| 1 | /* |
| 2 | * Copyright (c) 2012 Mans Rullgard <mans@mansr.com> |
| 3 | * |
| 4 | * This file is part of FFmpeg |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #include "libavutil/arm/asm.S" |
| 22 | |
| 23 | function flac_lpc_16_1_arm |
| 24 | ldr r12, [sp] |
| 25 | push {r4, lr} |
| 26 | ldr r1, [r1] |
| 27 | subs r12, r12, #2 |
| 28 | ldr lr, [r0], #4 |
| 29 | beq 2f |
| 30 | it lt |
| 31 | poplt {r4, pc} |
| 32 | 1: |
| 33 | mul r4, lr, r1 |
| 34 | ldm r0, {r2, lr} |
| 35 | add_sh r2, r2, r4, asr r3 |
| 36 | mul r4, r2, r1 |
| 37 | subs r12, r12, #2 |
| 38 | add_sh lr, lr, r4, asr r3 |
| 39 | stm r0!, {r2, lr} |
| 40 | bgt 1b |
| 41 | it lt |
| 42 | poplt {r4, pc} |
| 43 | 2: |
| 44 | mul r4, lr, r1 |
| 45 | ldr r2, [r0] |
| 46 | add_sh r2, r2, r4, asr r3 |
| 47 | str r2, [r0] |
| 48 | pop {r4, pc} |
| 49 | endfunc |
| 50 | |
| 51 | function flac_lpc_16_2_arm |
| 52 | ldr r12, [sp] |
| 53 | subs r12, r12, r2 |
| 54 | it le |
| 55 | bxle lr |
| 56 | |
| 57 | push {r4-r9, lr} |
| 58 | ldm r0!, {r6, r7} |
| 59 | ldm r1, {r8, r9} |
| 60 | subs r12, r12, #1 |
| 61 | beq 2f |
| 62 | 1: |
| 63 | mul r4, r6, r8 |
| 64 | mul r5, r7, r8 |
| 65 | mla r4, r7, r9, r4 |
| 66 | ldm r0, {r6, r7} |
| 67 | add_sh r6, r6, r4, asr r3 |
| 68 | mla r5, r6, r9, r5 |
| 69 | add_sh r7, r7, r5, asr r3 |
| 70 | stm r0!, {r6, r7} |
| 71 | subs r12, r12, #2 |
| 72 | bgt 1b |
| 73 | it lt |
| 74 | poplt {r4-r9, pc} |
| 75 | 2: |
| 76 | mul r4, r6, r8 |
| 77 | mla r4, r7, r9, r4 |
| 78 | ldr r5, [r0] |
| 79 | add_sh r5, r5, r4, asr r3 |
| 80 | str r5, [r0] |
| 81 | pop {r4-r9, pc} |
| 82 | endfunc |
| 83 | |
| 84 | function ff_flac_lpc_16_arm, export=1 |
| 85 | cmp r2, #2 |
| 86 | blt flac_lpc_16_1_arm |
| 87 | beq flac_lpc_16_2_arm |
| 88 | |
| 89 | ldr r12, [sp] |
| 90 | subs r12, r12, r2 |
| 91 | it le |
| 92 | bxle lr |
| 93 | |
| 94 | push {r4-r9, lr} |
| 95 | |
| 96 | subs r12, r12, #1 |
| 97 | beq 3f |
| 98 | 1: |
| 99 | sub lr, r2, #2 |
| 100 | mov r4, #0 |
| 101 | mov r5, #0 |
| 102 | |
| 103 | ldr r7, [r0], #4 |
| 104 | ldr r9, [r1], #4 |
| 105 | 2: |
| 106 | mla r4, r7, r9, r4 |
| 107 | ldm r0!, {r6, r7} |
| 108 | mla r5, r6, r9, r5 |
| 109 | ldm r1!, {r8, r9} |
| 110 | mla r4, r6, r8, r4 |
| 111 | subs lr, lr, #2 |
| 112 | mla r5, r7, r8, r5 |
| 113 | bgt 2b |
| 114 | blt 6f |
| 115 | |
| 116 | mla r4, r7, r9, r4 |
| 117 | ldr r7, [r0], #4 |
| 118 | mla r5, r7, r9, r5 |
| 119 | ldr r9, [r1], #4 |
| 120 | 6: |
| 121 | mla r4, r7, r9, r4 |
| 122 | ldm r0, {r6, r7} |
| 123 | add_sh r6, r6, r4, asr r3 |
| 124 | mla r5, r6, r9, r5 |
| 125 | add_sh r7, r7, r5, asr r3 |
| 126 | stm r0!, {r6, r7} |
| 127 | sub r0, r0, r2, lsl #2 |
| 128 | sub r1, r1, r2, lsl #2 |
| 129 | |
| 130 | subs r12, r12, #2 |
| 131 | bgt 1b |
| 132 | it lt |
| 133 | poplt {r4-r9, pc} |
| 134 | 3: |
| 135 | mov r4, #0 |
| 136 | 4: |
| 137 | ldr r5, [r1], #4 |
| 138 | ldr r6, [r0], #4 |
| 139 | mla r4, r5, r6, r4 |
| 140 | subs r2, r2, #1 |
| 141 | bgt 4b |
| 142 | ldr r5, [r0] |
| 143 | add_sh r5, r5, r4, asr r3 |
| 144 | str r5, [r0] |
| 145 | pop {r4-r9, pc} |
| 146 | endfunc |