[x64] Make xmm0 allocatable and use xmm15 as scratch register instead.

src/crankshaft/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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/crankshaft/x64/lithium-codegen-x64.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 1869 matching lines @@
         __ vdivsd(result, left, right);
       } else {
         DCHECK(result.is(left));
         __ divsd(left, right);
       }
       // Don't delete this mov. It may improve performance on some CPUs,
       // when there is a (v)mulsd depending on the result
       __ Movapd(result, result);
       break;
     case Token::MOD: {
-      XMMRegister xmm_scratch = double_scratch0();
+      DCHECK(left.is(xmm0));
+      DCHECK(right.is(xmm1));
+      DCHECK(result.is(xmm0));
       __ PrepareCallCFunction(2);
-      __ Movapd(xmm_scratch, left);
-      DCHECK(right.is(xmm1));
       __ CallCFunction(
           ExternalReference::mod_two_doubles_operation(isolate()), 2);
-      __ Movapd(result, xmm_scratch);
       break;
     }
     default:
       UNREACHABLE();
       break;
   }
 }
 
 
 void LCodeGen::DoArithmeticT(LArithmeticT* instr) {
@@ skipping 2854 matching lines @@
     __ Set(input_reg, 1);
     __ jmp(done);
 
     __ bind(&check_false);
     __ CompareRoot(input_reg, Heap::kFalseValueRootIndex);
     DeoptimizeIf(not_equal, instr,
                  Deoptimizer::kNotAHeapNumberUndefinedBoolean);
     __ Set(input_reg, 0);
   } else {
     XMMRegister scratch = ToDoubleRegister(instr->temp());
-    DCHECK(!scratch.is(xmm0));
+    DCHECK(!scratch.is(double_scratch0()));
     __ CompareRoot(FieldOperand(input_reg, HeapObject::kMapOffset),
                    Heap::kHeapNumberMapRootIndex);
     DeoptimizeIf(not_equal, instr, Deoptimizer::kNotAHeapNumber);
-    __ Movsd(xmm0, FieldOperand(input_reg, HeapNumber::kValueOffset));
-    __ Cvttsd2si(input_reg, xmm0);
+    __ Movsd(double_scratch0(),
+             FieldOperand(input_reg, HeapNumber::kValueOffset));
+    __ Cvttsd2si(input_reg, double_scratch0());
     __ Cvtlsi2sd(scratch, input_reg);
-    __ Ucomisd(xmm0, scratch);
+    __ Ucomisd(double_scratch0(), scratch);
     DeoptimizeIf(not_equal, instr, Deoptimizer::kLostPrecision);
     DeoptimizeIf(parity_even, instr, Deoptimizer::kNaN);
     if (instr->hydrogen()->GetMinusZeroMode() == FAIL_ON_MINUS_ZERO) {
       __ testl(input_reg, input_reg);
       __ j(not_zero, done);
-      __ Movmskpd(input_reg, xmm0);
+      __ Movmskpd(input_reg, double_scratch0());
       __ andl(input_reg, Immediate(1));
       DeoptimizeIf(not_zero, instr, Deoptimizer::kMinusZero);
     }
   }
 }
 
 
 void LCodeGen::DoTaggedToI(LTaggedToI* instr) {
   class DeferredTaggedToI final : public LDeferredCode {
    public:
@@ skipping 819 matching lines @@
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64