[turbofan] Implemented the TruncateFloat32ToInt64 TurboFan operator.

src/x64/macro-assembler-x64.cc

 // Copyright 2012 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/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 949 matching lines @@
 void MacroAssembler::Cvttsd2si(Register dst, const Operand& src) {
   if (CpuFeatures::IsSupported(AVX)) {
     CpuFeatureScope scope(this, AVX);
     vcvttsd2si(dst, src);
   } else {
     cvttsd2si(dst, src);
   }
 }
 
 
+void MacroAssembler::Cvttss2siq(Register dst, XMMRegister src) {
+  if (CpuFeatures::IsSupported(AVX)) {
+    CpuFeatureScope scope(this, AVX);
+    vcvttss2siq(dst, src);
+  } else {
+    cvttss2siq(dst, src);
+  }
+}
+
+
+void MacroAssembler::Cvttss2siq(Register dst, const Operand& src) {
+  if (CpuFeatures::IsSupported(AVX)) {
+    CpuFeatureScope scope(this, AVX);
+    vcvttss2siq(dst, src);
+  } else {
+    cvttss2siq(dst, src);
+  }
+}
+
+
 void MacroAssembler::Cvttsd2siq(Register dst, XMMRegister src) {
   if (CpuFeatures::IsSupported(AVX)) {
     CpuFeatureScope scope(this, AVX);
     vcvttsd2siq(dst, src);
   } else {
     cvttsd2siq(dst, src);
   }
 }
 
 
@@ skipping 4544 matching lines @@
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64