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FFmpeg/libavcodec/arm/fmtconvert_vfp.S

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  1. /*

  2.  * Copyright (c) 2008 Siarhei Siamashka <ssvb@users.sourceforge.net>

  3.  *

  4.  * This file is part of Libav.

  5.  *

  6.  * Libav is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * Libav is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with Libav; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. #include "config.h"

  22. #include "libavutil/arm/asm.S"

  23. 

  24. /**

  25.  * ARM VFP optimized float to int16 conversion.

  26.  * Assume that len is a positive number and is multiple of 8, destination

  27.  * buffer is at least 4 bytes aligned (8 bytes alignment is better for

  28.  * performance), little endian byte sex

  29.  */

  30. @ void ff_float_to_int16_vfp(int16_t *dst, const float *src, int len)

  31. function ff_float_to_int16_vfp, export=1

  32.         push            {r4-r8,lr}

  33.         vpush           {d8-d11}

  34.         vldmia          r1!, {s16-s23}

  35.         vcvt.s32.f32    s0,  s16

  36.         vcvt.s32.f32    s1,  s17

  37.         vcvt.s32.f32    s2,  s18

  38.         vcvt.s32.f32    s3,  s19

  39.         vcvt.s32.f32    s4,  s20

  40.         vcvt.s32.f32    s5,  s21

  41.         vcvt.s32.f32    s6,  s22

  42.         vcvt.s32.f32    s7,  s23

  43. 1:

  44.         subs            r2,  r2,  #8

  45.         vmov            r3,  r4,  s0, s1

  46.         vmov            r5,  r6,  s2, s3

  47.         vmov            r7,  r8,  s4, s5

  48.         vmov            ip,  lr,  s6, s7

  49.         it              gt

  50.         vldmiagt        r1!, {s16-s23}

  51.         ssat            r4,  #16, r4

  52.         ssat            r3,  #16, r3

  53.         ssat            r6,  #16, r6

  54.         ssat            r5,  #16, r5

  55.         pkhbt           r3,  r3,  r4, lsl #16

  56.         pkhbt           r4,  r5,  r6, lsl #16

  57.         itttt           gt

  58.         vcvtgt.s32.f32  s0,  s16

  59.         vcvtgt.s32.f32  s1,  s17

  60.         vcvtgt.s32.f32  s2,  s18

  61.         vcvtgt.s32.f32  s3,  s19

  62.         itttt           gt

  63.         vcvtgt.s32.f32  s4,  s20

  64.         vcvtgt.s32.f32  s5,  s21

  65.         vcvtgt.s32.f32  s6,  s22

  66.         vcvtgt.s32.f32  s7,  s23

  67.         ssat            r8,  #16, r8

  68.         ssat            r7,  #16, r7

  69.         ssat            lr,  #16, lr

  70.         ssat            ip,  #16, ip

  71.         pkhbt           r5,  r7,  r8, lsl #16

  72.         pkhbt           r6,  ip,  lr, lsl #16

  73.         stmia           r0!, {r3-r6}

  74.         bgt             1b

  75. 

  76.         vpop            {d8-d11}

  77.         pop             {r4-r8,pc}

  78. endfunc