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"fast unaligned" bytestream functions

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patch by Ramiro Polla ramiro lisha ufsc br
original thread:
date: 03/11/2007 03:06 AM
subject: [Ffmpeg-devel] [PATCH] Machine endian bytestream functions

Originally committed as revision 8803 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla
2007-04-25 08:47:15 +00:00
committed by Benoit Fouet
parent 20d45dc2a8
commit 7b829d2ab6
2 changed files with 36 additions and 0 deletions
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4
configure vendored
View File

@@ -628,6 +628,7 @@ HAVE_LIST="
ebx_available
fast_64bit
fast_cmov
fast_unaligned
freetype2
imlib2
inet_aton
@@ -765,6 +766,7 @@ powerpc_perf="no"
mmx="default"
cmov="no"
fast_cmov="no"
fast_unaligned="no"
armv5te="default"
armv6="default"
iwmmxt="default"
@@ -975,9 +977,11 @@ done
case "$arch" in
i386|i486|i586|i686|i86pc|BePC)
arch="x86_32"
enable fast_unaligned
;;
x86_64|amd64)
arch="x86_32"
enable fast_unaligned
canon_arch="`$cc -dumpmachine | sed -e 's,\([^-]*\)-.*,\1,'`"
if [ x"$canon_arch" = x"x86_64" -o x"$canon_arch" = x"amd64" ]; then
if [ -z "`echo $CFLAGS | grep -- -m32`" ]; then

32
libavutil/intreadwrite.h
View File

@@ -50,6 +50,21 @@ struct unaligned_16 { uint16_t l; } __attribute__((packed));
#define AV_RL8(x) AV_RB8(x)
#define AV_WL8(p, d) AV_WB8(p, d)
#ifdef HAVE_FAST_UNALIGNED
# ifdef WORDS_BIGENDIAN
# define AV_RB16(x) LD16(x)
# define AV_WB16(p, d) ST16(p, d)
# define AV_RL16(x) bswap_16(LD16(x))
# define AV_WL16(p, d) ST16(p, bswap_16(d))
# else /* WORDS_BIGENDIAN */
# define AV_RB16(x) bswap_16(LD16(x))
# define AV_WB16(p, d) ST16(p, bswap_16(d))
# define AV_RL16(x) LD16(x)
# define AV_WL16(p, d) ST16(p, d)
# endif
#else /* HAVE_FAST_UNALIGNED */
#define AV_RB16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
#define AV_WB16(p, d) { \
((uint8_t*)(p))[1] = (d); \
@@ -60,6 +75,7 @@ struct unaligned_16 { uint16_t l; } __attribute__((packed));
#define AV_WL16(p, d) { \
((uint8_t*)(p))[0] = (d); \
((uint8_t*)(p))[1] = (d)>>8; }
#endif
#define AV_RB24(x) ((((uint8_t*)(x))[0] << 16) | \
(((uint8_t*)(x))[1] << 8) | \
@@ -77,6 +93,21 @@ struct unaligned_16 { uint16_t l; } __attribute__((packed));
((uint8_t*)(p))[1] = (d)>>8; \
((uint8_t*)(p))[2] = (d)>>16; }
#ifdef HAVE_FAST_UNALIGNED
# ifdef WORDS_BIGENDIAN
# define AV_RB32(x) LD32(x)
# define AV_WB32(p, d) ST32(p, d)
# define AV_RL32(x) bswap_32(LD32(x))
# define AV_WL32(p, d) ST32(p, bswap_32(d))
# else /* WORDS_BIGENDIAN */
# define AV_RB32(x) bswap_32(LD32(x))
# define AV_WB32(p, d) ST32(p, bswap_32(d))
# define AV_RL32(x) LD32(x)
# define AV_WL32(p, d) ST32(p, d)
# endif
#else /* HAVE_FAST_UNALIGNED */
#define AV_RB32(x) ((((uint8_t*)(x))[0] << 24) | \
(((uint8_t*)(x))[1] << 16) | \
(((uint8_t*)(x))[2] << 8) | \
@@ -96,5 +127,6 @@ struct unaligned_16 { uint16_t l; } __attribute__((packed));
((uint8_t*)(p))[1] = (d)>>8; \
((uint8_t*)(p))[2] = (d)>>16; \
((uint8_t*)(p))[3] = (d)>>24; }
#endif
#endif /* INTREADWRITE_H */