79 lines
2.8 KiB
ArmAsm
79 lines
2.8 KiB
ArmAsm
/*
|
|
* Copyright (c) 2008 Siarhei Siamashka <ssvb@users.sourceforge.net>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "libavutil/arm/asm.S"
|
|
|
|
/**
|
|
* ARM VFP optimized float to int16 conversion.
|
|
* Assume that len is a positive number and is multiple of 8, destination
|
|
* buffer is at least 4 bytes aligned (8 bytes alignment is better for
|
|
* performance), little-endian byte sex.
|
|
*/
|
|
@ void ff_float_to_int16_vfp(int16_t *dst, const float *src, int len)
|
|
function ff_float_to_int16_vfp, export=1
|
|
push {r4-r8,lr}
|
|
vpush {d8-d11}
|
|
vldmia r1!, {s16-s23}
|
|
vcvt.s32.f32 s0, s16
|
|
vcvt.s32.f32 s1, s17
|
|
vcvt.s32.f32 s2, s18
|
|
vcvt.s32.f32 s3, s19
|
|
vcvt.s32.f32 s4, s20
|
|
vcvt.s32.f32 s5, s21
|
|
vcvt.s32.f32 s6, s22
|
|
vcvt.s32.f32 s7, s23
|
|
1:
|
|
subs r2, r2, #8
|
|
vmov r3, r4, s0, s1
|
|
vmov r5, r6, s2, s3
|
|
vmov r7, r8, s4, s5
|
|
vmov ip, lr, s6, s7
|
|
it gt
|
|
vldmiagt r1!, {s16-s23}
|
|
ssat r4, #16, r4
|
|
ssat r3, #16, r3
|
|
ssat r6, #16, r6
|
|
ssat r5, #16, r5
|
|
pkhbt r3, r3, r4, lsl #16
|
|
pkhbt r4, r5, r6, lsl #16
|
|
itttt gt
|
|
vcvtgt.s32.f32 s0, s16
|
|
vcvtgt.s32.f32 s1, s17
|
|
vcvtgt.s32.f32 s2, s18
|
|
vcvtgt.s32.f32 s3, s19
|
|
itttt gt
|
|
vcvtgt.s32.f32 s4, s20
|
|
vcvtgt.s32.f32 s5, s21
|
|
vcvtgt.s32.f32 s6, s22
|
|
vcvtgt.s32.f32 s7, s23
|
|
ssat r8, #16, r8
|
|
ssat r7, #16, r7
|
|
ssat lr, #16, lr
|
|
ssat ip, #16, ip
|
|
pkhbt r5, r7, r8, lsl #16
|
|
pkhbt r6, ip, lr, lsl #16
|
|
stmia r0!, {r3-r6}
|
|
bgt 1b
|
|
|
|
vpop {d8-d11}
|
|
pop {r4-r8,pc}
|
|
endfunc
|