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 static const int16_t cospi8sqrt2minus1 = 20091; 14 static const int16_t sinpi8sqrt2 = 17734; 15 // because the lowest bit in 0x8a8c is 0, we can pre-shift this 16 17 void idct_dequant_full_2x_neon( 18 int16_t *q, 19 int16_t *dq, 20 unsigned char *dst, 21 int stride) { 22 unsigned char *dst0, *dst1; 23 int32x2_t d28, d29, d30, d31; 24 int16x8_t q0, q1, q2, q3, q4, q5, q6, q7, q8, q9, q10, q11; 25 int16x8_t qEmpty = vdupq_n_s16(0); 26 int32x4x2_t q2tmp0, q2tmp1; 27 int16x8x2_t q2tmp2, q2tmp3; 28 int16x4_t dLow0, dLow1, dHigh0, dHigh1; 29 30 d28 = d29 = d30 = d31 = vdup_n_s32(0); 31 32 // load dq 33 q0 = vld1q_s16(dq); 34 dq += 8; 35 q1 = vld1q_s16(dq); 36 37 // load q 38 q2 = vld1q_s16(q); 39 vst1q_s16(q, qEmpty); 40 q += 8; 41 q3 = vld1q_s16(q); 42 vst1q_s16(q, qEmpty); 43 q += 8; 44 q4 = vld1q_s16(q); 45 vst1q_s16(q, qEmpty); 46 q += 8; 47 q5 = vld1q_s16(q); 48 vst1q_s16(q, qEmpty); 49 50 // load src from dst 51 dst0 = dst; 52 dst1 = dst + 4; 53 d28 = vld1_lane_s32((const int32_t *)dst0, d28, 0); 54 dst0 += stride; 55 d28 = vld1_lane_s32((const int32_t *)dst1, d28, 1); 56 dst1 += stride; 57 d29 = vld1_lane_s32((const int32_t *)dst0, d29, 0); 58 dst0 += stride; 59 d29 = vld1_lane_s32((const int32_t *)dst1, d29, 1); 60 dst1 += stride; 61 62 d30 = vld1_lane_s32((const int32_t *)dst0, d30, 0); 63 dst0 += stride; 64 d30 = vld1_lane_s32((const int32_t *)dst1, d30, 1); 65 dst1 += stride; 66 d31 = vld1_lane_s32((const int32_t *)dst0, d31, 0); 67 d31 = vld1_lane_s32((const int32_t *)dst1, d31, 1); 68 69 q2 = vmulq_s16(q2, q0); 70 q3 = vmulq_s16(q3, q1); 71 q4 = vmulq_s16(q4, q0); 72 q5 = vmulq_s16(q5, q1); 73 74 // vswp 75 dLow0 = vget_low_s16(q2); 76 dHigh0 = vget_high_s16(q2); 77 dLow1 = vget_low_s16(q4); 78 dHigh1 = vget_high_s16(q4); 79 q2 = vcombine_s16(dLow0, dLow1); 80 q4 = vcombine_s16(dHigh0, dHigh1); 81 82 dLow0 = vget_low_s16(q3); 83 dHigh0 = vget_high_s16(q3); 84 dLow1 = vget_low_s16(q5); 85 dHigh1 = vget_high_s16(q5); 86 q3 = vcombine_s16(dLow0, dLow1); 87 q5 = vcombine_s16(dHigh0, dHigh1); 88 89 q6 = vqdmulhq_n_s16(q4, sinpi8sqrt2); 90 q7 = vqdmulhq_n_s16(q5, sinpi8sqrt2); 91 q8 = vqdmulhq_n_s16(q4, cospi8sqrt2minus1); 92 q9 = vqdmulhq_n_s16(q5, cospi8sqrt2minus1); 93 94 q10 = vqaddq_s16(q2, q3); 95 q11 = vqsubq_s16(q2, q3); 96 97 q8 = vshrq_n_s16(q8, 1); 98 q9 = vshrq_n_s16(q9, 1); 99 100 q4 = vqaddq_s16(q4, q8); 101 q5 = vqaddq_s16(q5, q9); 102 103 q2 = vqsubq_s16(q6, q5); 104 q3 = vqaddq_s16(q7, q4); 105 106 q4 = vqaddq_s16(q10, q3); 107 q5 = vqaddq_s16(q11, q2); 108 q6 = vqsubq_s16(q11, q2); 109 q7 = vqsubq_s16(q10, q3); 110 111 q2tmp0 = vtrnq_s32(vreinterpretq_s32_s16(q4), vreinterpretq_s32_s16(q6)); 112 q2tmp1 = vtrnq_s32(vreinterpretq_s32_s16(q5), vreinterpretq_s32_s16(q7)); 113 q2tmp2 = vtrnq_s16(vreinterpretq_s16_s32(q2tmp0.val[0]), 114 vreinterpretq_s16_s32(q2tmp1.val[0])); 115 q2tmp3 = vtrnq_s16(vreinterpretq_s16_s32(q2tmp0.val[1]), 116 vreinterpretq_s16_s32(q2tmp1.val[1])); 117 118 // loop 2 119 q8 = vqdmulhq_n_s16(q2tmp2.val[1], sinpi8sqrt2); 120 q9 = vqdmulhq_n_s16(q2tmp3.val[1], sinpi8sqrt2); 121 q10 = vqdmulhq_n_s16(q2tmp2.val[1], cospi8sqrt2minus1); 122 q11 = vqdmulhq_n_s16(q2tmp3.val[1], cospi8sqrt2minus1); 123 124 q2 = vqaddq_s16(q2tmp2.val[0], q2tmp3.val[0]); 125 q3 = vqsubq_s16(q2tmp2.val[0], q2tmp3.val[0]); 126 127 q10 = vshrq_n_s16(q10, 1); 128 q11 = vshrq_n_s16(q11, 1); 129 130 q10 = vqaddq_s16(q2tmp2.val[1], q10); 131 q11 = vqaddq_s16(q2tmp3.val[1], q11); 132 133 q8 = vqsubq_s16(q8, q11); 134 q9 = vqaddq_s16(q9, q10); 135 136 q4 = vqaddq_s16(q2, q9); 137 q5 = vqaddq_s16(q3, q8); 138 q6 = vqsubq_s16(q3, q8); 139 q7 = vqsubq_s16(q2, q9); 140 141 q4 = vrshrq_n_s16(q4, 3); 142 q5 = vrshrq_n_s16(q5, 3); 143 q6 = vrshrq_n_s16(q6, 3); 144 q7 = vrshrq_n_s16(q7, 3); 145 146 q2tmp0 = vtrnq_s32(vreinterpretq_s32_s16(q4), vreinterpretq_s32_s16(q6)); 147 q2tmp1 = vtrnq_s32(vreinterpretq_s32_s16(q5), vreinterpretq_s32_s16(q7)); 148 q2tmp2 = vtrnq_s16(vreinterpretq_s16_s32(q2tmp0.val[0]), 149 vreinterpretq_s16_s32(q2tmp1.val[0])); 150 q2tmp3 = vtrnq_s16(vreinterpretq_s16_s32(q2tmp0.val[1]), 151 vreinterpretq_s16_s32(q2tmp1.val[1])); 152 153 q4 = vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(q2tmp2.val[0]), 154 vreinterpret_u8_s32(d28))); 155 q5 = vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(q2tmp2.val[1]), 156 vreinterpret_u8_s32(d29))); 157 q6 = vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(q2tmp3.val[0]), 158 vreinterpret_u8_s32(d30))); 159 q7 = vreinterpretq_s16_u16(vaddw_u8(vreinterpretq_u16_s16(q2tmp3.val[1]), 160 vreinterpret_u8_s32(d31))); 161 162 d28 = vreinterpret_s32_u8(vqmovun_s16(q4)); 163 d29 = vreinterpret_s32_u8(vqmovun_s16(q5)); 164 d30 = vreinterpret_s32_u8(vqmovun_s16(q6)); 165 d31 = vreinterpret_s32_u8(vqmovun_s16(q7)); 166 167 dst0 = dst; 168 dst1 = dst + 4; 169 vst1_lane_s32((int32_t *)dst0, d28, 0); 170 dst0 += stride; 171 vst1_lane_s32((int32_t *)dst1, d28, 1); 172 dst1 += stride; 173 vst1_lane_s32((int32_t *)dst0, d29, 0); 174 dst0 += stride; 175 vst1_lane_s32((int32_t *)dst1, d29, 1); 176 dst1 += stride; 177 178 vst1_lane_s32((int32_t *)dst0, d30, 0); 179 dst0 += stride; 180 vst1_lane_s32((int32_t *)dst1, d30, 1); 181 dst1 += stride; 182 vst1_lane_s32((int32_t *)dst0, d31, 0); 183 vst1_lane_s32((int32_t *)dst1, d31, 1); 184 return; 185 } 186 187 int main() 188 { 189 } 190
