85 lines
2.5 KiB
ArmAsm
85 lines
2.5 KiB
ArmAsm
/*****************************************************************************
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* bitstream-a.S: arm 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
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push {r4-r5,lr}
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vmov.u8 q0, #0xff
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vmov.u8 q8, #4
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mov r3, #3
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subs lr, r1, r2
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beq 99f
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0:
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cmn lr, #15
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blt 16f
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mov r1, r2
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b 100f
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16:
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vld1.8 {q1}, [r1]!
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vext.8 q2, q0, q1, #14
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vext.8 q3, q0, q1, #15
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vcgt.u8 q11, q8, q1
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vceq.u8 q9, q2, #0
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vceq.u8 q10, q3, #0
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vand q9, q9, q11
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vand q9, q9, q10
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vshrn.u16 d22, q9, #4
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vmov ip, lr, d22
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orrs ip, ip, lr
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beq 16f
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mov lr, #-16
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100:
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vmov.u8 r5, d1[6]
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vmov.u8 r4, d1[7]
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orr r5, r4, r5, lsl #8
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101:
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ldrb r4, [r1, lr]
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orr ip, r4, r5, lsl #16
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cmp ip, #3
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bhi 102f
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strb r3, [r0], #1
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orr r5, r3, r5, lsl #8
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102:
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adds lr, lr, #1
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strb r4, [r0], #1
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orr r5, r4, r5, lsl #8
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blt 101b
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subs lr, r1, r2
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lsr ip, r5, #8
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vmov.u8 d1[6], ip
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vmov.u8 d1[7], r5
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blt 0b
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pop {r4-r5,pc}
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16:
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subs lr, r1, r2
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vst1.8 {q1}, [r0]!
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vmov q0, q1
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blt 0b
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99:
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pop {r4-r5,pc}
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endfunc
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