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| /* | |
| Sort 4 floats in SSE vector using sorting network and return indices of moved values | |
| */ | |
| inline __m128i v4_sort(__m128& v) | |
| { | |
| auto i = _mm_castsi128_ps(_mm_set_epi32(3, 2, 1, 0)); | |
| const auto mask = _mm_castsi128_ps(_mm_set1_epi32(0xFFFFFFFC)); | |
| // Place indices in lower 2 bits of mantissa | |
| v = _mm_or_ps(_mm_and_ps(v, mask), i); | |
| // Simple sorting network for n=4 | |
| // First pass | |
| auto temp = _mm_shuffle_ps(v, v, _MM_SHUFFLE(1, 0, 3, 2)); | |
| auto cmp = _mm_cmplt_ps(v, temp); | |
| cmp = _mm_shuffle_ps(cmp, cmp, _MM_SHUFFLE(1, 0, 1, 0)); | |
| auto temp2 = _mm_blendv_ps(temp, v, cmp); | |
| // Second pass | |
| temp = _mm_shuffle_ps(temp2, temp2, _MM_SHUFFLE(2, 3, 0, 1)); | |
| cmp = _mm_cmplt_ps(temp2, temp); | |
| cmp = _mm_shuffle_ps(cmp, cmp, _MM_SHUFFLE(2, 0, 2, 0)); | |
| temp2 = _mm_blendv_ps(temp, temp2, cmp); | |
| // Third pass | |
| temp = _mm_shuffle_ps(temp2, temp2, _MM_SHUFFLE(3, 1, 2, 0)); | |
| cmp = _mm_cmplt_ps(temp2, temp); | |
| cmp = _mm_shuffle_ps(cmp, cmp, _MM_SHUFFLE(3, 1, 1, 0)); | |
| v = _mm_blendv_ps(temp, temp2, cmp); | |
| // Remove indices from input and return them | |
| auto ret = _mm_castps_si128(_mm_andnot_ps(mask, v)); | |
| return ret; | |
| } |
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