bswap.h
资源名称:tcpmp.rar [点击查看]
上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:3k
源码类别:
Windows CE
开发平台:
C/C++
- /**
- * @file bswap.h
- * byte swap.
- */
- #ifndef __BSWAP_H__
- #define __BSWAP_H__
- #ifdef HAVE_BYTESWAP_H
- #include <byteswap.h>
- #else
- #ifdef ARCH_X86_64
- # define LEGACY_REGS "=Q"
- #else
- # define LEGACY_REGS "=q"
- #endif
- #if defined(ARCH_X86) || defined(ARCH_X86_64)
- static always_inline uint16_t bswap_16(uint16_t x)
- {
- __asm("rorw $8, %0" :
- LEGACY_REGS (x) :
- "0" (x));
- return x;
- }
- static always_inline uint32_t bswap_32(uint32_t x)
- {
- #if __CPU__ > 386
- __asm("bswap %0":
- "=r" (x) :
- #else
- __asm("xchgb %b0,%h0n"
- " rorl $16,%0n"
- " xchgb %b0,%h0":
- LEGACY_REGS (x) :
- #endif
- "0" (x));
- return x;
- }
- static inline uint64_t bswap_64(uint64_t x)
- {
- #ifdef ARCH_X86_64
- __asm("bswap %0":
- "=r" (x) :
- "0" (x));
- return x;
- #else
- union {
- uint64_t ll;
- struct {
- uint32_t l,h;
- } l;
- } r;
- r.l.l = bswap_32 (x);
- r.l.h = bswap_32 (x>>32);
- return r.ll;
- #endif
- }
- #elif defined(ARCH_SH4)
- static always_inline uint16_t bswap_16(uint16_t x) {
- __asm__("swap.b %0,%0":"=r"(x):"0"(x));
- return x;
- }
- static always_inline uint32_t bswap_32(uint32_t x) {
- __asm__(
- "swap.b %0,%0n"
- "swap.w %0,%0n"
- "swap.b %0,%0n"
- :"=r"(x):"0"(x));
- return x;
- }
- static inline uint64_t bswap_64(uint64_t x)
- {
- union {
- uint64_t ll;
- struct {
- uint32_t l,h;
- } l;
- } r;
- r.l.l = bswap_32 (x);
- r.l.h = bswap_32 (x>>32);
- return r.ll;
- }
- #else
- static always_inline uint16_t bswap_16(uint16_t x){
- return (uint16_t)((x>>8) | (x<<8)); //Picard
- }
- #ifdef ARCH_ARM
- static always_inline uint32_t bswap_32(uint32_t x){
- uint32_t t;
- __asm__ (
- "eor %1, %0, %0, ror #16 nt"
- "bic %1, %1, #0xFF0000 nt"
- "mov %0, %0, ror #8 nt"
- "eor %0, %0, %1, lsr #8 nt"
- : "+r"(x), "+r"(t));
- return x;
- }
- #else
- static always_inline uint32_t bswap_32(uint32_t x){
- x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
- return (x>>16) | (x<<16);
- }
- #endif
- static inline uint64_t bswap_64(uint64_t x)
- {
- #if 0
- x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
- x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
- return (x>>32) | (x<<32);
- #else
- 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;
- #endif
- }
- #endif /* !ARCH_X86 */
- #endif /* !HAVE_BYTESWAP_H */
- // be2me ... BigEndian to MachineEndian
- // le2me ... LittleEndian to MachineEndian
- #ifdef WORDS_BIGENDIAN
- #define be2me_16(x) (x)
- #define be2me_32(x) (x)
- #define be2me_64(x) (x)
- #define le2me_16(x) bswap_16(x)
- #define le2me_32(x) bswap_32(x)
- #define le2me_64(x) bswap_64(x)
- #else
- #define be2me_16(x) bswap_16(x)
- #define be2me_32(x) bswap_32(x)
- #define be2me_64(x) bswap_64(x)
- #define le2me_16(x) (x)
- #define le2me_32(x) (x)
- #define le2me_64(x) (x)
- #endif
- #endif /* __BSWAP_H__ */