Get rid of x87 in ia32 LCodeGen::DoBranch

src/ia32/lithium-codegen-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2068 matching lines @@
         __ jmp(false_label);
         __ bind(&not_string);
       }
 
       if (expected.Contains(ToBooleanStub::HEAP_NUMBER)) {
         // heap number -> false iff +0, -0, or NaN.
         Label not_heap_number;
         __ cmp(FieldOperand(reg, HeapObject::kMapOffset),
                factory()->heap_number_map());
         __ j(not_equal, &not_heap_number, Label::kNear);
-        __ fldz();
-        __ fld_d(FieldOperand(reg, HeapNumber::kValueOffset));
-        __ FCmp();
+        __ xorps(xmm0, xmm0);
+        __ ucomisd(xmm0, FieldOperand(reg, HeapNumber::kValueOffset));
         __ j(zero, false_label);
         __ jmp(true_label);
         __ bind(&not_heap_number);
       }
 
       // We've seen something for the first time -> deopt.
       DeoptimizeIf(no_condition, instr->environment());
     }
   }
 }
@@ skipping 4076 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32