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Fixed bug 4210 - SSE2-based converter makes junk result of S32 -> Float 

At the HG state abdd17144682, 64-bit assemblies are using SSE2-based resampler, produces junk sound when converting the S32 -> Float32 -> S16 chain. The `NEED_SCALAR_CONVERTER_FALLBACKS` thing works perfectly.

If I will find a reason that caused this mistake, I'll send a patch by myself.
This commit is contained in:
Wohlstand 2018-07-02 03:53:57 +03:00
parent 507e271b3e
commit ff8c62f227
1 changed files with 1 additions and 1 deletions
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2
src/audio/SDL_audiotypecvt.c
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@ -533,7 +533,7 @@ SDL_Convert_S32_to_F32_SSE2(SDL_AudioCVT *cvt, SDL_AudioFormat format)
const __m128i *mmsrc = (const __m128i *) src;
while (i >= 4) { /* 4 * sint32 */
/* shift out lowest bits so int fits in a float32. Small precision loss, but much faster. */
_mm_store_ps(dst, _mm_mul_ps(_mm_cvtepi32_ps(_mm_srli_epi32(_mm_load_si128(mmsrc), 8)), divby8388607));
_mm_store_ps(dst, _mm_mul_ps(_mm_cvtepi32_ps(_mm_srai_epi32(_mm_load_si128(mmsrc), 8)), divby8388607));
i -= 4; mmsrc++; dst += 4;
}
src = (const Sint32 *) mmsrc;