[turbofan] Implemented the TruncateFloat32ToInt64 TurboFan operator.

src/x64/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.
 
 #include "src/x64/assembler-x64.h"
 
 #include <cstring>
 
 #if V8_TARGET_ARCH_X64
 
@@ skipping 3094 matching lines @@
   DCHECK(!IsEnabled(AVX));
   EnsureSpace ensure_space(this);
   emit(0xF2);
   emit_optional_rex_32(dst, src);
   emit(0x0F);
   emit(0x2C);
   emit_sse_operand(dst, src);
 }
 
 
+void Assembler::cvttss2siq(Register dst, XMMRegister src) {
+  DCHECK(!IsEnabled(AVX));
+  EnsureSpace ensure_space(this);
+  emit(0xF3);
+  emit_rex_64(dst, src);
+  emit(0x0F);
+  emit(0x2C);
+  emit_sse_operand(dst, src);
+}
+
+
+void Assembler::cvttss2siq(Register dst, const Operand& src) {
+  DCHECK(!IsEnabled(AVX));
+  EnsureSpace ensure_space(this);
+  emit(0xF3);
+  emit_rex_64(dst, src);
+  emit(0x0F);
+  emit(0x2C);
+  emit_sse_operand(dst, src);
+}
+
+
 void Assembler::cvttsd2siq(Register dst, XMMRegister src) {
   DCHECK(!IsEnabled(AVX));
   EnsureSpace ensure_space(this);
   emit(0xF2);
   emit_rex_64(dst, src);
   emit(0x0F);
   emit(0x2C);
   emit_sse_operand(dst, src);
 }
 
@@ skipping 990 matching lines @@
 
 bool RelocInfo::IsInConstantPool() {
   return false;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64