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79 lines
2.8 KiB
79 lines
2.8 KiB
11 years ago
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/*
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* Copyright (c) 2008 Siarhei Siamashka <ssvb@users.sourceforge.net>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include "libavutil/arm/asm.S"
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/**
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* ARM VFP optimized float to int16 conversion.
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* Assume that len is a positive number and is multiple of 8, destination
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* buffer is at least 4 bytes aligned (8 bytes alignment is better for
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* performance), little-endian byte sex.
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*/
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@ void ff_float_to_int16_vfp(int16_t *dst, const float *src, int len)
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function ff_float_to_int16_vfp, export=1
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push {r4-r8,lr}
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vpush {d8-d11}
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vldmia r1!, {s16-s23}
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vcvt.s32.f32 s0, s16
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vcvt.s32.f32 s1, s17
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vcvt.s32.f32 s2, s18
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vcvt.s32.f32 s3, s19
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vcvt.s32.f32 s4, s20
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vcvt.s32.f32 s5, s21
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vcvt.s32.f32 s6, s22
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vcvt.s32.f32 s7, s23
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1:
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subs r2, r2, #8
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vmov r3, r4, s0, s1
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vmov r5, r6, s2, s3
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vmov r7, r8, s4, s5
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vmov ip, lr, s6, s7
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it gt
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vldmiagt r1!, {s16-s23}
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ssat r4, #16, r4
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ssat r3, #16, r3
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ssat r6, #16, r6
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ssat r5, #16, r5
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pkhbt r3, r3, r4, lsl #16
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pkhbt r4, r5, r6, lsl #16
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itttt gt
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vcvtgt.s32.f32 s0, s16
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vcvtgt.s32.f32 s1, s17
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vcvtgt.s32.f32 s2, s18
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vcvtgt.s32.f32 s3, s19
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itttt gt
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vcvtgt.s32.f32 s4, s20
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vcvtgt.s32.f32 s5, s21
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vcvtgt.s32.f32 s6, s22
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vcvtgt.s32.f32 s7, s23
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ssat r8, #16, r8
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ssat r7, #16, r7
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ssat lr, #16, lr
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ssat ip, #16, ip
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pkhbt r5, r7, r8, lsl #16
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pkhbt r6, ip, lr, lsl #16
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stmia r0!, {r3-r6}
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bgt 1b
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vpop {d8-d11}
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pop {r4-r8,pc}
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endfunc
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