Merge 106864 - zvmul incorrectly multiplies complex arrays on Windows.

Source/WebCore/platform/audio/VectorMath.cpp

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 400 matching lines @@
             real = _mm_sub_ps(real, _mm_mul_ps(imag1, imag2));
             __m128 imag = _mm_mul_ps(real1, imag2);
             imag = _mm_add_ps(imag, _mm_mul_ps(imag1, real2));
             _mm_store_ps(realDestP + i, real);
             _mm_store_ps(imagDestP + i, imag);
             i += 4;
         }
     }
 #endif
     for (; i < framesToProcess; ++i) {
-        realDestP[i] = real1P[i] * real2P[i] - imag1P[i] * imag2P[i];
-        imagDestP[i] = real1P[i] * imag2P[i] + imag1P[i] * real2P[i];
+        // Read and compute result before storing them, in case the
+        // destination is the same as one of the sources.
+        float realResult = real1P[i] * real2P[i] - imag1P[i] * imag2P[i];
+        float imagResult = real1P[i] * imag2P[i] + imag1P[i] * real2P[i];
+
+        realDestP[i] = realResult;
+        imagDestP[i] = imagResult;
     }
 }
 
 void vsvesq(const float* sourceP, int sourceStride, float* sumP, size_t framesToProcess)
 {
     // FIXME: optimize for SSE
     int n = framesToProcess;
     float sum = 0;
     while (n--) {
         float sample = *sourceP;
@@ skipping 18 matching lines @@
     ASSERT(maxP);
     *maxP = max;
 }
 #endif // OS(DARWIN)
 
 } // namespace VectorMath
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)