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x264 source for verification 2026-05-22

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admin
2026-05-22 16:45:04 +08:00
commit 4647f166e5
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common/aarch64/bitstream-a.S Normal file
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/*****************************************************************************
* bitstream-a.S: aarch64 bitstream functions
*****************************************************************************
* Copyright (C) 2014-2025 x264 project
*
* Authors: Janne Grunau <janne-x264@jannau.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
*
* This program is also available under a commercial proprietary license.
* For more information, contact us at licensing@x264.com.
*****************************************************************************/
#include "asm.S"
function nal_escape_neon, export=1
movi v0.16b, #0xff
movi v4.16b, #4
mov w3, #3
subs x6, x1, x2
cbz x6, 99f
0:
cmn x6, #15
b.lt 16f
mov x1, x2
b 100f
16:
ld1 {v1.16b}, [x1], #16
ext v2.16b, v0.16b, v1.16b, #14
ext v3.16b, v0.16b, v1.16b, #15
cmhi v7.16b, v4.16b, v1.16b
cmeq v5.16b, v2.16b, #0
cmeq v6.16b, v3.16b, #0
and v5.16b, v5.16b, v7.16b
and v5.16b, v5.16b, v6.16b
shrn v7.8b, v5.8h, #4
mov x7, v7.d[0]
cbz x7, 16f
mov x6, #-16
100:
umov w5, v0.b[14]
umov w4, v0.b[15]
orr w5, w4, w5, lsl #8
101:
ldrb w4, [x1, x6]
orr w9, w4, w5, lsl #16
cmp w9, #3
b.hi 102f
strb w3, [x0], #1
orr w5, w3, w5, lsl #8
102:
adds x6, x6, #1
strb w4, [x0], #1
orr w5, w4, w5, lsl #8
b.lt 101b
subs x6, x1, x2
lsr w9, w5, #8
mov v0.b[14], w9
mov v0.b[15], w5
b.lt 0b
ret
16:
subs x6, x1, x2
st1 {v1.16b}, [x0], #16
mov v0.16b, v1.16b
b.lt 0b
99:
ret
endfunc