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Faster 32 bit byteswaping code for Blackfin.

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200% faster on BF537 compiled with gcc 4.1.
patch by Marc Hoffman, mmh pleasantst com

Originally committed as revision 8802 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Marc Hoffman 2007-04-24 23:21:29 +00:00 committed by Diego Biurrun
parent 6baa294326
commit 20d45dc2a8
1 changed files with 12 additions and 0 deletions
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12
libavutil/bswap.h
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@ -125,6 +125,18 @@ static av_always_inline uint32_t bswap_32(uint32_t x){
: "+r"(x), "+r"(t)); : "+r"(x), "+r"(t));
return x; return x;
} }
#elif defined(ARCH_BFIN)
static av_always_inline uint32_t bswap_32(uint32_t x){
unsigned tmp;
asm("%1 = %0 >> 8 (V);\n\t"
"%0 = %0 << 8 (V);\n\t"
"%0 = %0 | %1;\n\t"
"%0 = PACK(%0.L, %0.H);\n\t"
: "+d"(x), "=&d"(tmp));
return x;
}
#else #else
static av_always_inline uint32_t bswap_32(uint32_t x){ static av_always_inline uint32_t bswap_32(uint32_t x){
x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF); x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);