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Improved random generator for SIMD dither

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This commit is contained in:
Ken Cooke 2015-10-01 20:32:48 -07:00
parent e1e34b2ce5
commit 3555e90cf6
1 changed files with 4 additions and 4 deletions
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8
libraries/audio/src/AudioSRC.cpp
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@ -975,11 +975,11 @@ void AudioSRC::convertInputFromInt16(const int16_t* input, float** outputs, int
// fast TPDF dither in [-1.0f, 1.0f]
static inline __m128 dither4() {
static __m128i rz = _mm_set_epi16(0, -12285, 8251, 22985, -4297, 14758, -19785, -26093);
static __m128i rz;
// update the parallel LCGs
rz = _mm_mullo_epi16(rz, _mm_set1_epi16(25173));
rz = _mm_add_epi16(rz, _mm_set1_epi16(13849));
// update the 8 different maximum-length LCGs
rz = _mm_mullo_epi16(rz, _mm_set_epi16(25173, -25511, -5975, -23279, 19445, -27591, 30185, -3495));
rz = _mm_add_epi16(rz, _mm_set_epi16(13849, -32767, 105, -19675, -7701, -32679, -13225, 28013));
// promote to 32-bit
__m128i r0 = _mm_unpacklo_epi16(rz, _mm_setzero_si128());