ref: cf75ab6ccd8d100208bf2140b0d68f4669416358
dir: /vpx_dsp/arm/fdct_partial_neon.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 <arm_neon.h>
#include "./vpx_dsp_rtcd.h"
#include "./vpx_config.h"
void vpx_fdct8x8_1_neon(const int16_t *input, tran_low_t *output, int stride) {
int r;
int16x8_t sum = vld1q_s16(&input[0]);
for (r = 1; r < 8; ++r) {
const int16x8_t input_00 = vld1q_s16(&input[r * stride]);
sum = vaddq_s16(sum, input_00);
}
{
const int32x4_t a = vpaddlq_s16(sum);
const int64x2_t b = vpaddlq_s32(a);
const int32x2_t c = vadd_s32(vreinterpret_s32_s64(vget_low_s64(b)),
vreinterpret_s32_s64(vget_high_s64(b)));
#if CONFIG_VP9_HIGHBITDEPTH
output[0] = vget_lane_s32(c, 0);
#else
output[0] = vget_lane_s16(vreinterpret_s16_s32(c), 0);
#endif
output[1] = 0;
}
}