[X87] [crankshaft] Set Floating-point precision in Math.Cos/Math.Sin to standard double precision.

src/crankshaft/x87/lithium-codegen-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.
 
 #if V8_TARGET_ARCH_X87
 
 #include "src/crankshaft/x87/lithium-codegen-x87.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 3642 matching lines @@
 
 void LCodeGen::DoMathCos(LMathCos* instr) {
   X87Register result = ToX87Register(instr->result());
   X87Register input_reg = ToX87Register(instr->value());
   __ fld(x87_stack_.st(input_reg));
 
   // Pass one double as argument on the stack.
   __ PrepareCallCFunction(2, eax);
   __ fstp_d(MemOperand(esp, 0));
   X87PrepareToWrite(result);
+  __ X87SetFPUCW(0x027F);
   __ CallCFunction(ExternalReference::ieee754_cos_function(isolate()), 2);
+  __ X87SetFPUCW(0x037F);
   // Return value is in st(0) on ia32.
   X87CommitWrite(result);
 }
 
 void LCodeGen::DoMathSin(LMathSin* instr) {
   X87Register result = ToX87Register(instr->result());
   X87Register input_reg = ToX87Register(instr->value());
   __ fld(x87_stack_.st(input_reg));
 
   // Pass one double as argument on the stack.
   __ PrepareCallCFunction(2, eax);
   __ fstp_d(MemOperand(esp, 0));
   X87PrepareToWrite(result);
+  __ X87SetFPUCW(0x027F);
   __ CallCFunction(ExternalReference::ieee754_sin_function(isolate()), 2);
+  __ X87SetFPUCW(0x037F);
   // Return value is in st(0) on ia32.
   X87CommitWrite(result);
 }
 
 void LCodeGen::DoMathExp(LMathExp* instr) {
   X87Register result = ToX87Register(instr->result());
   X87Register input_reg = ToX87Register(instr->value());
   __ fld(x87_stack_.st(input_reg));
 
   // Pass one double as argument on the stack.
@@ skipping 2012 matching lines @@
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87