add emmintrin_compat.h for builds with gcc < 4

Change-Id: If7822e6fcd0d3568b934032322b19ba3e401df26

vp8/encoder/x86/denoising_sse2.c

@@ -15,6 +15,7 @@
 #include "vp8_rtcd.h"
 
 #include <emmintrin.h>
+#include "vpx_ports/emmintrin_compat.h"
 
 union sum_union {
     __m128i v;

vp9/common/x86/vp9_filter_sse2.c

@@ -11,6 +11,7 @@
 #include <assert.h> // for alignment checks
 #include <emmintrin.h> // SSE2
 #include "vp9/common/vp9_filter.h"
+#include "vpx_ports/emmintrin_compat.h"
 #include "vpx_ports/mem.h" // for DECLARE_ALIGNED
 #include "vp9_rtcd.h"
 

vp9/common/x86/vp9_loopfilter_x86.c

@@ -11,6 +11,7 @@
 #include <emmintrin.h>  // SSE2
 #include "vpx_config.h"
 #include "vp9/common/vp9_loopfilter.h"
+#include "vpx_ports/emmintrin_compat.h"
 
 prototype_loopfilter(vp9_loop_filter_vertical_edge_mmx);
 prototype_loopfilter(vp9_loop_filter_horizontal_edge_mmx);

vp9/common/x86/vp9_sadmxn_x86.c

@@ -12,6 +12,7 @@
 #include "./vpx_config.h"
 #include "./vp9_rtcd.h"
 #include "vpx/vpx_integer.h"
+#include "vpx_ports/emmintrin_compat.h"
 
 #if HAVE_SSE2
 unsigned int vp9_sad16x3_sse2(

vpx_ports/emmintrin_compat.h

@@ -0,0 +1,55 @@
+/*
+ *  Copyright (c) 2012 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 VPX_PORTS_EMMINTRIN_COMPAT_H
+#define VPX_PORTS_EMMINTRIN_COMPAT_H
+
+#if defined(__GNUC__) && __GNUC__ < 4
+/* From emmintrin.h (gcc 4.5.3) */
+/* Casts between various SP, DP, INT vector types.  Note that these do no
+   conversion of values, they just change the type.  */
+extern __inline __m128 __attribute__((__gnu_inline__, __always_inline__, __artificial__))
+_mm_castpd_ps(__m128d __A)
+{
+  return (__m128) __A;
+}
+
+extern __inline __m128i __attribute__((__gnu_inline__, __always_inline__, __artificial__))
+_mm_castpd_si128(__m128d __A)
+{
+  return (__m128i) __A;
+}
+
+extern __inline __m128d __attribute__((__gnu_inline__, __always_inline__, __artificial__))
+_mm_castps_pd(__m128 __A)
+{
+  return (__m128d) __A;
+}
+
+extern __inline __m128i __attribute__((__gnu_inline__, __always_inline__, __artificial__))
+_mm_castps_si128(__m128 __A)
+{
+  return (__m128i) __A;
+}
+
+extern __inline __m128 __attribute__((__gnu_inline__, __always_inline__, __artificial__))
+_mm_castsi128_ps(__m128i __A)
+{
+  return (__m128) __A;
+}
+
+extern __inline __m128d __attribute__((__gnu_inline__, __always_inline__, __artificial__))
+_mm_castsi128_pd(__m128i __A)
+{
+  return (__m128d) __A;
+}
+#endif
+
+#endif