mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-22 07:20:45 +00:00
be449fca79
Neither the asm() nor the __asm__() keyword is part of the C99 standard, but while GCC accepts the former in C89 syntax, it is not accepted in C99 unless GNU extensions are turned on (with -fasm). The latter form is accepted in any syntax as an extension (without requiring further command-line options). Sun Studio C99 compiler also does not accept asm() while accepting __asm__(), albeit reporting warnings that it's not valid C99 syntax. Originally committed as revision 15627 to svn://svn.ffmpeg.org/ffmpeg/trunk
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
|
|
/**
|
|
* @file check_altivec.c
|
|
* Checks for AltiVec presence.
|
|
*/
|
|
|
|
#ifdef __APPLE__
|
|
#undef _POSIX_C_SOURCE
|
|
#include <sys/sysctl.h>
|
|
#elif __OpenBSD__
|
|
#include <sys/param.h>
|
|
#include <sys/sysctl.h>
|
|
#include <machine/cpu.h>
|
|
#elif __AMIGAOS4__
|
|
#include <exec/exec.h>
|
|
#include <interfaces/exec.h>
|
|
#include <proto/exec.h>
|
|
#endif /* __APPLE__ */
|
|
|
|
/**
|
|
* This function MAY rely on signal() or fork() in order to make sure AltiVec
|
|
* is present.
|
|
*/
|
|
|
|
int has_altivec(void)
|
|
{
|
|
#ifdef __AMIGAOS4__
|
|
ULONG result = 0;
|
|
extern struct ExecIFace *IExec;
|
|
|
|
IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
|
|
if (result == VECTORTYPE_ALTIVEC) return 1;
|
|
return 0;
|
|
#elif defined(__APPLE__) || defined(__OpenBSD__)
|
|
#ifdef __OpenBSD__
|
|
int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
|
|
#else
|
|
int sels[2] = {CTL_HW, HW_VECTORUNIT};
|
|
#endif
|
|
int has_vu = 0;
|
|
size_t len = sizeof(has_vu);
|
|
int err;
|
|
|
|
err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
|
|
|
|
if (err == 0) return has_vu != 0;
|
|
return 0;
|
|
#elif defined(RUNTIME_CPUDETECT)
|
|
int proc_ver;
|
|
// Support of mfspr PVR emulation added in Linux 2.6.17.
|
|
__asm__ volatile("mfspr %0, 287" : "=r" (proc_ver));
|
|
proc_ver >>= 16;
|
|
if (proc_ver & 0x8000 ||
|
|
proc_ver == 0x000c ||
|
|
proc_ver == 0x0039 || proc_ver == 0x003c ||
|
|
proc_ver == 0x0044 || proc_ver == 0x0045 ||
|
|
proc_ver == 0x0070)
|
|
return 1;
|
|
return 0;
|
|
#else
|
|
// Since we were compiled for AltiVec, just assume we have it
|
|
// until someone comes up with a proper way (not involving signal hacks).
|
|
return 1;
|
|
#endif /* __AMIGAOS4__ */
|
|
}
|
|
|