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Diffstat (limited to 'libavcodec/arm/fmtconvert_vfp.S')
| -rw-r--r-- | libavcodec/arm/fmtconvert_vfp.S | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/libavcodec/arm/fmtconvert_vfp.S b/libavcodec/arm/fmtconvert_vfp.S new file mode 100644 index 0000000000..1d19e7758b --- /dev/null +++ b/libavcodec/arm/fmtconvert_vfp.S @@ -0,0 +1,77 @@ +/* + * Copyright (c) 2008 Siarhei Siamashka <ssvb@users.sourceforge.net> + * + * This file is part of FFmpeg. + * + * FFmpeg 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. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "config.h" +#include "asm.S" + + .syntax unified + +/** + * 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 + 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 + vcvtgt.s32.f32 s0, s16 + vcvtgt.s32.f32 s1, s17 + vcvtgt.s32.f32 s2, s18 + vcvtgt.s32.f32 s3, s19 + 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 |