Relax register constraints for LMathSqrt.

src/x64/lithium-codegen-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "x64/lithium-codegen-x64.h"
 #include "code-stubs.h"
@@ skipping 3707 matching lines @@
     __ testq(output_reg, output_reg);
     __ RecordComment("Minus zero");
     DeoptimizeIf(negative, instr->environment());
   }
   __ Set(output_reg, 0);
   __ bind(&done);
 }
 
 
 void LCodeGen::DoMathSqrt(LMathSqrt* instr) {
-  XMMRegister input_reg = ToDoubleRegister(instr->value());
-  ASSERT(ToDoubleRegister(instr->result()).is(input_reg));
-  __ sqrtsd(input_reg, input_reg);
+  XMMRegister output = ToDoubleRegister(instr->result());
+  if (instr->value()->IsDoubleRegister()) {
+    XMMRegister input = ToDoubleRegister(instr->value());
+    __ sqrtsd(output, input);
+  } else {
+    Operand input = ToOperand(instr->value());
+    __ sqrtsd(output, input);
+  }
 }
 
 
 void LCodeGen::DoMathPowHalf(LMathPowHalf* instr) {
   XMMRegister xmm_scratch = double_scratch0();
   XMMRegister input_reg = ToDoubleRegister(instr->value());
   ASSERT(ToDoubleRegister(instr->result()).is(input_reg));
 
   // Note that according to ECMA-262 15.8.2.13:
   // Math.pow(-Infinity, 0.5) == Infinity
@@ skipping 1965 matching lines @@
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64