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byte swap performance on windows

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Brannon King 2020-01-30 17:10:57 -07:00 committed by Anthony Fieroni
parent 508542350b
commit 81c7695526
1 changed files with 15 additions and 0 deletions
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15
src/compat/byteswap.h
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@ -30,26 +30,40 @@
#endif // !defined(bswap_16)
#else
#include <boost/endian/detail/intrinsic.hpp>
// Non-Mac OS X / non-Darwin
#if HAVE_DECL_BSWAP_16 == 0
inline uint16_t bswap_16(uint16_t x)
{
#ifdef BOOST_ENDIAN_INTRINSIC_BYTE_SWAP_2
return BOOST_ENDIAN_INTRINSIC_BYTE_SWAP_2(x);
#else
return (x >> 8) | (x << 8);
#endif
}
#endif // HAVE_DECL_BSWAP16 == 0
#if HAVE_DECL_BSWAP_32 == 0
inline uint32_t bswap_32(uint32_t x)
{
#ifdef BOOST_ENDIAN_INTRINSIC_BYTE_SWAP_4
return BOOST_ENDIAN_INTRINSIC_BYTE_SWAP_4(x);
#else
return (((x & 0xff000000U) >> 24) | ((x & 0x00ff0000U) >> 8) |
((x & 0x0000ff00U) << 8) | ((x & 0x000000ffU) << 24));
#endif
}
#endif // HAVE_DECL_BSWAP32 == 0
#if HAVE_DECL_BSWAP_64 == 0
inline uint64_t bswap_64(uint64_t x)
{
#ifdef BOOST_ENDIAN_INTRINSIC_BYTE_SWAP_8
return BOOST_ENDIAN_INTRINSIC_BYTE_SWAP_8(x);
#else
return (((x & 0xff00000000000000ull) >> 56)
| ((x & 0x00ff000000000000ull) >> 40)
| ((x & 0x0000ff0000000000ull) >> 24)
@ -58,6 +72,7 @@ inline uint64_t bswap_64(uint64_t x)
| ((x & 0x0000000000ff0000ull) << 24)
| ((x & 0x000000000000ff00ull) << 40)
| ((x & 0x00000000000000ffull) << 56));
#endif
}
#endif // HAVE_DECL_BSWAP64 == 0