1 /* 2 * Copyright (c) 2014 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include <arm_neon.h> 12 #include <assert.h> 13 14 #include "./vpx_dsp_rtcd.h" 15 #include "vpx_dsp/arm/idct_neon.h" 16 #include "vpx_dsp/arm/mem_neon.h" 17 #include "vpx_dsp/txfm_common.h" 18 19 void vpx_idct4x4_16_add_neon(const tran_low_t *input, uint8_t *dest, 20 int stride) { 21 const uint8_t *dst = dest; 22 const int16x4_t cospis = vld1_s16(kCospi); 23 uint8x8_t dest01_u8; 24 uint32x2_t dest32_u32 = vdup_n_u32(0); 25 int16x8_t a0, a1; 26 uint8x8_t d01, d32; 27 uint16x8_t d01_u16, d32_u16; 28 29 assert(!((intptr_t)dest % sizeof(uint32_t))); 30 assert(!(stride % sizeof(uint32_t))); 31 32 // Rows 33 a0 = load_tran_low_to_s16q(input); 34 a1 = load_tran_low_to_s16q(input + 8); 35 idct4x4_16_kernel_bd8(cospis, &a0, &a1); 36 37 // Columns 38 a1 = vcombine_s16(vget_high_s16(a1), vget_low_s16(a1)); 39 idct4x4_16_kernel_bd8(cospis, &a0, &a1); 40 a0 = vrshrq_n_s16(a0, 4); 41 a1 = vrshrq_n_s16(a1, 4); 42 43 dest01_u8 = load_u8(dst, stride); 44 dst += 2 * stride; 45 // The elements are loaded in reverse order. 46 dest32_u32 = vld1_lane_u32((const uint32_t *)dst, dest32_u32, 1); 47 dst += stride; 48 dest32_u32 = vld1_lane_u32((const uint32_t *)dst, dest32_u32, 0); 49 50 d01_u16 = vaddw_u8(vreinterpretq_u16_s16(a0), dest01_u8); 51 d32_u16 = 52 vaddw_u8(vreinterpretq_u16_s16(a1), vreinterpret_u8_u32(dest32_u32)); 53 d01 = vqmovun_s16(vreinterpretq_s16_u16(d01_u16)); 54 d32 = vqmovun_s16(vreinterpretq_s16_u16(d32_u16)); 55 56 store_u8(dest, stride, d01); 57 dest += 2 * stride; 58 // The elements are stored in reverse order. 59 vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d32), 1); 60 dest += stride; 61 vst1_lane_u32((uint32_t *)dest, vreinterpret_u32_u8(d32), 0); 62 } 63
