X87: Fix the bug in CompareIC_GenerateNumber

src/x87/code-stubs-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/bootstrapper.h"
@@ skipping 3240 matching lines @@
   __ ret(0);
 
   __ bind(&miss);
   GenerateMiss(masm);
 }
 
 
 void CompareICStub::GenerateNumbers(MacroAssembler* masm) {
   DCHECK(state() == CompareICState::NUMBER);
 
-  Label generic_stub;
+  Label generic_stub, check_left;
   Label unordered, maybe_undefined1, maybe_undefined2;
   Label miss;
 
   if (left() == CompareICState::SMI) {
     __ JumpIfNotSmi(edx, &miss);
   }
   if (right() == CompareICState::SMI) {
     __ JumpIfNotSmi(eax, &miss);
   }
 
   // Inlining the double comparison and falling back to the general compare
   // stub if NaN is involved or SSE2 or CMOV is unsupported.
-  __ mov(ecx, edx);
-  __ and_(ecx, eax);
-  __ JumpIfSmi(ecx, &generic_stub, Label::kNear);
-
+  __ JumpIfSmi(eax, &check_left, Label::kNear);
   __ cmp(FieldOperand(eax, HeapObject::kMapOffset),
          isolate()->factory()->heap_number_map());
   __ j(not_equal, &maybe_undefined1, Label::kNear);
+
+  __ bind(&check_left);
+  __ JumpIfSmi(edx, &generic_stub, Label::kNear);
   __ cmp(FieldOperand(edx, HeapObject::kMapOffset),
          isolate()->factory()->heap_number_map());
   __ j(not_equal, &maybe_undefined2, Label::kNear);
 
   __ bind(&unordered);
   __ bind(&generic_stub);
   CompareICStub stub(isolate(), op(), CompareICState::GENERIC,
                      CompareICState::GENERIC, CompareICState::GENERIC);
   __ jmp(stub.GetCode(), RelocInfo::CODE_TARGET);
 
@@ skipping 1772 matching lines @@
                            ApiParameterOperand(2), kStackSpace, nullptr,
                            Operand(ebp, 7 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X87