Use xorps to break the cvtsi2sd unnecessary dependence due to its partially written

src/x64/macro-assembler-x64.cc

 // Copyright 2012 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 918 matching lines @@
   }
   for (int i = kNumberOfSavedRegs - 1; i >= 0; i--) {
     Register reg = saved_regs[i];
     if (!reg.is(exclusion1) && !reg.is(exclusion2) && !reg.is(exclusion3)) {
       pop(reg);
     }
   }
 }
 
 
+void MacroAssembler::Cvtlsi2sd(XMMRegister dst, Register src) {
+  xorps(dst, dst);
+  cvtlsi2sd(dst, src);
+}
+
+
+void MacroAssembler::Cvtlsi2sd(XMMRegister dst, const Operand& src) {
+  xorps(dst, dst);
+  cvtlsi2sd(dst, src);
+}
+
+
 void MacroAssembler::Set(Register dst, int64_t x) {
   if (x == 0) {
     xorl(dst, dst);
   } else if (is_uint32(x)) {
     movl(dst, Immediate(static_cast<uint32_t>(x)));
   } else if (is_int32(x)) {
     movq(dst, Immediate(static_cast<int32_t>(x)));
   } else {
     movq(dst, x, RelocInfo::NONE64);
   }
@@ skipping 1961 matching lines @@
   // the double array.
   Set(kScratchRegister, BitCast<uint64_t>(
       FixedDoubleArray::canonical_not_the_hole_nan_as_double()));
   movq(xmm_scratch, kScratchRegister);
   jmp(&have_double_value, Label::kNear);
 
   bind(&smi_value);
   // Value is a smi. convert to a double and store.
   // Preserve original value.
   SmiToInteger32(kScratchRegister, maybe_number);
-  cvtlsi2sd(xmm_scratch, kScratchRegister);
+  Cvtlsi2sd(xmm_scratch, kScratchRegister);
   movsd(FieldOperand(elements, index, times_8,
                      FixedDoubleArray::kHeaderSize - elements_offset),
         xmm_scratch);
   bind(&done);
 }
 
 
 void MacroAssembler::CompareMap(Register obj,
                                 Handle<Map> map,
                                 Label* early_success) {
@@ skipping 112 matching lines @@
 }
 
 
 void MacroAssembler::DoubleToI(Register result_reg,
                                XMMRegister input_reg,
                                XMMRegister scratch,
                                MinusZeroMode minus_zero_mode,
                                Label* conversion_failed,
                                Label::Distance dst) {
   cvttsd2si(result_reg, input_reg);
-  cvtlsi2sd(xmm0, result_reg);
+  Cvtlsi2sd(xmm0, result_reg);
   ucomisd(xmm0, input_reg);
   j(not_equal, conversion_failed, dst);
   j(parity_even, conversion_failed, dst);  // NaN.
   if (minus_zero_mode == FAIL_ON_MINUS_ZERO) {
     Label done;
     // The integer converted back is equal to the original. We
     // only have to test if we got -0 as an input.
     testl(result_reg, result_reg);
     j(not_zero, &done, Label::kNear);
     movmskpd(result_reg, input_reg);
@@ skipping 16 matching lines @@
   Label done;
   ASSERT(!temp.is(xmm0));
 
   // Heap number map check.
   CompareRoot(FieldOperand(input_reg, HeapObject::kMapOffset),
               Heap::kHeapNumberMapRootIndex);
   j(not_equal, lost_precision, dst);
 
   movsd(xmm0, FieldOperand(input_reg, HeapNumber::kValueOffset));
   cvttsd2si(result_reg, xmm0);
-  cvtlsi2sd(temp, result_reg);
+  Cvtlsi2sd(temp, result_reg);
   ucomisd(xmm0, temp);
   RecordComment("Deferred TaggedToI: lost precision");
   j(not_equal, lost_precision, dst);
   RecordComment("Deferred TaggedToI: NaN");
   j(parity_even, lost_precision, dst);  // NaN.
   if (minus_zero_mode == FAIL_ON_MINUS_ZERO) {
     testl(result_reg, result_reg);
     j(not_zero, &done, Label::kNear);
     movmskpd(result_reg, xmm0);
     andl(result_reg, Immediate(1));
@@ skipping 1706 matching lines @@
   j(greater, &no_memento_available);
   CompareRoot(MemOperand(scratch_reg, -AllocationMemento::kSize),
               Heap::kAllocationMementoMapRootIndex);
   bind(&no_memento_available);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64