| /* |
| * 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" |
| |
| /** |
| * 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 |
