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Use SSE intrinsics for uint32_t byte swapping

This commit is contained in:
raven02 2015-07-02 23:25:10 +08:00
parent fea115a6f4
commit fcf89a61e7
1 changed files with 30 additions and 4 deletions
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34
src/xenia/base/memory_generic.cc
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@ -44,10 +44,12 @@ void copy_and_swap_16_aligned(uint16_t* dest, const uint16_t* src,
void copy_and_swap_16_unaligned(uint16_t* dest, const uint16_t* src, void copy_and_swap_16_unaligned(uint16_t* dest, const uint16_t* src,
size_t count) { size_t count) {
size_t i; size_t i;
__m128i input, output;
for (i = 0; i + 8 <= count; i += 8) { for (i = 0; i + 8 <= count; i += 8) {
__m128i s = _mm_loadu_si128((__m128i*)&src[i]); input = _mm_loadu_si128((__m128i*)&src[i]);
__m128i d = _mm_or_si128(_mm_slli_epi16(s, 8), _mm_srli_epi16(s, 8)); output = _mm_or_si128(_mm_slli_epi16(input, 8), _mm_srli_epi16(input, 8));
_mm_storeu_si128((__m128i*)&dest[i], d); _mm_storeu_si128((__m128i*)&dest[i], output);
} }
for (; i < count; ++i) { // handle residual elements for (; i < count; ++i) { // handle residual elements
@ -62,7 +64,31 @@ void copy_and_swap_32_aligned(uint32_t* dest, const uint32_t* src,
void copy_and_swap_32_unaligned(uint32_t* dest, const uint32_t* src, void copy_and_swap_32_unaligned(uint32_t* dest, const uint32_t* src,
size_t count) { size_t count) {
for (size_t i = 0; i < count; ++i) { size_t i;
__m128i input, byte1, byte2, byte3, byte4, output;
__m128i byte2mask = _mm_set1_epi32(0x00FF0000);
__m128i byte3mask = _mm_set1_epi32(0x0000FF00);
for (i = 0; i + 4 <= count; i += 4) {
input = _mm_loadu_si128((__m128i*)&src[i]);
// Do the four shifts
byte1 = _mm_slli_epi32(input, 24);
byte2 = _mm_slli_epi32(input, 8);
byte3 = _mm_srli_epi32(input, 8);
byte4 = _mm_srli_epi32(input, 24);
// Or bytes together
output = _mm_or_si128(byte1, byte4);
byte2 = _mm_and_si128(byte2, byte2mask);
output = _mm_or_si128(output, byte2);
byte3 = _mm_and_si128(byte3, byte3mask);
output = _mm_or_si128(output, byte3);
_mm_storeu_si128((__m128i*)&dest[i], output);
}
for (; i < count; ++i) { // handle residual elements
dest[i] = byte_swap(src[i]); dest[i] = byte_swap(src[i]);
} }
} }