andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 1 | @ |
| 2 | @ Copyright (c) 2012 The WebRTC 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 | @ This file contains some minimum and maximum functions, optimized for |
| 12 | @ ARM Neon platform. The description header can be found in |
| 13 | @ signal_processing_library.h |
| 14 | @ |
| 15 | @ The reference C code is in file min_max_operations.c. Code here is basically |
| 16 | @ a loop unrolling by 8 with Neon instructions. Bit-exact. |
| 17 | |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 18 | #include "webrtc/system_wrappers/interface/asm_defines.h" |
| 19 | |
| 20 | GLOBAL_FUNCTION WebRtcSpl_MaxAbsValueW16Neon |
| 21 | GLOBAL_FUNCTION WebRtcSpl_MaxAbsValueW32Neon |
| 22 | GLOBAL_FUNCTION WebRtcSpl_MaxValueW16Neon |
| 23 | GLOBAL_FUNCTION WebRtcSpl_MaxValueW32Neon |
| 24 | GLOBAL_FUNCTION WebRtcSpl_MinValueW16Neon |
| 25 | GLOBAL_FUNCTION WebRtcSpl_MinValueW32Neon |
| 26 | |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 27 | .align 2 |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 28 | @ int16_t WebRtcSpl_MaxAbsValueW16Neon(const int16_t* vector, int length); |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 29 | DEFINE_FUNCTION WebRtcSpl_MaxAbsValueW16Neon |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 30 | mov r2, #-1 @ Initialize the return value. |
| 31 | cmp r0, #0 |
| 32 | beq END_MAX_ABS_VALUE_W16 |
| 33 | cmp r1, #0 |
| 34 | ble END_MAX_ABS_VALUE_W16 |
| 35 | |
| 36 | cmp r1, #8 |
| 37 | blt LOOP_MAX_ABS_VALUE_W16 |
| 38 | |
| 39 | vmov.i16 q12, #0 |
| 40 | sub r1, #8 @ Counter for loops |
| 41 | |
| 42 | LOOP_UNROLLED_BY_8_MAX_ABS_VALUE_W16: |
| 43 | vld1.16 {q13}, [r0]! |
| 44 | subs r1, #8 |
| 45 | vabs.s16 q13, q13 @ Note vabs doesn't change the value of -32768. |
| 46 | vmax.u16 q12, q13 @ Use u16 so we don't lose the value -32768. |
| 47 | bge LOOP_UNROLLED_BY_8_MAX_ABS_VALUE_W16 |
| 48 | |
| 49 | @ Find the maximum value in the Neon registers and move it to r2. |
| 50 | vmax.u16 d24, d25 |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 51 | vpmax.u16 d24, d24, d24 |
| 52 | vpmax.u16 d24, d24, d24 |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 53 | adds r1, #8 |
| 54 | vmov.u16 r2, d24[0] |
| 55 | beq END_MAX_ABS_VALUE_W16 |
| 56 | |
| 57 | LOOP_MAX_ABS_VALUE_W16: |
| 58 | ldrsh r3, [r0], #2 |
| 59 | eor r12, r3, r3, asr #31 @ eor and then sub, to get absolute value. |
| 60 | sub r12, r12, r3, asr #31 |
| 61 | cmp r2, r12 |
| 62 | movlt r2, r12 |
| 63 | subs r1, #1 |
| 64 | bne LOOP_MAX_ABS_VALUE_W16 |
| 65 | |
| 66 | END_MAX_ABS_VALUE_W16: |
| 67 | cmp r2, #0x8000 @ Guard against the case for -32768. |
| 68 | subeq r2, #1 |
| 69 | mov r0, r2 |
| 70 | bx lr |
| 71 | |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 72 | |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 73 | |
| 74 | @ int32_t WebRtcSpl_MaxAbsValueW32Neon(const int32_t* vector, int length); |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 75 | DEFINE_FUNCTION WebRtcSpl_MaxAbsValueW32Neon |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 76 | cmp r0, #0 |
| 77 | moveq r0, #-1 |
| 78 | beq EXIT @ Return -1 for a NULL pointer. |
| 79 | cmp r1, #0 @ length |
| 80 | movle r0, #-1 |
| 81 | ble EXIT @ Return -1 if length <= 0. |
| 82 | |
| 83 | vmov.i32 q11, #0 |
| 84 | vmov.i32 q12, #0 |
| 85 | cmp r1, #8 |
| 86 | blt LOOP_MAX_ABS_VALUE_W32 |
| 87 | |
| 88 | sub r1, #8 @ Counter for loops |
| 89 | |
| 90 | LOOP_UNROLLED_BY_8_MAX_ABS_VALUE_W32: |
| 91 | vld1.32 {q13, q14}, [r0]! |
| 92 | subs r1, #8 @ Counter for loops |
| 93 | vabs.s32 q13, q13 @ vabs doesn't change the value of 0x80000000. |
| 94 | vabs.s32 q14, q14 |
| 95 | vmax.u32 q11, q13 @ Use u32 so we don't lose the value 0x80000000. |
| 96 | vmax.u32 q12, q14 |
| 97 | bge LOOP_UNROLLED_BY_8_MAX_ABS_VALUE_W32 |
| 98 | |
| 99 | @ Find the maximum value in the Neon registers and move it to r2. |
| 100 | vmax.u32 q12, q11 |
| 101 | vmax.u32 d24, d25 |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 102 | vpmax.u32 d24, d24, d24 |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 103 | adds r1, #8 |
| 104 | vmov.u32 r2, d24[0] |
| 105 | beq END_MAX_ABS_VALUE_W32 |
| 106 | |
| 107 | LOOP_MAX_ABS_VALUE_W32: |
| 108 | ldr r3, [r0], #4 |
| 109 | eor r12, r3, r3, asr #31 @ eor and then sub, to get absolute value. |
| 110 | sub r12, r12, r3, asr #31 |
| 111 | cmp r2, r12 |
| 112 | movcc r2, r12 |
| 113 | subs r1, #1 |
| 114 | bne LOOP_MAX_ABS_VALUE_W32 |
| 115 | |
| 116 | END_MAX_ABS_VALUE_W32: |
| 117 | mvn r0, #0x80000000 @ Guard against the case for 0x80000000. |
| 118 | cmp r2, r0 |
| 119 | movcc r0, r2 |
| 120 | |
| 121 | EXIT: |
| 122 | bx lr |
| 123 | |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 124 | @ int16_t WebRtcSpl_MaxValueW16Neon(const int16_t* vector, int length); |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 125 | DEFINE_FUNCTION WebRtcSpl_MaxValueW16Neon |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 126 | mov r2, #0x8000 @ Initialize the return value. |
| 127 | cmp r0, #0 |
| 128 | beq END_MAX_VALUE_W16 |
| 129 | cmp r1, #0 |
| 130 | ble END_MAX_VALUE_W16 |
| 131 | |
| 132 | vmov.i16 q12, #0x8000 |
| 133 | cmp r1, #8 |
| 134 | blt LOOP_MAX_VALUE_W16 |
| 135 | |
| 136 | sub r1, #8 @ Counter for loops |
| 137 | |
| 138 | LOOP_UNROLLED_BY_8_MAX_VALUE_W16: |
| 139 | vld1.16 {q13}, [r0]! |
| 140 | subs r1, #8 |
| 141 | vmax.s16 q12, q13 |
| 142 | bge LOOP_UNROLLED_BY_8_MAX_VALUE_W16 |
| 143 | |
| 144 | @ Find the maximum value in the Neon registers and move it to r2. |
| 145 | vmax.s16 d24, d25 |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 146 | vpmax.s16 d24, d24, d24 |
| 147 | vpmax.s16 d24, d24, d24 |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 148 | adds r1, #8 |
| 149 | vmov.u16 r2, d24[0] |
| 150 | beq END_MAX_VALUE_W16 |
| 151 | |
| 152 | LOOP_MAX_VALUE_W16: |
| 153 | ldrsh r3, [r0], #2 |
| 154 | cmp r2, r3 |
| 155 | movlt r2, r3 |
| 156 | subs r1, #1 |
| 157 | bne LOOP_MAX_VALUE_W16 |
| 158 | |
| 159 | END_MAX_VALUE_W16: |
| 160 | mov r0, r2 |
| 161 | bx lr |
| 162 | |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 163 | @ int32_t WebRtcSpl_MaxValueW32Neon(const int32_t* vector, int length); |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 164 | DEFINE_FUNCTION WebRtcSpl_MaxValueW32Neon |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 165 | mov r2, #0x80000000 @ Initialize the return value. |
| 166 | cmp r0, #0 |
| 167 | beq END_MAX_VALUE_W32 |
| 168 | cmp r1, #0 |
| 169 | ble END_MAX_VALUE_W32 |
| 170 | |
| 171 | vmov.i32 q11, #0x80000000 |
| 172 | vmov.i32 q12, #0x80000000 |
| 173 | cmp r1, #8 |
| 174 | blt LOOP_MAX_VALUE_W32 |
| 175 | |
| 176 | sub r1, #8 @ Counter for loops |
| 177 | |
| 178 | LOOP_UNROLLED_BY_8_MAX_VALUE_W32: |
| 179 | vld1.32 {q13, q14}, [r0]! |
| 180 | subs r1, #8 |
| 181 | vmax.s32 q11, q13 |
| 182 | vmax.s32 q12, q14 |
| 183 | bge LOOP_UNROLLED_BY_8_MAX_VALUE_W32 |
| 184 | |
| 185 | @ Find the maximum value in the Neon registers and move it to r2. |
| 186 | vmax.s32 q12, q11 |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 187 | vpmax.s32 d24, d24, d25 |
| 188 | vpmax.s32 d24, d24, d24 |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 189 | adds r1, #8 |
| 190 | vmov.s32 r2, d24[0] |
| 191 | beq END_MAX_VALUE_W32 |
| 192 | |
| 193 | LOOP_MAX_VALUE_W32: |
| 194 | ldr r3, [r0], #4 |
| 195 | cmp r2, r3 |
| 196 | movlt r2, r3 |
| 197 | subs r1, #1 |
| 198 | bne LOOP_MAX_VALUE_W32 |
| 199 | |
| 200 | END_MAX_VALUE_W32: |
| 201 | mov r0, r2 |
| 202 | bx lr |
| 203 | |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 204 | @ int16_t WebRtcSpl_MinValueW16Neon(const int16_t* vector, int length); |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 205 | DEFINE_FUNCTION WebRtcSpl_MinValueW16Neon |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 206 | movw r2, #0x7FFF @ Initialize the return value. |
| 207 | cmp r0, #0 |
| 208 | beq END_MIN_VALUE_W16 |
| 209 | cmp r1, #0 |
| 210 | ble END_MIN_VALUE_W16 |
| 211 | |
| 212 | vmov.i16 q12, #0x7FFF |
| 213 | cmp r1, #8 |
| 214 | blt LOOP_MIN_VALUE_W16 |
| 215 | |
| 216 | sub r1, #8 @ Counter for loops |
| 217 | |
| 218 | LOOP_UNROLLED_BY_8_MIN_VALUE_W16: |
| 219 | vld1.16 {q13}, [r0]! |
| 220 | subs r1, #8 |
| 221 | vmin.s16 q12, q13 |
| 222 | bge LOOP_UNROLLED_BY_8_MIN_VALUE_W16 |
| 223 | |
| 224 | @ Find the maximum value in the Neon registers and move it to r2. |
| 225 | vmin.s16 d24, d25 |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 226 | vpmin.s16 d24, d24, d24 |
| 227 | vpmin.s16 d24, d24, d24 |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 228 | adds r1, #8 |
| 229 | vmov.s16 r2, d24[0] |
| 230 | sxth r2, r2 |
| 231 | beq END_MIN_VALUE_W16 |
| 232 | |
| 233 | LOOP_MIN_VALUE_W16: |
| 234 | ldrsh r3, [r0], #2 |
| 235 | cmp r2, r3 |
| 236 | movge r2, r3 |
| 237 | subs r1, #1 |
| 238 | bne LOOP_MIN_VALUE_W16 |
| 239 | |
| 240 | END_MIN_VALUE_W16: |
| 241 | mov r0, r2 |
| 242 | bx lr |
| 243 | |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 244 | @ int32_t WebRtcSpl_MinValueW32Neon(const int32_t* vector, int length); |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 245 | DEFINE_FUNCTION WebRtcSpl_MinValueW32Neon |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 246 | mov r2, #0x7FFFFFFF @ Initialize the return value. |
| 247 | cmp r0, #0 |
| 248 | beq END_MIN_VALUE_W32 |
| 249 | cmp r1, #0 |
| 250 | ble END_MIN_VALUE_W32 |
| 251 | |
| 252 | vdup.32 q11, r2 |
| 253 | vdup.32 q12, r2 |
| 254 | cmp r1, #8 |
| 255 | blt LOOP_MIN_VALUE_W32 |
| 256 | |
| 257 | sub r1, #8 @ Counter for loops |
| 258 | |
| 259 | LOOP_UNROLLED_BY_8_MIN_VALUE_W32: |
| 260 | vld1.32 {q13, q14}, [r0]! |
| 261 | subs r1, #8 |
| 262 | vmin.s32 q11, q13 |
| 263 | vmin.s32 q12, q14 |
| 264 | bge LOOP_UNROLLED_BY_8_MIN_VALUE_W32 |
| 265 | |
| 266 | @ Find the maximum value in the Neon registers and move it to r2. |
| 267 | vmin.s32 q12, q11 |
kma@webrtc.org | 9fc6250 | 2012-11-17 00:22:46 +0000 | [diff] [blame] | 268 | vpmin.s32 d24, d24, d25 |
| 269 | vpmin.s32 d24, d24, d24 |
andrew@webrtc.org | a7b57da | 2012-10-22 18:19:23 +0000 | [diff] [blame] | 270 | adds r1, #8 |
| 271 | vmov.s32 r2, d24[0] |
| 272 | beq END_MIN_VALUE_W32 |
| 273 | |
| 274 | LOOP_MIN_VALUE_W32: |
| 275 | ldr r3, [r0], #4 |
| 276 | cmp r2, r3 |
| 277 | movge r2, r3 |
| 278 | subs r1, #1 |
| 279 | bne LOOP_MIN_VALUE_W32 |
| 280 | |
| 281 | END_MIN_VALUE_W32: |
| 282 | mov r0, r2 |
| 283 | bx lr |