Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Optimization of some functions from mpegvideo.c for armv5te |
||
| 3 | * Copyright (c) 2007 Siarhei Siamashka |
||
| 4 | * |
||
| 5 | * This file is part of FFmpeg. |
||
| 6 | * |
||
| 7 | * FFmpeg is free software; you can redistribute it and/or |
||
| 8 | * modify it under the terms of the GNU Lesser General Public |
||
| 9 | * License as published by the Free Software Foundation; either |
||
| 10 | * version 2.1 of the License, or (at your option) any later version. |
||
| 11 | * |
||
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
||
| 15 | * Lesser General Public License for more details. |
||
| 16 | * |
||
| 17 | * You should have received a copy of the GNU Lesser General Public |
||
| 18 | * License along with FFmpeg; if not, write to the Free Software |
||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||
| 20 | */ |
||
| 21 | |||
| 22 | #include "config.h" |
||
| 23 | #include "libavutil/arm/asm.S" |
||
| 24 | |||
| 25 | /* |
||
| 26 | * Special optimized version of dct_unquantize_h263_helper_c, it |
||
| 27 | * requires the block to be at least 8 bytes aligned, and may process |
||
| 28 | * more elements than requested. But it is guaranteed to never |
||
| 29 | * process more than 64 elements provided that count argument is <= 64, |
||
| 30 | * so it is safe. This function is optimized for a common distribution |
||
| 31 | * of values for nCoeffs (they are mostly multiple of 8 plus one or |
||
| 32 | * two extra elements). So this function processes data as 8 elements |
||
| 33 | * per loop iteration and contains optional 2 elements processing in |
||
| 34 | * the end. |
||
| 35 | * |
||
| 36 | * Inner loop should take 6 cycles per element on arm926ej-s (Nokia 770) |
||
| 37 | */ |
||
| 38 | |||
| 39 | .macro dequant_t dst, src, mul, add, tmp |
||
| 40 | rsbs \tmp, ip, \src, asr #16 |
||
| 41 | it gt |
||
| 42 | addgt \tmp, \add, #0 |
||
| 43 | it lt |
||
| 44 | rsblt \tmp, \add, #0 |
||
| 45 | it ne |
||
| 46 | smlatbne \dst, \src, \mul, \tmp |
||
| 47 | .endm |
||
| 48 | |||
| 49 | .macro dequant_b dst, src, mul, add, tmp |
||
| 50 | rsbs \tmp, ip, \src, lsl #16 |
||
| 51 | it gt |
||
| 52 | addgt \tmp, \add, #0 |
||
| 53 | it lt |
||
| 54 | rsblt \tmp, \add, #0 |
||
| 55 | it ne |
||
| 56 | smlabbne \dst, \src, \mul, \tmp |
||
| 57 | .endm |
||
| 58 | |||
| 59 | function ff_dct_unquantize_h263_armv5te, export=1 |
||
| 60 | push {r4-r9,lr} |
||
| 61 | mov ip, #0 |
||
| 62 | subs r3, r3, #2 |
||
| 63 | ble 2f |
||
| 64 | ldrd r4, r5, [r0, #0] |
||
| 65 | 1: |
||
| 66 | ldrd r6, r7, [r0, #8] |
||
| 67 | |||
| 68 | dequant_t r9, r4, r1, r2, r9 |
||
| 69 | dequant_t lr, r5, r1, r2, lr |
||
| 70 | dequant_b r4, r4, r1, r2, r8 |
||
| 71 | dequant_b r5, r5, r1, r2, r8 |
||
| 72 | |||
| 73 | strh r4, [r0], #2 |
||
| 74 | strh r9, [r0], #2 |
||
| 75 | strh r5, [r0], #2 |
||
| 76 | strh lr, [r0], #2 |
||
| 77 | |||
| 78 | dequant_t r9, r6, r1, r2, r9 |
||
| 79 | dequant_t lr, r7, r1, r2, lr |
||
| 80 | dequant_b r6, r6, r1, r2, r8 |
||
| 81 | dequant_b r7, r7, r1, r2, r8 |
||
| 82 | |||
| 83 | strh r6, [r0], #2 |
||
| 84 | strh r9, [r0], #2 |
||
| 85 | strh r7, [r0], #2 |
||
| 86 | strh lr, [r0], #2 |
||
| 87 | |||
| 88 | subs r3, r3, #8 |
||
| 89 | it gt |
||
| 90 | ldrdgt r4, r5, [r0, #0] /* load data early to avoid load/use pipeline stall */ |
||
| 91 | bgt 1b |
||
| 92 | |||
| 93 | adds r3, r3, #2 |
||
| 94 | it le |
||
| 95 | pople {r4-r9,pc} |
||
| 96 | 2: |
||
| 97 | ldrsh r9, [r0, #0] |
||
| 98 | ldrsh lr, [r0, #2] |
||
| 99 | mov r8, r2 |
||
| 100 | cmp r9, #0 |
||
| 101 | it lt |
||
| 102 | rsblt r8, r2, #0 |
||
| 103 | it ne |
||
| 104 | smlabbne r9, r9, r1, r8 |
||
| 105 | mov r8, r2 |
||
| 106 | cmp lr, #0 |
||
| 107 | it lt |
||
| 108 | rsblt r8, r2, #0 |
||
| 109 | it ne |
||
| 110 | smlabbne lr, lr, r1, r8 |
||
| 111 | strh r9, [r0], #2 |
||
| 112 | strh lr, [r0], #2 |
||
| 113 | pop {r4-r9,pc} |
||
| 114 | endfunc |