commit b47631d785a798224dc42a9a66e310aa5716b977
parent ab41586b3923e1cbab8a78ed21c4d9ec41981b26
Author: Sebastian Frysztak <sebfry@gmail.com>
Date: Fri, 11 Nov 2016 13:11:11 +0100
SSE2: resize filter to 7x7. clean up a little.
Diffstat:
1 file changed, 13 insertions(+), 18 deletions(-)
diff --git a/blur_simd.c b/blur_simd.c
@@ -14,7 +14,7 @@
#include <immintrin.h>
#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));
}
}
}
