Commit 53987e9b4fe4be6a1c524e5dd57ed488fa4b6218
2021-07-28T21:03:42
Optimized SDL_Convert51ToStereo_AVX
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diff --git a/src/audio/SDL_audiocvt.c b/src/audio/SDL_audiocvt.c
index 97f10df..7d6bade 100644
--- a/src/audio/SDL_audiocvt.c
+++ b/src/audio/SDL_audiocvt.c
@@ -134,32 +134,23 @@ SDL_Convert51ToStereo_AVX(SDL_AudioCVT * cvt, SDL_AudioFormat format)
SDL_assert(format == AUDIO_F32SYS);
/* SDL's 5.1 layout: FL+FR+FC+LFE+BL+BR */
- /* This implementation is based on SDL_Convert51ToStereo_SSE */
- /* Because AVX operates with two 128 bit lanes, the shuffling */
- /* here is not very efficient. AVX512F lifts this limitation. */
while (i >= 4) {
- __m128 in0 = _mm_loadu_ps(src); /* 0FL 0FR 0FC 0LF */
- __m128 in1 = _mm_loadu_ps(src + 4); /* 0BL 0BR 1FL 1FR */
- __m128 in2 = _mm_loadu_ps(src + 8); /* 1FC 1LF 1BL 1BR */
- __m128 in3 = _mm_loadu_ps(src + 12); /* 2FL 2FR 2FC 2LF */
- __m128 in4 = _mm_loadu_ps(src + 16); /* 2BL 2BR 3FL 3FR */
- __m128 in5 = _mm_loadu_ps(src + 20); /* 3FC 3LF 3BL 3BR */
+ __m256 in0 = _mm256_loadu_ps(src + 0); /* 0FL 0FR 0FC 0LF 0BL 0BR 1FL 1FR */
+ __m256 in1 = _mm256_loadu_ps(src + 8); /* 1FC 1LF 1BL 1BR 2FL 2FR 2FC 2LF */
+ __m256 in2 = _mm256_loadu_ps(src + 16); /* 2BL 2BR 3FL 3FR 3FC 3LF 3BL 3BR */
+
+ /* 0FL 0FR 0FC 0LF 2FL 2FR 2FC 2LF */
+ __m256 temp0 = _mm256_blend_ps(in0, in1, 0xF0);
+ /* 1FC 1LF 1BL 1BR 3FC 3LF 3BL 3BR */
+ __m256 temp1 = _mm256_blend_ps(in1, in2, 0xF0);
- /* 0FC 0FC 1FC 1FC */
- __m128 fc_distributed_lo = _mm_shuffle_ps(in0, in2, _MM_SHUFFLE(0, 0, 2, 2));
- /* 2FC 2FC 3FC 3FC */
- __m128 fc_distributed_hi = _mm_shuffle_ps(in3, in5, _MM_SHUFFLE(0, 0, 2, 2));
/* 0FC 0FC 1FC 1FC 2FC 2FC 3FC 3FC */
- __m256 fc_distributed = _mm256_mul_ps(half, _mm256_insertf128_ps(_mm256_castps128_ps256(fc_distributed_lo), fc_distributed_hi, 1));
+ __m256 fc_distributed = _mm256_mul_ps(half, _mm256_shuffle_ps(temp0, temp1, _MM_SHUFFLE(0, 0, 2, 2)));
- /* 0FL 0FR 1BL 1BR */
- __m128 permuted0_lo = _mm_shuffle_ps(in0, in2, _MM_SHUFFLE(3, 2, 1, 0));
- /* 2FL 2FR 3BL 3BR */
- __m128 permuted0_hi = _mm_shuffle_ps(in3, in5, _MM_SHUFFLE(3, 2, 1, 0));
/* 0FL 0FR 1BL 1BR 2FL 2FR 3BL 3BR */
- __m256 permuted0 = _mm256_insertf128_ps(_mm256_castps128_ps256(permuted0_lo), permuted0_hi, 1);
+ __m256 permuted0 = _mm256_blend_ps(temp0, temp1, 0xCC);
/* 0BL 0BR 1FL 1FR 2BL 2BR 3FL 3FR */
- __m256 permuted1 = _mm256_insertf128_ps(_mm256_castps128_ps256(in1), in4, 1);
+ __m256 permuted1 = _mm256_permute2f128_ps(in0, in2, 0x21);
/* 0FL 0FR 1BL 1BR 2FL 2FR 3BL 3BR */
/* + 0BL 0BR 1FL 1FR 2BL 2BR 3FL 3FR */