| ;****************************************************************************** | |
| ;* Vorbis x86 optimizations | |
| ;* Copyright (C) 2006 Loren Merritt <[email protected]> | |
| ;* | |
| ;* 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 "libavutil/x86/x86util.asm" | |
| SECTION_RODATA | |
| pdw_80000000: times 4 dd 0x80000000 | |
| SECTION | |
| INIT_XMM sse | |
| cglobal vorbis_inverse_coupling, 3, 3, 6, mag, ang, block_size | |
| mova m5, [pdw_80000000] | |
| shl block_sized, 2 | |
| add magq, block_sizeq | |
| add angq, block_sizeq | |
| neg block_sizeq | |
| align 16 | |
| .loop: | |
| mova m0, [magq+block_sizeq] | |
| mova m1, [angq+block_sizeq] | |
| xorps m2, m2 | |
| xorps m3, m3 | |
| cmpleps m2, m0 ; m <= 0.0 | |
| cmpleps m3, m1 ; a <= 0.0 | |
| andps m2, m5 ; keep only the sign bit | |
| xorps m1, m2 | |
| mova m4, m3 | |
| andps m3, m1 | |
| andnps m4, m1 | |
| addps m3, m0 ; a = m + ((a < 0) & (a ^ sign(m))) | |
| subps m0, m4 ; m = m + ((a > 0) & (a ^ sign(m))) | |
| mova [angq+block_sizeq], m3 | |
| mova [magq+block_sizeq], m0 | |
| add block_sizeq, mmsize | |
| jl .loop | |
| RET | |