projects / libav.git / blame
| Commit | Line | Data |
|---|---|---|
| a9b3f630 NK |
1 | #ifndef __BSWAP_H__ |
| 2 | #define __BSWAP_H__ | |
| 3 | ||
| a9b3f630 NK |
4 | #ifdef HAVE_BYTESWAP_H |
| 5 | #include <byteswap.h> | |
| 6 | #else | |
| 7 | ||
| a9b3f630 NK |
8 | #ifdef ARCH_X86 |
| 9 | inline static unsigned short ByteSwap16(unsigned short x) | |
| 10 | { | |
| 11 | __asm("xchgb %b0,%h0" : | |
| 12 | "=q" (x) : | |
| 13 | "0" (x)); | |
| 14 | return x; | |
| 15 | } | |
| 16 | #define bswap_16(x) ByteSwap16(x) | |
| 17 | ||
| 18 | inline static unsigned int ByteSwap32(unsigned int x) | |
| 19 | { | |
| 20 | #if __CPU__ > 386 | |
| 21 | __asm("bswap %0": | |
| 22 | "=r" (x) : | |
| 23 | #else | |
| 24 | __asm("xchgb %b0,%h0\n" | |
| 25 | " rorl $16,%0\n" | |
| 26 | " xchgb %b0,%h0": | |
| 27 | "=q" (x) : | |
| 28 | #endif | |
| 29 | "0" (x)); | |
| 30 | return x; | |
| 31 | } | |
| 32 | #define bswap_32(x) ByteSwap32(x) | |
| 33 | ||
| 34 | inline static unsigned long long int ByteSwap64(unsigned long long int x) | |
| 35 | { | |
| 74fc9989 FB |
36 | register union { __extension__ uint64_t __ll; |
| 37 | uint32_t __l[2]; } __x; | |
| a9b3f630 NK |
38 | asm("xchgl %0,%1": |
| 39 | "=r"(__x.__l[0]),"=r"(__x.__l[1]): | |
| 40 | "0"(bswap_32((unsigned long)x)),"1"(bswap_32((unsigned long)(x>>32)))); | |
| 41 | return __x.__ll; | |
| 42 | } | |
| 43 | #define bswap_64(x) ByteSwap64(x) | |
| 44 | ||
| 45 | #else | |
| 46 | ||
| 47 | #define bswap_16(x) (((x) & 0x00ff) << 8 | ((x) & 0xff00) >> 8) | |
| 48 | ||
| 49 | ||
| 50 | // code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc. | |
| 51 | #define bswap_32(x) \ | |
| 52 | ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \ | |
| 53 | (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24)) | |
| 54 | ||
| 74fc9989 FB |
55 | inline static uint64_t ByteSwap64(uint64_t x) |
| 56 | { | |
| 57 | union { | |
| 58 | uint64_t ll; | |
| 59 | uint32_t l[2]; | |
| 60 | } w, r; | |
| 61 | w.ll = x; | |
| 62 | r.l[0] = bswap_32 (w.l[1]); | |
| 63 | r.l[1] = bswap_32 (w.l[0]); | |
| 64 | return r.ll; | |
| 65 | } | |
| 66 | #define bswap_64(x) ByteSwap64(x) | |
| 67 | ||
| a9b3f630 NK |
68 | #endif /* !ARCH_X86 */ |
| 69 | ||
| 70 | #endif /* !HAVE_BYTESWAP_H */ | |
| 71 | ||
| 72 | // be2me ... BigEndian to MachineEndian | |
| 73 | // le2me ... LittleEndian to MachineEndian | |
| 74 | ||
| 75 | #ifdef WORDS_BIGENDIAN | |
| 76 | #define be2me_16(x) (x) | |
| 77 | #define be2me_32(x) (x) | |
| 78 | #define be2me_64(x) (x) | |
| 79 | #define le2me_16(x) bswap_16(x) | |
| 80 | #define le2me_32(x) bswap_32(x) | |
| 81 | #define le2me_64(x) bswap_64(x) | |
| 82 | #else | |
| 83 | #define be2me_16(x) bswap_16(x) | |
| 84 | #define be2me_32(x) bswap_32(x) | |
| 85 | #define be2me_64(x) bswap_64(x) | |
| 86 | #define le2me_16(x) (x) | |
| 87 | #define le2me_32(x) (x) | |
| 88 | #define le2me_64(x) (x) | |
| 89 | #endif | |
| 90 | ||
| b17c92d1 | 91 | #endif /* __BSWAP_H__ */ |