ref: 5d011cb2785016de7f1cbf9a284cdd768a8a6229
dir: /vp8/common/arm/neon/idct_dequant_0_2x_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> void idct_dequant_0_2x_neon( int16_t *q, int16_t dq, unsigned char *dst, int stride) { unsigned char *dst0; int i, a0, a1; int16x8x2_t q2Add; int32x2_t d2s32 = vdup_n_s32(0), d4s32 = vdup_n_s32(0); uint8x8_t d2u8, d4u8; uint16x8_t q1u16, q2u16; a0 = ((q[0] * dq) + 4) >> 3; a1 = ((q[16] * dq) + 4) >> 3; q[0] = q[16] = 0; q2Add.val[0] = vdupq_n_s16((int16_t)a0); q2Add.val[1] = vdupq_n_s16((int16_t)a1); for (i = 0; i < 2; i++, dst += 4) { dst0 = dst; d2s32 = vld1_lane_s32((const int32_t *)dst0, d2s32, 0); dst0 += stride; d2s32 = vld1_lane_s32((const int32_t *)dst0, d2s32, 1); dst0 += stride; d4s32 = vld1_lane_s32((const int32_t *)dst0, d4s32, 0); dst0 += stride; d4s32 = vld1_lane_s32((const int32_t *)dst0, d4s32, 1); q1u16 = vaddw_u8(vreinterpretq_u16_s16(q2Add.val[i]), vreinterpret_u8_s32(d2s32)); q2u16 = vaddw_u8(vreinterpretq_u16_s16(q2Add.val[i]), vreinterpret_u8_s32(d4s32)); d2u8 = vqmovun_s16(vreinterpretq_s16_u16(q1u16)); d4u8 = vqmovun_s16(vreinterpretq_s16_u16(q2u16)); d2s32 = vreinterpret_s32_u8(d2u8); d4s32 = vreinterpret_s32_u8(d4u8); dst0 = dst; vst1_lane_s32((int32_t *)dst0, d2s32, 0); dst0 += stride; vst1_lane_s32((int32_t *)dst0, d2s32, 1); dst0 += stride; vst1_lane_s32((int32_t *)dst0, d4s32, 0); dst0 += stride; vst1_lane_s32((int32_t *)dst0, d4s32, 1); } return; }