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tools/common: Add byte_swap fallbacks for unknown platforms.

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This commit is contained in:
James Benton 2019-01-06 11:18:51 +00:00
parent 56f70b2865
commit 8676bcdc01
1 changed files with 17 additions and 4 deletions
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21
tools/common/utils.h
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@ -55,12 +55,11 @@ struct byte_swap_t<Type, 2>
{
#ifdef PLATFORM_WINDOWS
return bit_cast<Type>(_byteswap_ushort(bit_cast<uint16_t>(src)));
#elif defined(PLATFORM_APPLE)
// Apple has no 16-bit byteswap intrinsic
const uint16_t data = bit_cast<uint16_t>(src);
return bit_cast<Type>((uint16_t)((data >> 8) | (data << 8)));
#elif defined(PLATFORM_LINUX)
return bit_cast<Type>(bswap_16(bit_cast<uint16_t>(src)));
#else
const uint16_t data = bit_cast<uint16_t>(src);
return bit_cast<Type>(static_cast<uint16_t>((data >> 8) | (data << 8)));
#endif
}
};
@ -76,6 +75,14 @@ struct byte_swap_t<Type, 4>
return bit_cast<Type>(__builtin_bswap32(bit_cast<uint32_t>(src)));
#elif defined(PLATFORM_LINUX)
return bit_cast<Type>(bswap_32(bit_cast<uint32_t>(src)));
#else
const uint32_t data = bit_cast<uint32_t>(src);
return bit_cast<Type>(
((data & 0xFF000000u) >> 24) |
((data & 0x00FF0000u) >> 8) |
((data & 0x0000FF00u) << 8) |
((data & 0x000000FFu) << 24)
);
#endif
}
};
@ -91,6 +98,12 @@ struct byte_swap_t<Type, 8>
return bit_cast<Type>(__builtin_bswap64(bit_cast<uint64_t>(src)));
#elif defined(PLATFORM_LINUX)
return bit_cast<Type>(bswap_64(bit_cast<uint64_t>(src)));
#else
uint64_t data = bit_cast<uint64_t>(src);
data = ((data & 0x00000000FFFFFFFFull) << 32) | ((data & 0xFFFFFFFF00000000ull) >> 32);
data = ((data & 0x0000FFFF0000FFFFull) << 16) | ((data & 0xFFFF0000FFFF0000ull) >> 16);
data = ((data & 0x00FF00FF00FF00FFull) << 8) | ((data & 0xFF00FF00FF00FF00ull) >> 8);
return bit_cast<Type>(data);
#endif
}
};