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Merge pull request #224 from jbeich/powerpc

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Switch AltiVec on Linux to getauxval()
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Marko Viitanen 2019-04-08 08:24:12 +03:00 committed by GitHub
parent 329c72a485 85f46e17a9
commit 7a8641b002
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1 changed files with 13 additions and 30 deletions
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43
src/strategyselector.c
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@ -374,40 +374,23 @@ static INLINE int get_cpuid(unsigned level, unsigned sublevel, cpuid_t *cpu_info
#endif // COMPILE_INTEL
#if COMPILE_POWERPC
# if defined(__linux__)
#include <fcntl.h>
#include <unistd.h>
#include <linux/auxvec.h>
# if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD__ >= 12)
#ifdef __linux__
#include <asm/cputable.h>
#else
#include <machine/cpu.h>
#endif
#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;
unsigned long hwcap = 0;
#ifdef __linux__
hwcap = getauxval(AT_HWCAP);
#else
elf_aux_info(AT_HWCAP, &hwcap, sizeof(hwcap));
#endif
return !!(hwcap & PPC_FEATURE_HAS_ALTIVEC);
}
# elif defined(__FreeBSD__)
#include <sys/types.h>