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 13 #include "./vp8_rtcd.h" 14 15 static const int16_t cospi8sqrt2minus1 = 20091; 16 // 35468 exceeds INT16_MAX and gets converted to a negative number. Because of 17 // the way it is used in vqdmulh, where the result is doubled, it can be divided 18 // by 2 beforehand. This saves compensating for the negative value as well as 19 // shifting the result. 20 static const int16_t sinpi8sqrt2 = 35468 >> 1; 21 22 void vp8_dequant_idct_add_neon(int16_t *input, int16_t *dq, unsigned char *dst, 23 int stride) { 24 unsigned char *dst0; 25 int32x2_t d14, d15; 26 int16x4_t d2, d3, d4, d5, d10, d11, d12, d13; 27 int16x8_t q1, q2, q3, q4, q5, q6; 28 int16x8_t qEmpty = vdupq_n_s16(0); 29 int32x2x2_t d2tmp0, d2tmp1; 30 int16x4x2_t d2tmp2, d2tmp3; 31 32 d14 = d15 = vdup_n_s32(0); 33 34 // load input 35 q3 = vld1q_s16(input); 36 vst1q_s16(input, qEmpty); 37 input += 8; 38 q4 = vld1q_s16(input); 39 vst1q_s16(input, qEmpty); 40 41 // load dq 42 q5 = vld1q_s16(dq); 43 dq += 8; 44 q6 = vld1q_s16(dq); 45 46 // load src from dst 47 dst0 = dst; 48 d14 = vld1_lane_s32((const int32_t *)dst0, d14, 0); 49 dst0 += stride; 50 d14 = vld1_lane_s32((const int32_t *)dst0, d14, 1); 51 dst0 += stride; 52 d15 = vld1_lane_s32((const int32_t *)dst0, d15, 0); 53 dst0 += stride; 54 d15 = vld1_lane_s32((const int32_t *)dst0, d15, 1); 55 56 q1 = vreinterpretq_s16_u16( 57 vmulq_u16(vreinterpretq_u16_s16(q3), vreinterpretq_u16_s16(q5))); 58 q2 = vreinterpretq_s16_u16( 59 vmulq_u16(vreinterpretq_u16_s16(q4), vreinterpretq_u16_s16(q6))); 60 61 d12 = vqadd_s16(vget_low_s16(q1), vget_low_s16(q2)); 62 d13 = vqsub_s16(vget_low_s16(q1), vget_low_s16(q2)); 63 64 q2 = vcombine_s16(vget_high_s16(q1), vget_high_s16(q2)); 65 66 q3 = vqdmulhq_n_s16(q2, sinpi8sqrt2); 67 q4 = vqdmulhq_n_s16(q2, cospi8sqrt2minus1); 68 69 q4 = vshrq_n_s16(q4, 1); 70 71 q4 = vqaddq_s16(q4, q2); 72 73 d10 = vqsub_s16(vget_low_s16(q3), vget_high_s16(q4)); 74 d11 = vqadd_s16(vget_high_s16(q3), vget_low_s16(q4)); 75 76 d2 = vqadd_s16(d12, d11); 77 d3 = vqadd_s16(d13, d10); 78 d4 = vqsub_s16(d13, d10); 79 d5 = vqsub_s16(d12, d11); 80 81 d2tmp0 = vtrn_s32(vreinterpret_s32_s16(d2), vreinterpret_s32_s16(d4)); 82 d2tmp1 = vtrn_s32(vreinterpret_s32_s16(d3), vreinterpret_s32_s16(d5)); 83 d2tmp2 = vtrn_s16(vreinterpret_s16_s32(d2tmp0.val[0]), 84 vreinterpret_s16_s32(d2tmp1.val[0])); 85 d2tmp3 = vtrn_s16(vreinterpret_s16_s32(d2tmp0.val[1]), 86 vreinterpret_s16_s32(d2tmp1.val[1])); 87 88 // loop 2 89 q2 = vcombine_s16(d2tmp2.val[1], d2tmp3.val[1]); 90 91 q3 = vqdmulhq_n_s16(q2, sinpi8sqrt2); 92 q4 = vqdmulhq_n_s16(q2, cospi8sqrt2minus1); 93 94 d12 = vqadd_s16(d2tmp2.val[0], d2tmp3.val[0]); 95 d13 = vqsub_s16(d2tmp2.val[0], d2tmp3.val[0]); 96 97 q4 = vshrq_n_s16(q4, 1); 98 99 q4 = vqaddq_s16(q4, q2); 100 101 d10 = vqsub_s16(vget_low_s16(q3), vget_high_s16(q4)); 102 d11 = vqadd_s16(vget_high_s16(q3), vget_low_s16(q4)); 103 104 d2 = vqadd_s16(d12, d11); 105 d3 = vqadd_s16(d13, d10); 106 d4 = vqsub_s16(d13, d10); 107 d5 = vqsub_s16(d12, d11); 108 109 d2 = vrshr_n_s16(d2, 3); 110 d3 = vrshr_n_s16(d3, 3); 111 d4 = vrshr_n_s16(d4, 3); 112 d5 = vrshr_n_s16(d5, 3); 113 114 d2tmp0 = vtrn_s32(vreinterpret_s32_s16(d2), vreinterpret_s32_s16(d4)); 115 d2tmp1 = vtrn_s32(vreinterpret_s32_s16(d3), vreinterpret_s32_s16(d5)); 116 d2tmp2 = vtrn_s16(vreinterpret_s16_s32(d2tmp0.val[0]), 117 vreinterpret_s16_s32(d2tmp1.val[0])); 118 d2tmp3 = vtrn_s16(vreinterpret_s16_s32(d2tmp0.val[1]), 119 vreinterpret_s16_s32(d2tmp1.val[1])); 120 121 q1 = vcombine_s16(d2tmp2.val[0], d2tmp2.val[1]); 122 q2 = vcombine_s16(d2tmp3.val[0], d2tmp3.val[1]); 123 124 q1 = vreinterpretq_s16_u16( 125 vaddw_u8(vreinterpretq_u16_s16(q1), vreinterpret_u8_s32(d14))); 126 q2 = vreinterpretq_s16_u16( 127 vaddw_u8(vreinterpretq_u16_s16(q2), vreinterpret_u8_s32(d15))); 128 129 d14 = vreinterpret_s32_u8(vqmovun_s16(q1)); 130 d15 = vreinterpret_s32_u8(vqmovun_s16(q2)); 131 132 dst0 = dst; 133 vst1_lane_s32((int32_t *)dst0, d14, 0); 134 dst0 += stride; 135 vst1_lane_s32((int32_t *)dst0, d14, 1); 136 dst0 += stride; 137 vst1_lane_s32((int32_t *)dst0, d15, 0); 138 dst0 += stride; 139 vst1_lane_s32((int32_t *)dst0, d15, 1); 140 return; 141 } 142
