ref: c79665d0ada48bc0253167d403e7f91a5e74d11d
dir: /vpx_dsp/arm/idct4x4_1_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 "vpx_dsp/inv_txfm.h" #include "vpx_ports/mem.h" void vpx_idct4x4_1_add_neon(int16_t *input, uint8_t *dest, int dest_stride) { uint8x8_t d6u8; uint32x2_t d2u32 = vdup_n_u32(0); uint16x8_t q8u16; int16x8_t q0s16; uint8_t *d1, *d2; int16_t i, a1, cospi_16_64 = 11585; int16_t out = dct_const_round_shift(input[0] * cospi_16_64); out = dct_const_round_shift(out * cospi_16_64); a1 = ROUND_POWER_OF_TWO(out, 4); q0s16 = vdupq_n_s16(a1); // dc_only_idct_add d1 = d2 = dest; for (i = 0; i < 2; i++) { d2u32 = vld1_lane_u32((const uint32_t *)d1, d2u32, 0); d1 += dest_stride; d2u32 = vld1_lane_u32((const uint32_t *)d1, d2u32, 1); d1 += dest_stride; q8u16 = vaddw_u8(vreinterpretq_u16_s16(q0s16), vreinterpret_u8_u32(d2u32)); d6u8 = vqmovun_s16(vreinterpretq_s16_u16(q8u16)); vst1_lane_u32((uint32_t *)d2, vreinterpret_u32_u8(d6u8), 0); d2 += dest_stride; vst1_lane_u32((uint32_t *)d2, vreinterpret_u32_u8(d6u8), 1); d2 += dest_stride; } return; }