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use intrinsics for endian swap

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This commit is contained in:
toxieainc 2022-07-11 18:42:15 +02:00
parent b2b8396947
commit ba7145df52
1 changed files with 26 additions and 3 deletions
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27
Src/Util/ByteSwap.cpp
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@ -1,19 +1,41 @@
#include "Util/ByteSwap.h" #include "Util/ByteSwap.h"
#ifdef _MSC_VER
#include <intrin.h>
#endif
namespace Util namespace Util
{ {
void FlipEndian16(uint8_t *buffer, size_t size) void FlipEndian16(uint8_t * const buffer, const size_t size)
{ {
#ifdef _MSC_VER
uint16_t * const buffer16 = (uint16_t*)buffer;
for (size_t i = 0; i < size/2; i++)
buffer16[i] = _byteswap_ushort(buffer16[i]);
#elif 1 // assume GCC
uint16_t * const buffer16 = (uint16_t*)buffer;
for (size_t i = 0; i < size/2; i++)
buffer16[i] = __builtin_bswap16(buffer16[i]);
#else
for (size_t i = 0; i < (size & ~1); i += 2) for (size_t i = 0; i < (size & ~1); i += 2)
{ {
uint8_t tmp = buffer[i + 0]; uint8_t tmp = buffer[i + 0];
buffer[i + 0] = buffer[i + 1]; buffer[i + 0] = buffer[i + 1];
buffer[i + 1] = tmp; buffer[i + 1] = tmp;
} }
#endif
} }
void FlipEndian32(uint8_t *buffer, size_t size) void FlipEndian32(uint8_t * const buffer, const size_t size)
{ {
#ifdef _MSC_VER
uint32_t * const buffer32 = (uint32_t*)buffer;
for (size_t i = 0; i < size/4; i++)
buffer32[i] = _byteswap_ulong(buffer32[i]);
#elif 1 // assume GCC
uint32_t * const buffer32 = (uint32_t*)buffer;
for (size_t i = 0; i < size/4; i++)
buffer32[i] = __builtin_bswap32(buffer32[i]);
#else
for (size_t i = 0; i < (size & ~3); i += 4) for (size_t i = 0; i < (size & ~3); i += 4)
{ {
uint8_t tmp1 = buffer[i+0]; uint8_t tmp1 = buffer[i+0];
@ -23,5 +45,6 @@ namespace Util
buffer[i+2] = tmp2; buffer[i+2] = tmp2;
buffer[i+3] = tmp1; buffer[i+3] = tmp1;
} }
#endif
} }
} // Util } // Util