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d9a5dab2da
in a library. Should not change anything for PPC, the autodetection is currently pointless due to other code being compiled with -maltivec as well (and detection for OSX and AmigaOS remains in place). SPARC binaries built with VIS support can now only run on systems with VIS. Originally committed as revision 10648 to svn://svn.ffmpeg.org/ffmpeg/trunk
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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/**
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* @file check_altivec.c
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* Checks for AltiVec presence.
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*/
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#ifdef __APPLE__
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#include <sys/sysctl.h>
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#elif __AMIGAOS4__
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#include <exec/exec.h>
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#include <interfaces/exec.h>
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#include <proto/exec.h>
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#endif /* __APPLE__ */
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/**
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* This function MAY rely on signal() or fork() in order to make sure altivec
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* is present
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*/
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int has_altivec(void)
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{
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#ifdef __AMIGAOS4__
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ULONG result = 0;
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extern struct ExecIFace *IExec;
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IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
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if (result == VECTORTYPE_ALTIVEC) return 1;
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return 0;
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#elif __APPLE__
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int sels[2] = {CTL_HW, HW_VECTORUNIT};
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int has_vu = 0;
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size_t len = sizeof(has_vu);
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int err;
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err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
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if (err == 0) return (has_vu != 0);
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return 0;
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#else
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// since we were compiled for altivec, just assume we have it
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// until someone comes up with a proper way (not involving signal hacks).
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return 1;
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#endif /* __AMIGAOS4__ */
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}
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