42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
/*
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* Copyright (c) 2014 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <arm_neon.h>
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#include <assert.h>
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#include "./vpx_dsp_rtcd.h"
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#include "vpx_dsp/inv_txfm.h"
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void vpx_idct4x4_1_add_neon(const tran_low_t *input, uint8_t *dest,
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int stride) {
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int i;
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const int16_t out0 = dct_const_round_shift((int16_t)input[0] * cospi_16_64);
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const int16_t out1 = dct_const_round_shift(out0 * cospi_16_64);
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const int16_t a1 = ROUND_POWER_OF_TWO(out1, 4);
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const int16x8_t dc = vdupq_n_s16(a1);
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uint32x2_t d = vdup_n_u32(0);
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uint16x8_t a;
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uint8x8_t b;
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assert(!((intptr_t)dest % sizeof(uint32_t)));
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assert(!(stride % sizeof(uint32_t)));
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for (i = 0; i < 2; i++) {
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d = vld1_lane_u32((const uint32_t *)dest, d, 0);
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d = vld1_lane_u32((const uint32_t *)(dest + stride), d, 1);
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a = vaddw_u8(vreinterpretq_u16_s16(dc), vreinterpret_u8_u32(d));
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b = vqmovun_s16(vreinterpretq_s16_u16(a));
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vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(b), 0);
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dest += stride;
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vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(b), 1);
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dest += stride;
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}
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}
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