Set the FPU precision control to double-precision.

src/x87/macro-assembler-x87.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/v8.h"
 
 #if V8_TARGET_ARCH_X87
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 749 matching lines @@
 void MacroAssembler::X87SetRC(int rc) {
   sub(esp, Immediate(kPointerSize));
   fnstcw(MemOperand(esp, 0));
   and_(MemOperand(esp, 0), Immediate(0xF3FF));
   or_(MemOperand(esp, 0), Immediate(rc));
   fldcw(MemOperand(esp, 0));
   add(esp, Immediate(kPointerSize));
 }
 
 
+void MacroAssembler::X87SetFPUCW(int cw) {
+  push(Immediate(cw));
+  fldcw(MemOperand(esp, 0));
+  add(esp, Immediate(kPointerSize));
+}
+
+
 void MacroAssembler::AssertNumber(Register object) {
   if (emit_debug_code()) {
     Label ok;
     JumpIfSmi(object, &ok);
     cmp(FieldOperand(object, HeapObject::kMapOffset),
         isolate()->factory()->heap_number_map());
     Check(equal, kOperandNotANumber);
     bind(&ok);
   }
 }
@@ skipping 2575 matching lines @@
   if (mag.shift > 0) sar(edx, mag.shift);
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X87