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