83 lines
2.6 KiB
ArmAsm
83 lines
2.6 KiB
ArmAsm
/*****************************************************************************
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* bitstream-a.S: aarch64 bitstream functions
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*****************************************************************************
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* Copyright (C) 2014-2025 x264 project
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*
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* Authors: Janne Grunau <janne-x264@jannau.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*
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* This program is also available under a commercial proprietary license.
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* For more information, contact us at licensing@x264.com.
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*****************************************************************************/
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#include "asm.S"
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function nal_escape_neon, export=1
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movi v0.16b, #0xff
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movi v4.16b, #4
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mov w3, #3
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subs x6, x1, x2
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cbz x6, 99f
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0:
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cmn x6, #15
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b.lt 16f
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mov x1, x2
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b 100f
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16:
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ld1 {v1.16b}, [x1], #16
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ext v2.16b, v0.16b, v1.16b, #14
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ext v3.16b, v0.16b, v1.16b, #15
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cmhi v7.16b, v4.16b, v1.16b
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cmeq v5.16b, v2.16b, #0
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cmeq v6.16b, v3.16b, #0
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and v5.16b, v5.16b, v7.16b
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and v5.16b, v5.16b, v6.16b
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shrn v7.8b, v5.8h, #4
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mov x7, v7.d[0]
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cbz x7, 16f
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mov x6, #-16
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100:
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umov w5, v0.b[14]
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umov w4, v0.b[15]
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orr w5, w4, w5, lsl #8
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101:
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ldrb w4, [x1, x6]
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orr w9, w4, w5, lsl #16
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cmp w9, #3
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b.hi 102f
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strb w3, [x0], #1
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orr w5, w3, w5, lsl #8
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102:
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adds x6, x6, #1
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strb w4, [x0], #1
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orr w5, w4, w5, lsl #8
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b.lt 101b
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subs x6, x1, x2
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lsr w9, w5, #8
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mov v0.b[14], w9
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mov v0.b[15], w5
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b.lt 0b
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ret
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16:
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subs x6, x1, x2
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st1 {v1.16b}, [x0], #16
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mov v0.16b, v1.16b
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b.lt 0b
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99:
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ret
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endfunc
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