mirror of https://git.ffmpeg.org/ffmpeg.git
143 lines
2.8 KiB
C
143 lines
2.8 KiB
C
/**
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* @file bswap.h
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* byte swap.
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*/
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#ifndef __BSWAP_H__
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#define __BSWAP_H__
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#ifdef HAVE_BYTESWAP_H
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#include <byteswap.h>
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#else
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#ifdef ARCH_X86_64
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# define LEGACY_REGS "=Q"
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#else
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# define LEGACY_REGS "=q"
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#endif
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#if defined(ARCH_X86) || defined(ARCH_X86_64)
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static inline uint16_t ByteSwap16(uint16_t x)
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{
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__asm("xchgb %b0,%h0" :
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LEGACY_REGS (x) :
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"0" (x));
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return x;
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}
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#define bswap_16(x) ByteSwap16(x)
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static inline uint32_t ByteSwap32(uint32_t x)
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{
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#if __CPU__ > 386
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__asm("bswap %0":
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"=r" (x) :
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#else
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__asm("xchgb %b0,%h0\n"
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" rorl $16,%0\n"
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" xchgb %b0,%h0":
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LEGACY_REGS (x) :
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#endif
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"0" (x));
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return x;
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}
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#define bswap_32(x) ByteSwap32(x)
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static inline uint64_t ByteSwap64(uint64_t x)
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{
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#ifdef ARCH_X86_64
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__asm("bswap %0":
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"=r" (x) :
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"0" (x));
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return x;
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#else
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register union { __extension__ uint64_t __ll;
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uint32_t __l[2]; } __x;
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asm("xchgl %0,%1":
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"=r"(__x.__l[0]),"=r"(__x.__l[1]):
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"0"(bswap_32((uint32_t)x)),"1"(bswap_32((uint32_t)(x>>32))));
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return __x.__ll;
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#endif
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}
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#define bswap_64(x) ByteSwap64(x)
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#elif defined(ARCH_SH4)
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static inline uint16_t ByteSwap16(uint16_t x) {
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__asm__("swap.b %0,%0":"=r"(x):"0"(x));
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return x;
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}
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static inline uint32_t ByteSwap32(uint32_t x) {
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__asm__(
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"swap.b %0,%0\n"
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"swap.w %0,%0\n"
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"swap.b %0,%0\n"
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:"=r"(x):"0"(x));
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return x;
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}
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#define bswap_16(x) ByteSwap16(x)
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#define bswap_32(x) ByteSwap32(x)
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static inline uint64_t ByteSwap64(uint64_t x)
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{
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union {
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uint64_t ll;
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struct {
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uint32_t l,h;
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} l;
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} r;
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r.l.l = bswap_32 (x);
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r.l.h = bswap_32 (x>>32);
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return r.ll;
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}
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#define bswap_64(x) ByteSwap64(x)
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#else
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#define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8)
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// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
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#define bswap_32(x) \
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((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
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(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
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static inline uint64_t ByteSwap64(uint64_t x)
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{
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union {
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uint64_t ll;
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uint32_t l[2];
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} w, r;
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w.ll = x;
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r.l[0] = bswap_32 (w.l[1]);
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r.l[1] = bswap_32 (w.l[0]);
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return r.ll;
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}
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#define bswap_64(x) ByteSwap64(x)
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#endif /* !ARCH_X86 */
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#endif /* !HAVE_BYTESWAP_H */
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// be2me ... BigEndian to MachineEndian
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// le2me ... LittleEndian to MachineEndian
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#ifdef WORDS_BIGENDIAN
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#define be2me_16(x) (x)
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#define be2me_32(x) (x)
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#define be2me_64(x) (x)
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#define le2me_16(x) bswap_16(x)
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#define le2me_32(x) bswap_32(x)
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#define le2me_64(x) bswap_64(x)
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#else
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#define be2me_16(x) bswap_16(x)
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#define be2me_32(x) bswap_32(x)
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#define be2me_64(x) bswap_64(x)
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#define le2me_16(x) (x)
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#define le2me_32(x) (x)
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#define le2me_64(x) (x)
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#endif
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#endif /* __BSWAP_H__ */
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