[FFmpeg-cvslog] avutil/x86/bswap: Add msvc bswap instrinsics.

Matt Oliver git at videolan.org
Thu Nov 12 06:55:59 CET 2015


ffmpeg | branch: master | Matt Oliver <protogonoi at gmail.com> | Mon Nov  9 20:19:32 2015 +1100| [9b9c9ef3b42116e7ad2111fc8145f4eca12d657b] | committer: Matt Oliver

avutil/x86/bswap: Add msvc bswap instrinsics.

This adds msvc optimisations as well as fixing an error in icl whereby it will generate invalid code otherwise.

Signed-off-by: Matt Oliver <protogonoi at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9b9c9ef3b42116e7ad2111fc8145f4eca12d657b
---

 libavutil/x86/bswap.h |   25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/libavutil/x86/bswap.h b/libavutil/x86/bswap.h
index 3efd578..11d143b 100644
--- a/libavutil/x86/bswap.h
+++ b/libavutil/x86/bswap.h
@@ -28,7 +28,30 @@
 #include "config.h"
 #include "libavutil/attributes.h"
 
-#if HAVE_INLINE_ASM
+#if defined(_MSC_VER)
+
+#define av_bswap16 av_bswap16
+static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
+{
+    return _rotr16(x, 8);
+}
+
+#define av_bswap32 av_bswap32
+static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
+{
+    return _byteswap_ulong(x);
+}
+
+#if ARCH_X86_64
+#define av_bswap64 av_bswap64
+static inline uint64_t av_const av_bswap64(uint64_t x)
+{
+    return _byteswap_uint64(x);
+}
+#endif
+
+
+#elif HAVE_INLINE_ASM
 
 #if AV_GCC_VERSION_AT_MOST(4,0)
 #define av_bswap16 av_bswap16



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