Fix bug that errnoeously sets FPU exception.

This has only been caught on Win64 yet.

Review URL: http://codereview.chromium.org/201106


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2881 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/macro-assembler-ia32.cc

@@ -319,7 +319,7 @@ void MacroAssembler::CmpInstanceType(Register map, InstanceType type) {
 
 
 void MacroAssembler::FCmp() {
-  fcompp();
+  fucompp();
   push(eax);
   fnstsw_ax();
   sahf();

src/runtime.cc

@@ -3696,7 +3696,7 @@ static Object* Runtime_NumberMod(Arguments args) {
   CONVERT_DOUBLE_CHECKED(x, args[0]);
   CONVERT_DOUBLE_CHECKED(y, args[1]);
 
-#ifdef WIN32
+#if defined WIN32 || defined _WIN64
   // Workaround MS fmod bugs. ECMA-262 says:
   // dividend is finite and divisor is an infinity => result equals dividend
   // dividend is a zero and divisor is nonzero finite => result equals dividend

src/x64/macro-assembler-x64.cc

@@ -1280,7 +1280,7 @@ void MacroAssembler::Ret() {
 
 
 void MacroAssembler::FCmp() {
-  fcompp();
+  fucompp();
   push(rax);
   fnstsw_ax();
   if (CpuFeatures::IsSupported(CpuFeatures::SAHF)) {