idctdsp_arm.S (4428B)
1 @ 2 @ ARMv4-optimized IDCT functions 3 @ Copyright (c) 2004 AGAWA Koji <i (AT) atty (DOT) jp> 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 @ void ff_add_pixels_clamped_arm(int16_t *block, uint8_t *dest, ptrdiff_t stride) 26 function ff_add_pixels_clamped_arm, export=1, align=5 27 push {r4-r10} 28 mov r10, #8 29 1: 30 ldr r4, [r1] /* load dest */ 31 /* block[0] and block[1]*/ 32 ldrsh r5, [r0] 33 ldrsh r7, [r0, #2] 34 and r6, r4, #0xFF 35 and r8, r4, #0xFF00 36 add r6, r6, r5 37 add r8, r7, r8, lsr #8 38 mvn r5, r5 39 mvn r7, r7 40 tst r6, #0x100 41 it ne 42 movne r6, r5, lsr #24 43 tst r8, #0x100 44 it ne 45 movne r8, r7, lsr #24 46 mov r9, r6 47 ldrsh r5, [r0, #4] /* moved form [A] */ 48 orr r9, r9, r8, lsl #8 49 /* block[2] and block[3] */ 50 /* [A] */ 51 ldrsh r7, [r0, #6] 52 and r6, r4, #0xFF0000 53 and r8, r4, #0xFF000000 54 add r6, r5, r6, lsr #16 55 add r8, r7, r8, lsr #24 56 mvn r5, r5 57 mvn r7, r7 58 tst r6, #0x100 59 it ne 60 movne r6, r5, lsr #24 61 tst r8, #0x100 62 it ne 63 movne r8, r7, lsr #24 64 orr r9, r9, r6, lsl #16 65 ldr r4, [r1, #4] /* moved form [B] */ 66 orr r9, r9, r8, lsl #24 67 /* store dest */ 68 ldrsh r5, [r0, #8] /* moved form [C] */ 69 str r9, [r1] 70 71 /* load dest */ 72 /* [B] */ 73 /* block[4] and block[5] */ 74 /* [C] */ 75 ldrsh r7, [r0, #10] 76 and r6, r4, #0xFF 77 and r8, r4, #0xFF00 78 add r6, r6, r5 79 add r8, r7, r8, lsr #8 80 mvn r5, r5 81 mvn r7, r7 82 tst r6, #0x100 83 it ne 84 movne r6, r5, lsr #24 85 tst r8, #0x100 86 it ne 87 movne r8, r7, lsr #24 88 mov r9, r6 89 ldrsh r5, [r0, #12] /* moved from [D] */ 90 orr r9, r9, r8, lsl #8 91 /* block[6] and block[7] */ 92 /* [D] */ 93 ldrsh r7, [r0, #14] 94 and r6, r4, #0xFF0000 95 and r8, r4, #0xFF000000 96 add r6, r5, r6, lsr #16 97 add r8, r7, r8, lsr #24 98 mvn r5, r5 99 mvn r7, r7 100 tst r6, #0x100 101 it ne 102 movne r6, r5, lsr #24 103 tst r8, #0x100 104 it ne 105 movne r8, r7, lsr #24 106 orr r9, r9, r6, lsl #16 107 add r0, r0, #16 /* moved from [E] */ 108 orr r9, r9, r8, lsl #24 109 subs r10, r10, #1 /* moved from [F] */ 110 /* store dest */ 111 str r9, [r1, #4] 112 113 /* [E] */ 114 /* [F] */ 115 add r1, r1, r2 116 bne 1b 117 118 pop {r4-r10} 119 bx lr 120 endfunc