1/*
2 * Copyright (c) 2008 Siarhei Siamashka <ssvb@users.sourceforge.net>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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)
31function 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
431:
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}
78endfunc
79