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Simplify AltiVec detection on Linux

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This commit is contained in:
Jan Beich 2019-04-01 12:42:19 +00:00
parent 329c72a485
commit 82486255da
1 changed files with 2 additions and 29 deletions
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31
src/strategyselector.c
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@ -375,39 +375,12 @@ static INLINE int get_cpuid(unsigned level, unsigned sublevel, cpuid_t *cpu_info
#if COMPILE_POWERPC
# if defined(__linux__)
#include <fcntl.h>
#include <unistd.h>
#include <linux/auxvec.h>
#include <asm/cputable.h>
#include <sys/auxv.h>
//Source: http://freevec.org/function/altivec_runtime_detection_linux
static int altivec_available(void)
{
int result = 0;
unsigned long buf[64];
ssize_t count;
int fd, i;
fd = open("/proc/self/auxv", O_RDONLY);
if (fd < 0) {
return 0;
}
// loop on reading
do {
count = read(fd, buf, sizeof(buf));
if (count < 0)
break;
for (i=0; i < (count / sizeof(unsigned long)); i += 2) {
if (buf[i] == AT_HWCAP) {
result = !!(buf[i+1] & PPC_FEATURE_HAS_ALTIVEC);
goto out_close;
} else if (buf[i] == AT_NULL)
goto out_close;
}
} while (count == sizeof(buf));
out_close:
close(fd);
return result;
return !!(getauxval(AT_HWCAP) & PPC_FEATURE_HAS_ALTIVEC);
}
# elif defined(__FreeBSD__)
#include <sys/types.h>