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[0.4.x] libvisual: Improve AltiVec detection for PPC/PPC64 Linux #268

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Merged
hartwork merged 1 commit into from
Feb 10, 2023
Merged

[0.4.x] libvisual: Improve AltiVec detection for PPC/PPC64 Linux #268

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51 changes: 51 additions & 0 deletions libvisual/libvisual/lv_cpu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -50,8 +50,19 @@
#endif

#if defined(VISUAL_OS_LINUX)
#if defined(VISUAL_ARCH_POWERPC)
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>

#include <linux/auxvec.h>
#include <asm/cputable.h>
#else /* VISUAL_ARCH_POWERPC */
#include <signal.h>
#endif
#endif

#if defined(VISUAL_OS_WIN32)
#include <windows.h>
Expand Down Expand Up @@ -154,6 +165,46 @@ static void check_os_altivec_support( void )
if (err == 0)
if (has_vu != 0)
__lv_cpu_caps.hasAltiVec = 1;
#elif defined (VISUAL_OS_LINUX)
static int available = -1;
int new_avail = 0;
char fname[64];
unsigned long buf[64];
ssize_t count;
pid_t pid;
int fd, i;

if (available != -1)
return;

pid = getpid();
snprintf(fname, sizeof(fname)-1, "/proc/%d/auxv", pid);

fd = open(fname, O_RDONLY);
if (fd < 0)
goto out;
more:
count = read(fd, buf, sizeof(buf));
if (count < 0)
goto out_close;

for (i=0; i < (count / sizeof(unsigned long)); i += 2) {
if (buf[i] == AT_HWCAP) {
new_avail = !!(buf[i+1] & PPC_FEATURE_HAS_ALTIVEC);
goto out_close;
} else if (buf[i] == AT_NULL) {
goto out_close;
}
}

if (count == sizeof(buf))
goto more;
out_close:
close(fd);
out:
available = new_avail;
if (available)
__lv_cpu_caps.hasAltiVec = 1;
#else /* !VISUAL_OS_DARWIN */
/* no Darwin, do it the brute-force way */
/* this is borrowed from the libmpeg2 library */
Expand Down