From b47631d785a798224dc42a9a66e310aa5716b977 Mon Sep 17 00:00:00 2001 From: Sebastian Frysztak Date: Fri, 11 Nov 2016 13:11:11 +0100 Subject: [PATCH] SSE2: resize filter to 7x7. clean up a little. --- blur_simd.c | 31 +++++++++++++------------------ 1 file changed, 13 insertions(+), 18 deletions(-) diff --git a/blur_simd.c b/blur_simd.c index 4bd1847..4bf4e38 100644 --- a/blur_simd.c +++ b/blur_simd.c @@ -14,7 +14,7 @@ #include #define ALIGN16 __attribute__((aligned(16))) -#define KERNEL_SIZE 15 +#define KERNEL_SIZE 7 #define HALF_KERNEL KERNEL_SIZE / 2 // number of xmm registers needed to store @@ -90,30 +90,25 @@ void blur_impl_horizontal_pass_sse2(uint32_t *src, uint32_t *dst, float *kernel, rgbaIn[k] = _mm_loadu_si128((__m128i*)(src + 4*k - HALF_KERNEL)); } - __m128i tmp; __m128i zero = _mm_setzero_si128(); __m128i acc = _mm_setzero_si128(); - for (int i = 0; i < 3; i++) - { - acc = _mm_add_epi16(acc, _mm_unpacklo_epi8(rgbaIn[i], zero)); - acc = _mm_add_epi16(acc, _mm_unpackhi_epi8(rgbaIn[i], zero)); - } - - acc = _mm_add_epi16(acc, _mm_unpacklo_epi8(rgbaIn[3], zero)); + acc = _mm_add_epi16(acc, _mm_unpacklo_epi8(rgbaIn[0], zero)); + acc = _mm_add_epi16(acc, _mm_unpackhi_epi8(rgbaIn[0], zero)); + acc = _mm_add_epi16(acc, _mm_unpacklo_epi8(rgbaIn[1], zero)); - tmp = _mm_unpackhi_epi8(rgbaIn[3], zero); - // set 16th pixel to zeroes - tmp = _mm_andnot_si128(_mm_set_epi16(0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0,0,0,0), tmp); - acc = _mm_add_epi16(acc, tmp); - acc = _mm_add_epi32(_mm_unpacklo_epi16(acc, zero), _mm_unpackhi_epi16(acc, zero)); + // kernel size equals to 7, but we can only load multiples of 4 pixels + // we have to set 8th pixel to zero + acc = _mm_add_epi16(acc, _mm_andnot_si128(_mm_set_epi32(0xFFFFFFFF, 0xFFFFFFFF, 0, 0), + _mm_unpackhi_epi8(rgbaIn[1], zero))); + acc = _mm_add_epi32(_mm_unpacklo_epi16(acc, zero), + _mm_unpackhi_epi16(acc, zero)); acc = _mm_cvtps_epi32(_mm_mul_ps(_mm_cvtepi32_ps(acc), - _mm_set1_ps(1/((float)(KERNEL_SIZE))))); + _mm_set1_ps(1/((float)KERNEL_SIZE)))); - acc = _mm_packs_epi32(acc, zero); - acc = _mm_packus_epi16(acc, zero); - *(dst + height * column + row) = _mm_cvtsi128_si32(acc); + *(dst + height * column + row) = + _mm_cvtsi128_si32(_mm_packus_epi16(_mm_packs_epi32(acc, zero), zero)); } } }