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ARM: ARMv6 optimised bswap_16/32

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Originally committed as revision 14239 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2008-07-15 19:05:49 +00:00
parent 29c8b6263a
commit ea66f252a8
1 changed files with 4 additions and 0 deletions
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4
libavutil/bswap.h
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@ -40,6 +40,8 @@ static av_always_inline av_const uint16_t bswap_16(uint16_t x)
asm("rorw $8, %0" : "+r"(x)); asm("rorw $8, %0" : "+r"(x));
#elif defined(ARCH_SH4) #elif defined(ARCH_SH4)
asm("swap.b %0,%0" : "=r"(x) : "0"(x)); asm("swap.b %0,%0" : "=r"(x) : "0"(x));
#elif defined(HAVE_ARMV6)
asm("rev16 %0, %0" : "+r"(x));
#else #else
x= (x>>8) | (x<<8); x= (x>>8) | (x<<8);
#endif #endif
@ -62,6 +64,8 @@ static av_always_inline av_const uint32_t bswap_32(uint32_t x)
"swap.w %0,%0\n" "swap.w %0,%0\n"
"swap.b %0,%0\n" "swap.b %0,%0\n"
: "=r"(x) : "0"(x)); : "=r"(x) : "0"(x));
#elif defined(HAVE_ARMV6)
asm("rev %0, %0" : "+r"(x));
#elif defined(ARCH_ARM) #elif defined(ARCH_ARM)
uint32_t t; uint32_t t;
asm ("eor %1, %0, %0, ror #16 \n\t" asm ("eor %1, %0, %0, ror #16 \n\t"