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Code Issues Releases Activity

don't use inttypes.h - use inline function for bswap_64()

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Originally committed as revision 608 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2002-05-26 15:24:32 +00:00
parent b13788c53f
commit 74fc99894b
1 changed files with 15 additions and 23 deletions
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38
libavcodec/bswap.h
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@ -5,7 +5,6 @@
#include <byteswap.h>
#else
#include <inttypes.h> /* for __WORDSIZE */
#ifdef ARCH_X86
inline static unsigned short ByteSwap16(unsigned short x)
{
@ -34,8 +33,8 @@ inline static unsigned int ByteSwap32(unsigned int x)
inline static unsigned long long int ByteSwap64(unsigned long long int x)
{
register union { __extension__ unsigned long long int __ll;
unsigned long int __l[2]; } __x;
register union { __extension__ uint64_t __ll;
uint32_t __l[2]; } __x;
asm("xchgl %0,%1":
"=r"(__x.__l[0]),"=r"(__x.__l[1]):
"0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32))));
@ -53,26 +52,19 @@ inline static unsigned long long int ByteSwap64(unsigned long long int x)
((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
#if __WORDSIZE >= 64
# define bswap_64(x) \
((((x) & 0xff00000000000000ull) >> 56) \
| (((x) & 0x00ff000000000000ull) >> 40) \
| (((x) & 0x0000ff0000000000ull) >> 24) \
| (((x) & 0x000000ff00000000ull) >> 8) \
| (((x) & 0x00000000ff000000ull) << 8) \
| (((x) & 0x0000000000ff0000ull) << 24) \
| (((x) & 0x000000000000ff00ull) << 40) \
| (((x) & 0x00000000000000ffull) << 56))
#else
#define bswap_64(x) \
(__extension__ \
({ union { __extension__ unsigned long long int __ll; \
unsigned long int __l[2]; } __w, __r; \
__w.__ll = (x); \
__r.__l[0] = bswap_32 (__w.__l[1]); \
__r.__l[1] = bswap_32 (__w.__l[0]); \
__r.__ll; }))
#endif
inline static uint64_t ByteSwap64(uint64_t x)
{
union {
uint64_t ll;
uint32_t l[2];
} w, r;
w.ll = x;
r.l[0] = bswap_32 (w.l[1]);
r.l[1] = bswap_32 (w.l[0]);
return r.ll;
}
#define bswap_64(x) ByteSwap64(x)
#endif /* !ARCH_X86 */
#endif /* !HAVE_BYTESWAP_H */