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75 lines
2.1 KiB
75 lines
2.1 KiB
/* |
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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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#elif defined(RUNTIME_CPUDETECT) |
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int proc_ver; |
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// support of mfspr PVR emulation added in Linux 2.6.17 |
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asm volatile("mfspr %0, 287" : "=r" (proc_ver)); |
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proc_ver >>= 16; |
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if (proc_ver & 0x8000 || |
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proc_ver == 0x000c || |
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proc_ver == 0x0039 || proc_ver == 0x003c || |
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proc_ver == 0x0044 || proc_ver == 0x0045 || |
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proc_ver == 0x0070) |
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return 1; |
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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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