Remove the comisd instruction from the ia32 and x64 assemblers. We

should always use ucomisd.

Add missing pop from floating-point stack in case of allocation failure.
Review URL: http://codereview.chromium.org/2831009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4878 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/assembler-ia32.cc

@@ -2154,17 +2154,6 @@ void Assembler::sqrtsd(XMMRegister dst, XMMRegister src) {
 }
 
 
-void Assembler::comisd(XMMRegister dst, XMMRegister src) {
-  ASSERT(CpuFeatures::IsEnabled(SSE2));
-  EnsureSpace ensure_space(this);
-  last_pc_ = pc_;
-  EMIT(0x66);
-  EMIT(0x0F);
-  EMIT(0x2F);
-  emit_sse_operand(dst, src);
-}
-
-
 void Assembler::ucomisd(XMMRegister dst, XMMRegister src) {
   ASSERT(CpuFeatures::IsEnabled(SSE2));
   EnsureSpace ensure_space(this);

src/ia32/assembler-ia32.h

@@ -779,7 +779,6 @@ class Assembler : public Malloced {
   void xorpd(XMMRegister dst, XMMRegister src);
   void sqrtsd(XMMRegister dst, XMMRegister src);
 
-  void comisd(XMMRegister dst, XMMRegister src);
   void ucomisd(XMMRegister dst, XMMRegister src);
   void movmskpd(Register dst, XMMRegister src);
 

src/ia32/codegen-ia32.cc

@@ -604,6 +604,10 @@ void CodeGenerator::ConvertInt32ResultToNumber(Result* value) {
     RegisterFile empty_regs;
     SetFrame(clone, &empty_regs);
     __ bind(&allocation_failed);
+    if (!CpuFeatures::IsSupported(SSE2)) {
+      // Pop the value from the floating point stack.
+      __ fstp(0);
+    }
     unsafe_bailout_->Jump();
 
     done.Bind(value);
@@ -2991,7 +2995,7 @@ void CodeGenerator::GenerateInlineNumberComparison(Result* left_side,
                               &not_numbers);
     LoadComparisonOperandSSE2(masm_, right_side, xmm1, left_side, right_side,
                               &not_numbers);
-    __ comisd(xmm0, xmm1);
+    __ ucomisd(xmm0, xmm1);
   } else {
     Label check_right, compare;
 
@@ -7306,7 +7310,7 @@ void CodeGenerator::GenerateMathPow(ZoneList<Expression*>* args) {
     // Since xmm3 is 1 and xmm2 is -0.5 this is simply xmm2 + xmm3.
     __ addsd(xmm2, xmm3);
     // xmm2 now has 0.5.
-    __ comisd(xmm2, xmm1);
+    __ ucomisd(xmm2, xmm1);
     call_runtime.Branch(not_equal);
     // Calculates square root.
     __ movsd(xmm1, xmm0);
@@ -11592,7 +11596,7 @@ void NumberToStringStub::GenerateLookupNumberStringCache(MacroAssembler* masm,
       CpuFeatures::Scope fscope(SSE2);
       __ movdbl(xmm0, FieldOperand(object, HeapNumber::kValueOffset));
       __ movdbl(xmm1, FieldOperand(probe, HeapNumber::kValueOffset));
-      __ comisd(xmm0, xmm1);
+      __ ucomisd(xmm0, xmm1);
     } else {
       __ fld_d(FieldOperand(object, HeapNumber::kValueOffset));
       __ fld_d(FieldOperand(probe, HeapNumber::kValueOffset));
@@ -11817,7 +11821,7 @@ void CompareStub::Generate(MacroAssembler* masm) {
       CpuFeatures::Scope use_cmov(CMOV);
 
       FloatingPointHelper::LoadSSE2Operands(masm, &non_number_comparison);
-      __ comisd(xmm0, xmm1);
+      __ ucomisd(xmm0, xmm1);
 
       // Don't base result on EFLAGS when a NaN is involved.
       __ j(parity_even, &unordered, not_taken);

src/x64/assembler-x64.cc

@@ -2738,17 +2738,6 @@ void Assembler::sqrtsd(XMMRegister dst, XMMRegister src) {
 }
 
 
-void Assembler::comisd(XMMRegister dst, XMMRegister src) {
-  EnsureSpace ensure_space(this);
-  last_pc_ = pc_;
-  emit(0x66);
-  emit_optional_rex_32(dst, src);
-  emit(0x0f);
-  emit(0x2f);
-  emit_sse_operand(dst, src);
-}
-
-
 void Assembler::ucomisd(XMMRegister dst, XMMRegister src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;

src/x64/assembler-x64.h

@@ -1122,7 +1122,6 @@ class Assembler : public Malloced {
   void xorpd(XMMRegister dst, XMMRegister src);
   void sqrtsd(XMMRegister dst, XMMRegister src);
 
-  void comisd(XMMRegister dst, XMMRegister src);
   void ucomisd(XMMRegister dst, XMMRegister src);
 
   // The first argument is the reg field, the second argument is the r/m field.

src/x64/codegen-x64.cc

@@ -4429,7 +4429,7 @@ void CodeGenerator::GenerateMathPow(ZoneList<Expression*>* args) {
   // Since xmm3 is 1 and xmm2 is -0.5 this is simply xmm2 + xmm3.
   __ addsd(xmm2, xmm3);
   // xmm2 now has 0.5.
-  __ comisd(xmm2, xmm1);
+  __ ucomisd(xmm2, xmm1);
   call_runtime.Branch(not_equal);
 
   // Calculates square root.
@@ -6512,7 +6512,7 @@ void CodeGenerator::GenerateInlineNumberComparison(Result* left_side,
                         &not_numbers);
   LoadComparisonOperand(masm_, right_side, xmm1, left_side, right_side,
                         &not_numbers);
-  __ comisd(xmm0, xmm1);
+  __ ucomisd(xmm0, xmm1);
   // Bail out if a NaN is involved.
   not_numbers.Branch(parity_even, left_side, right_side);
 
@@ -8909,7 +8909,7 @@ void NumberToStringStub::GenerateLookupNumberStringCache(MacroAssembler* masm,
     CpuFeatures::Scope fscope(SSE2);
     __ movsd(xmm0, FieldOperand(object, HeapNumber::kValueOffset));
     __ movsd(xmm1, FieldOperand(probe, HeapNumber::kValueOffset));
-    __ comisd(xmm0, xmm1);
+    __ ucomisd(xmm0, xmm1);
     __ j(parity_even, not_found);  // Bail out if NaN is involved.
     __ j(not_equal, not_found);  // The cache did not contain this value.
     __ jmp(&load_result_from_cache);
@@ -9116,7 +9116,7 @@ void CompareStub::Generate(MacroAssembler* masm) {
     FloatingPointHelper::LoadFloatOperand(masm, rax, xmm1,
                                           &non_number_comparison);
 
-    __ comisd(xmm0, xmm1);
+    __ ucomisd(xmm0, xmm1);
 
     // Don't base result on EFLAGS when a NaN is involved.
     __ j(parity_even, &unordered);

test/cctest/test-disasm-ia32.cc

@@ -375,7 +375,7 @@ TEST(DisasmIa320) {
       __ divsd(xmm1, xmm0);
       __ movdbl(xmm1, Operand(ebx, ecx, times_4, 10000));
       __ movdbl(Operand(ebx, ecx, times_4, 10000), xmm1);
-      __ comisd(xmm0, xmm1);
+      __ ucomisd(xmm0, xmm1);
 
       // 128 bit move instructions.
       __ movdqa(xmm0, Operand(ebx, ecx, times_4, 10000));