Quickfix for DoMathPowHalf.

src/ia32/code-stubs-ia32.cc

 // Copyright 2011 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 2985 matching lines @@
       // Fall through intended
     case INTEGER:
       // xmm1: base as double
       // eax: exponent as untagged integer
     case DOUBLE:
       // xmm1: base as double
       // xmm2: exponent as double
       // Check base in xmm1 for NaN or +/-Infinity
       const int kExponentShift = kBitsPerByte *
           (HeapNumber::kExponentOffset - HeapNumber::kMantissaOffset);
-      if (CpuFeatures::IsSupported(SSE4_1)) {
-        __ extractps(ecx, xmm1, kExponentShift);
-      } else {
-        __ movsd(xmm4, xmm1);
-        __ psrlq(xmm4, kExponentShift);
-        __ movd(ecx, xmm4);
-      }
+      __ movsd(xmm4, xmm1);
+      __ psrlq(xmm4, kExponentShift);
+      __ movd(ecx, xmm4);
       __ and_(ecx, HeapNumber::kExponentMask);
       __ cmp(ecx, Immediate(HeapNumber::kExponentMask));
       __ j(equal, &generic_runtime);
       break;
   }
 
   if (exponent_type_ != INTEGER) {
     Label not_minus_half, fast_power;
     // xmm1: base as double that is not +/- Infinity or NaN
     // xmm2: exponent as double
@@ skipping 4255 matching lines @@
                                  false);
   __ pop(edx);
   __ ret(0);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32