ref: 0acc7365abf97214a045c14f66e5934884395e6d
dir: /vpx_dsp/arm/idct4x4_add_neon.c/
/* * Copyright (c) 2014 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 <assert.h> #include "./vpx_dsp_rtcd.h" #include "vpx_dsp/arm/idct_neon.h" #include "vpx_dsp/arm/mem_neon.h" #include "vpx_dsp/txfm_common.h" void vpx_idct4x4_16_add_neon(const tran_low_t *input, uint8_t *dest, int stride) { const uint8_t *dst = dest; uint32x2_t s32 = vdup_n_u32(0); int16x8_t a[2]; uint8x8_t s, d[2]; uint16x8_t sum[2]; assert(!((intptr_t)dest % sizeof(uint32_t))); assert(!(stride % sizeof(uint32_t))); // Rows a[0] = load_tran_low_to_s16q(input); a[1] = load_tran_low_to_s16q(input + 8); transpose_idct4x4_16_bd8(a); // Columns a[1] = vcombine_s16(vget_high_s16(a[1]), vget_low_s16(a[1])); transpose_idct4x4_16_bd8(a); a[0] = vrshrq_n_s16(a[0], 4); a[1] = vrshrq_n_s16(a[1], 4); s = load_u8(dst, stride); dst += 2 * stride; // The elements are loaded in reverse order. s32 = vld1_lane_u32((const uint32_t *)dst, s32, 1); dst += stride; s32 = vld1_lane_u32((const uint32_t *)dst, s32, 0); sum[0] = vaddw_u8(vreinterpretq_u16_s16(a[0]), s); sum[1] = vaddw_u8(vreinterpretq_u16_s16(a[1]), vreinterpret_u8_u32(s32)); d[0] = vqmovun_s16(vreinterpretq_s16_u16(sum[0])); d[1] = vqmovun_s16(vreinterpretq_s16_u16(sum[1])); store_u8(dest, stride, d[0]); dest += 2 * stride; // The elements are stored in reverse order. vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d[1]), 1); dest += stride; vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d[1]), 0); }