mirror of
https://github.com/FFmpeg/FFmpeg.git
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121 lines
4.3 KiB
ArmAsm
121 lines
4.3 KiB
ArmAsm
@
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@ ARMv4-optimized IDCT functions
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@ Copyright (c) 2004 AGAWA Koji <i (AT) atty (DOT) jp>
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@
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@ This file is part of FFmpeg.
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@
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@ FFmpeg is free software; you can redistribute it and/or
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@ modify it under the terms of the GNU Lesser General Public
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@ License as published by the Free Software Foundation; either
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@ version 2.1 of the License, or (at your option) any later version.
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@
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@ FFmpeg is distributed in the hope that it will be useful,
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@ but WITHOUT ANY WARRANTY; without even the implied warranty of
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@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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@ Lesser General Public License for more details.
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@
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@ You should have received a copy of the GNU Lesser General Public
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@ License along with FFmpeg; if not, write to the Free Software
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@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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@
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#include "config.h"
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#include "libavutil/arm/asm.S"
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@ void ff_add_pixels_clamped_arm(int16_t *block, uint8_t *dest, ptrdiff_t stride)
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function ff_add_pixels_clamped_arm, export=1, align=5
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push {r4-r10}
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mov r10, #8
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1:
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ldr r4, [r1] /* load dest */
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/* block[0] and block[1]*/
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ldrsh r5, [r0]
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ldrsh r7, [r0, #2]
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and r6, r4, #0xFF
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and r8, r4, #0xFF00
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add r6, r6, r5
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add r8, r7, r8, lsr #8
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mvn r5, r5
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mvn r7, r7
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tst r6, #0x100
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it ne
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movne r6, r5, lsr #24
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tst r8, #0x100
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it ne
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movne r8, r7, lsr #24
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mov r9, r6
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ldrsh r5, [r0, #4] /* moved form [A] */
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orr r9, r9, r8, lsl #8
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/* block[2] and block[3] */
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/* [A] */
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ldrsh r7, [r0, #6]
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and r6, r4, #0xFF0000
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and r8, r4, #0xFF000000
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add r6, r5, r6, lsr #16
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add r8, r7, r8, lsr #24
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mvn r5, r5
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mvn r7, r7
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tst r6, #0x100
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it ne
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movne r6, r5, lsr #24
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tst r8, #0x100
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it ne
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movne r8, r7, lsr #24
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orr r9, r9, r6, lsl #16
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ldr r4, [r1, #4] /* moved form [B] */
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orr r9, r9, r8, lsl #24
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/* store dest */
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ldrsh r5, [r0, #8] /* moved form [C] */
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str r9, [r1]
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/* load dest */
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/* [B] */
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/* block[4] and block[5] */
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/* [C] */
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ldrsh r7, [r0, #10]
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and r6, r4, #0xFF
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and r8, r4, #0xFF00
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add r6, r6, r5
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add r8, r7, r8, lsr #8
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mvn r5, r5
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mvn r7, r7
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tst r6, #0x100
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it ne
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movne r6, r5, lsr #24
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tst r8, #0x100
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it ne
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movne r8, r7, lsr #24
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mov r9, r6
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ldrsh r5, [r0, #12] /* moved from [D] */
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orr r9, r9, r8, lsl #8
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/* block[6] and block[7] */
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/* [D] */
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ldrsh r7, [r0, #14]
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and r6, r4, #0xFF0000
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and r8, r4, #0xFF000000
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add r6, r5, r6, lsr #16
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add r8, r7, r8, lsr #24
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mvn r5, r5
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mvn r7, r7
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tst r6, #0x100
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it ne
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movne r6, r5, lsr #24
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tst r8, #0x100
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it ne
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movne r8, r7, lsr #24
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orr r9, r9, r6, lsl #16
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add r0, r0, #16 /* moved from [E] */
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orr r9, r9, r8, lsl #24
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subs r10, r10, #1 /* moved from [F] */
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/* store dest */
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str r9, [r1, #4]
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/* [E] */
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/* [F] */
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add r1, r1, r2
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bne 1b
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pop {r4-r10}
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bx lr
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endfunc
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