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Use SSE shifts for high-vol channels.

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Unknown W. Brackets 2014-12-08 21:23:47 -08:00
parent 42cd751060
commit f5d5f7d3fa
1 changed files with 14 additions and 1 deletions
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15
Core/HLE/__sceAudio.cpp
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@ -89,7 +89,6 @@ static inline s16 adjustvolume(s16 sample, int vol) {
inline void AdjustVolumeBlock(s16 *out, s16 *in, size_t size, int leftVol, int rightVol) {
#ifdef _M_SSE
// TODO: This can be done in SSE with some extra shifting (might not even affect speed.)
if (leftVol <= 0x7fff && rightVol <= 0x7fff) {
__m128i volume = _mm_set_epi16(leftVol, rightVol, leftVol, rightVol, leftVol, rightVol, leftVol, rightVol);
while (size >= 16) {
@ -101,6 +100,20 @@ inline void AdjustVolumeBlock(s16 *out, s16 *in, size_t size, int leftVol, int r
out += 16;
size -= 16;
}
} else {
// We have to shift inside the loop to avoid the signed multiply issue.
leftVol >>= 1;
rightVol >>= 1;
__m128i volume = _mm_set_epi16(leftVol, rightVol, leftVol, rightVol, leftVol, rightVol, leftVol, rightVol);
while (size >= 16) {
__m128i indata1 = _mm_loadu_si128((__m128i *)in);
__m128i indata2 = _mm_loadu_si128((__m128i *)(in + 8));
_mm_storeu_si128((__m128i *)out, _mm_slli_epi16(_mm_mulhi_epi16(indata1, volume), 1));
_mm_storeu_si128((__m128i *)(out + 8), _mm_slli_epi16(_mm_mulhi_epi16(indata2, volume), 1));
in += 16;
out += 16;
size -= 16;
}
}
#endif
for (size_t i = 0; i < size; i += 2) {