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32/64-bit agnostic x86 bswap

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Originally committed as revision 12496 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2008-03-18 22:28:33 +00:00
parent c5fec7d76c
commit 3662d880ed
1 changed files with 6 additions and 14 deletions
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20
libavutil/bswap.h
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@ -34,16 +34,10 @@
#include <byteswap.h>
#else
#ifdef ARCH_X86_64
# define LEGACY_REGS "=Q"
#else
# define LEGACY_REGS "=q"
#endif
static av_always_inline uint16_t bswap_16(uint16_t x)
{
#if defined(ARCH_X86)
asm("rorw $8, %0" : LEGACY_REGS (x) : "0" (x));
asm("rorw $8, %0" : "+r"(x));
#elif defined(ARCH_SH4)
asm("swap.b %0,%0" : "=r"(x) : "0"(x));
#else
@ -56,15 +50,13 @@ static av_always_inline uint32_t bswap_32(uint32_t x)
{
#if defined(ARCH_X86)
#ifdef HAVE_BSWAP
asm("bswap %0":
"=r" (x) :
asm("bswap %0" : "+r" (x));
#else
asm("xchgb %b0,%h0\n"
"rorl $16,%0 \n"
"xchgb %b0,%h0":
LEGACY_REGS (x) :
asm("rorw $8, %w0 \n\t"
"rorl $16, %0 \n\t"
"rorw $8, %w0"
: "+r"(x));
#endif
"0" (x));
#elif defined(ARCH_SH4)
asm("swap.b %0,%0\n"
"swap.w %0,%0\n"