  __ bind(&return_infinity);
+  __ movdbl(input_reg, FieldOperand(ecx, HeapNumber::kValueOffset));
+  __ pop(ecx);
+  __ 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.
   ASSERT(!instr->InputAt(1)->IsDoubleRegister() ||
          ToDoubleRegister(instr->InputAt(1)).is(xmm2));
   ASSERT(!instr->InputAt(1)->IsRegister() ||
@@ skipping 1646 matching lines @@
       this, pointers, Safepoint::kLazyDeopt);
   __ InvokeBuiltin(Builtins::IN, CALL_FUNCTION, safepoint_generator);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32