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/*****************************************************************************

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 * bitstream-a.S: arm bitstream functions

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 *****************************************************************************

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 * Copyright (C) 2014-2016 x264 project

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 *

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 * Authors: Janne Grunau <[email protected]>

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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 [email protected].

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 *****************************************************************************/

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#include "asm.S"

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function x264_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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