ref: cc7f0c0f3e168b31d4b5e5f42e0a368fa24ff62a
dir: /vpx_dsp/ppc/sad_vsx.c/
/*
* Copyright (c) 2017 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 <stdlib.h>
#include "vpx_dsp/ppc/types_vsx.h"
#include "vpx/vpx_integer.h"
#define PROCESS16(offset) \
v_a = vec_vsx_ld(offset, a); \
v_b = vec_vsx_ld(offset, b); \
v_ah = unpack_to_s16_h(v_a); \
v_al = unpack_to_s16_l(v_a); \
v_bh = unpack_to_s16_h(v_b); \
v_bl = unpack_to_s16_l(v_b); \
v_subh = vec_sub(v_ah, v_bh); \
v_subl = vec_sub(v_al, v_bl); \
v_absh = vec_abs(v_subh); \
v_absl = vec_abs(v_subl); \
v_sad = vec_sum4s(v_absh, v_sad); \
v_sad = vec_sum4s(v_absl, v_sad);
#define SAD16(height) \
unsigned int vpx_sad16x##height##_vsx(const uint8_t *a, int a_stride, \
const uint8_t *b, int b_stride) { \
int y; \
unsigned int sad[4]; \
uint8x16_t v_a, v_b; \
int16x8_t v_ah, v_al, v_bh, v_bl, v_absh, v_absl, v_subh, v_subl; \
int32x4_t v_sad = vec_splat_s32(0); \
\
for (y = 0; y < height; y++) { \
PROCESS16(0); \
\
a += a_stride; \
b += b_stride; \
} \
vec_vsx_st((uint32x4_t)v_sad, 0, sad); \
\
return sad[3] + sad[2] + sad[1] + sad[0]; \
}
SAD16(8);
SAD16(16);
SAD16(32);