[WIP] support arm_neon_optional flag in blink.

Source/platform/audio/mac/VectorMathMac.cpp

Index: Source/platform/audio/mac/VectorMathMac.cpp
diff --git a/Source/platform/audio/mac/VectorMathMac.cpp b/Source/platform/audio/mac/VectorMathMac.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f55833f05cf0958e17be327c258fe390218778bf
--- /dev/null
+++ b/Source/platform/audio/mac/VectorMathMac.cpp
@@ -0,0 +1,122 @@
+/*
+ * 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
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#if ENABLE(WEB_AUDIO)
+
+#include "platform/audio/VectorMath.h"
+
+#include "wtf/Assertions.h"
+#include "wtf/CPU.h"
+#include <stdint.h>
+
+#if OS(MACOSX)
+// On the Mac we use the highly optimized versions in Accelerate.framework
+// In 32-bit mode (__ppc__ or __i386__) <Accelerate/Accelerate.h> includes <vecLib/vDSP_translate.h> which defines macros of the same name as
+// our namespaced function names, so we must handle this case differently. Other architectures (64bit, ARM, etc.) do not include this header file.
+#include <Accelerate/Accelerate.h>
+#endif
+
+#if CPU(X86) || CPU(X86_64)
+#include <emmintrin.h>
+#endif
+
+#include <algorithm>
+#include <math.h>
+
+namespace blink {
+
+namespace VectorMath {
+
+void vsmul(const float* sourceP, int sourceStride, const float* scale, float* destP, int destStride, size_t framesToProcess)
+{
+#if CPU(X86)
+    ::vsmul(sourceP, sourceStride, scale, destP, destStride, framesToProcess);
+#else
+    vDSP_vsmul(sourceP, sourceStride, scale, destP, destStride, framesToProcess);
+#endif
+}
+
+void vadd(const float* source1P, int sourceStride1, const float* source2P, int sourceStride2, float* destP, int destStride, size_t framesToProcess)
+{
+#if CPU(X86)
+    ::vadd(source1P, sourceStride1, source2P, sourceStride2, destP, destStride, framesToProcess);
+#else
+    vDSP_vadd(source1P, sourceStride1, source2P, sourceStride2, destP, destStride, framesToProcess);
+#endif
+}
+
+void vmul(const float* source1P, int sourceStride1, const float* source2P, int sourceStride2, float* destP, int destStride, size_t framesToProcess)
+{
+#if CPU(X86)
+    ::vmul(source1P, sourceStride1, source2P, sourceStride2, destP, destStride, framesToProcess);
+#else
+    vDSP_vmul(source1P, sourceStride1, source2P, sourceStride2, destP, destStride, framesToProcess);
+#endif
+}
+
+void zvmul(const float* real1P, const float* imag1P, const float* real2P, const float* imag2P, float* realDestP, float* imagDestP, size_t framesToProcess)
+{
+    DSPSplitComplex sc1;
+    DSPSplitComplex sc2;
+    DSPSplitComplex dest;
+    sc1.realp = const_cast<float*>(real1P);
+    sc1.imagp = const_cast<float*>(imag1P);
+    sc2.realp = const_cast<float*>(real2P);
+    sc2.imagp = const_cast<float*>(imag2P);
+    dest.realp = realDestP;
+    dest.imagp = imagDestP;
+#if CPU(X86)
+    ::zvmul(&sc1, 1, &sc2, 1, &dest, 1, framesToProcess, 1);
+#else
+    vDSP_zvmul(&sc1, 1, &sc2, 1, &dest, 1, framesToProcess, 1);
+#endif
+}
+
+void vsma(const float* sourceP, int sourceStride, const float* scale, float* destP, int destStride, size_t framesToProcess)
+{
+    vDSP_vsma(sourceP, sourceStride, scale, destP, destStride, destP, destStride, framesToProcess);
+}
+
+void vmaxmgv(const float* sourceP, int sourceStride, float* maxP, size_t framesToProcess)
+{
+    vDSP_maxmgv(sourceP, sourceStride, maxP, framesToProcess);
+}
+
+void vsvesq(const float* sourceP, int sourceStride, float* sumP, size_t framesToProcess)
+{
+    vDSP_svesq(const_cast<float*>(sourceP), sourceStride, sumP, framesToProcess);
+}
+
+void vclip(const float* sourceP, int sourceStride, const float* lowThresholdP, const float* highThresholdP, float* destP, int destStride, size_t framesToProcess)
+{
+    vDSP_vclip(const_cast<float*>(sourceP), sourceStride, const_cast<float*>(lowThresholdP), const_cast<float*>(highThresholdP), destP, destStride, framesToProcess);
+}
+
+} // namespace VectorMath
+
+} // namespace blink
+
+#endif // ENABLE(WEB_AUDIO)