Commit dcac083c authored by Dmitry Kovalev's avatar Dmitry Kovalev

Implementing 4x4 variance calculation with SSE2.

New SSE2 function is three times faster than MMX one.

Change-Id: I4f387ce9f75b88379176ec7bdc62d86eb5f70fbe
parent e9d106bd
......@@ -8,6 +8,8 @@
* be found in the AUTHORS file in the root of the source tree.
*/
#include <emmintrin.h> // SSE2
#include "./vpx_config.h"
#include "vp9/encoder/vp9_variance.h"
......@@ -17,10 +19,37 @@ typedef unsigned int (*variance_fn_t) (const unsigned char *src, int src_stride,
const unsigned char *ref, int ref_stride,
unsigned int *sse, int *sum);
unsigned int vp9_get4x4var_mmx(const unsigned char *src, int src_stride,
const unsigned char *ref, int ref_stride,
unsigned int *sse, int *sum);
#define READ64(p, stride, i) \
_mm_unpacklo_epi8(_mm_cvtsi32_si128(*(const uint32_t *)(p + i * stride)), \
_mm_cvtsi32_si128(*(const uint32_t *)(p + (i + 1) * stride)))
unsigned int vp9_get4x4var_sse2(const uint8_t *src, int src_stride,
const uint8_t *ref, int ref_stride,
unsigned int *sse, int *sum) {
const __m128i zero = _mm_setzero_si128();
const __m128i src0 = _mm_unpacklo_epi8(READ64(src, src_stride, 0), zero);
const __m128i src1 = _mm_unpacklo_epi8(READ64(src, src_stride, 2), zero);
const __m128i ref0 = _mm_unpacklo_epi8(READ64(ref, ref_stride, 0), zero);
const __m128i ref1 = _mm_unpacklo_epi8(READ64(ref, ref_stride, 2), zero);
const __m128i diff0 = _mm_sub_epi16(src0, ref0);
const __m128i diff1 = _mm_sub_epi16(src1, ref1);
// sum
__m128i vsum = _mm_add_epi16(diff0, diff1);
vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 8));
vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 4));
vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 2));
*sum = (int16_t)_mm_extract_epi16(vsum, 0);
// sse
vsum = _mm_add_epi32(_mm_madd_epi16(diff0, diff0),
_mm_madd_epi16(diff1, diff1));
vsum = _mm_add_epi32(vsum, _mm_srli_si128(vsum, 8));
vsum = _mm_add_epi32(vsum, _mm_srli_si128(vsum, 4));
*sse = _mm_cvtsi128_si32(vsum);
return 0;
}
unsigned int vp9_get8x8var_sse2(const unsigned char *src, int src_stride,
const unsigned char *ref, int ref_stride,
......@@ -55,8 +84,7 @@ unsigned int vp9_variance4x4_sse2(const unsigned char *src, int src_stride,
const unsigned char *ref, int ref_stride,
unsigned int *sse) {
int sum;
variance_sse2(src, src_stride, ref, ref_stride, 4, 4,
sse, &sum, vp9_get4x4var_mmx, 4);
vp9_get4x4var_sse2(src, src_stride, ref, ref_stride, sse, &sum);
return *sse - (((unsigned int)sum * sum) >> 4);
}
......@@ -65,7 +93,7 @@ unsigned int vp9_variance8x4_sse2(const uint8_t *src, int src_stride,
unsigned int *sse) {
int sum;
variance_sse2(src, src_stride, ref, ref_stride, 8, 4,
sse, &sum, vp9_get4x4var_mmx, 4);
sse, &sum, vp9_get4x4var_sse2, 4);
return *sse - (((unsigned int)sum * sum) >> 5);
}
......@@ -74,7 +102,7 @@ unsigned int vp9_variance4x8_sse2(const uint8_t *src, int src_stride,
unsigned int *sse) {
int sum;
variance_sse2(src, src_stride, ref, ref_stride, 4, 8,
sse, &sum, vp9_get4x4var_mmx, 4);
sse, &sum, vp9_get4x4var_sse2, 4);
return *sse - (((unsigned int)sum * sum) >> 5);
}
......
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