libvpx: Add VP9 decoder.

source/libvpx/vp9/encoder/x86/vp9_mcomp_x86.h

+/*
+ *  Copyright (c) 2010 The WebM 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 in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#ifndef VP9_ENCODER_X86_VP9_MCOMP_X86_H_
+#define VP9_ENCODER_X86_VP9_MCOMP_X86_H_
+
+#if HAVE_SSE3
+#if !CONFIG_RUNTIME_CPU_DETECT
+
+#undef  vp9_search_full_search
+#define vp9_search_full_search vp9_full_search_sadx3
+
+#undef  vp9_search_refining_search
+#define vp9_search_refining_search vp9_refining_search_sadx4
+
+#undef  vp9_search_diamond_search
+#define vp9_search_diamond_search vp9_diamond_search_sadx4
+
+#endif
+#endif
+
+#if HAVE_SSE4_1
+#if !CONFIG_RUNTIME_CPU_DETECT
+
+#undef  vp9_search_full_search
+#define vp9_search_full_search vp9_full_search_sadx8
+
+#endif
+#endif
+
+#endif
+