ref: 5881601488ef4278d7ca2b06e2ad4d44b3063620
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 <assert.h> #include "./vpx_dsp_rtcd.h" #include "vpx_dsp/inv_txfm.h" static INLINE void idct4x4_1_add_kernel(uint8_t **dest, const int stride, const int16x8_t res, uint32x2_t *const d) { uint16x8_t a; uint8x8_t b; *d = vld1_lane_u32((const uint32_t *)*dest, *d, 0); *d = vld1_lane_u32((const uint32_t *)(*dest + stride), *d, 1); a = vaddw_u8(vreinterpretq_u16_s16(res), vreinterpret_u8_u32(*d)); b = vqmovun_s16(vreinterpretq_s16_u16(a)); vst1_lane_u32((uint32_t *)*dest, vreinterpret_u32_u8(b), 0); *dest += stride; vst1_lane_u32((uint32_t *)*dest, vreinterpret_u32_u8(b), 1); *dest += stride; } void vpx_idct4x4_1_add_neon(const tran_low_t *input, uint8_t *dest, int stride) { const int16_t out0 = WRAPLOW(dct_const_round_shift(input[0] * cospi_16_64)); const int16_t out1 = WRAPLOW(dct_const_round_shift(out0 * cospi_16_64)); const int16_t a1 = ROUND_POWER_OF_TWO(out1, 4); const int16x8_t dc = vdupq_n_s16(a1); uint32x2_t d = vdup_n_u32(0); assert(!((intptr_t)dest % sizeof(uint32_t))); assert(!(stride % sizeof(uint32_t))); idct4x4_1_add_kernel(&dest, stride, dc, &d); idct4x4_1_add_kernel(&dest, stride, dc, &d); }