ref: 1c07abca18d2e7f1868f085288b8ed7d98fdd2ed
dir: /vpx_dsp/x86/halfpix_variance_sse2.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <assert.h>
#include "./vpx_config.h"
#include "./vpx_dsp_rtcd.h"
#include "vpx/vpx_integer.h"
void vpx_half_horiz_vert_variance16x_h_sse2(const unsigned char *ref,
int ref_stride,
const unsigned char *src,
int src_stride, unsigned int height,
int *sum, unsigned int *sumsquared);
void vpx_half_horiz_variance16x_h_sse2(const unsigned char *ref, int ref_stride,
const unsigned char *src, int src_stride,
unsigned int height, int *sum,
unsigned int *sumsquared);
void vpx_half_vert_variance16x_h_sse2(const unsigned char *ref, int ref_stride,
const unsigned char *src, int src_stride,
unsigned int height, int *sum,
unsigned int *sumsquared);
uint32_t vpx_variance_halfpixvar16x16_h_sse2(const unsigned char *src,
int src_stride,
const unsigned char *dst,
int dst_stride, uint32_t *sse) {
int xsum0;
unsigned int xxsum0;
vpx_half_horiz_variance16x_h_sse2(src, src_stride, dst, dst_stride, 16,
&xsum0, &xxsum0);
*sse = xxsum0;
assert(xsum0 <= 255 * 16 * 16);
assert(xsum0 >= -255 * 16 * 16);
return (xxsum0 - ((uint32_t)((int64_t)xsum0 * xsum0) >> 8));
}
uint32_t vpx_variance_halfpixvar16x16_v_sse2(const unsigned char *src,
int src_stride,
const unsigned char *dst,
int dst_stride, uint32_t *sse) {
int xsum0;
unsigned int xxsum0;
vpx_half_vert_variance16x_h_sse2(src, src_stride, dst, dst_stride, 16, &xsum0,
&xxsum0);
*sse = xxsum0;
assert(xsum0 <= 255 * 16 * 16);
assert(xsum0 >= -255 * 16 * 16);
return (xxsum0 - ((uint32_t)((int64_t)xsum0 * xsum0) >> 8));
}
uint32_t vpx_variance_halfpixvar16x16_hv_sse2(const unsigned char *src,
int src_stride,
const unsigned char *dst,
int dst_stride, uint32_t *sse) {
int xsum0;
unsigned int xxsum0;
vpx_half_horiz_vert_variance16x_h_sse2(src, src_stride, dst, dst_stride, 16,
&xsum0, &xxsum0);
*sse = xxsum0;
assert(xsum0 <= 255 * 16 * 16);
assert(xsum0 >= -255 * 16 * 16);
return (xxsum0 - ((uint32_t)((int64_t)xsum0 * xsum0) >> 8));
}