parse_proc_cpuinfo (int bufsize)
{
char *buffer = (char *)malloc(bufsize);
FILE *fd;
if (!buffer)
return 0;
fd = fopen("/proc/cpuinfo", "r");
if (fd) {
while (fgets(buffer, bufsize, fd)) {
if (!strchr(buffer, '\n') && !feof(fd)) {
/* "impossible" happened - insufficient size of the buffer! */
fclose(fd);
free(buffer);
return 0;
}
if (check_cpuinfo(buffer, "CPU part", "0xd03") ||
check_cpuinfo(buffer, "CPU part", "0xd07"))
/* The Cortex-A53 has a slow tbl implementation. We can gain a few
percent speedup by disabling the use of that instruction. The
speedup on Cortex-A57 is more subtle but still measurable. */
simd_features &= ~JSIMD_FASTTBL;
else if (check_cpuinfo(buffer, "CPU part", "0x0a1"))
/* The SIMD version of Huffman encoding is slower than the C version on
Cavium ThunderX. Also, ld3 and st3 are abyssmally slow on that
CPU. */
simd_huffman = simd_features = 0;
}
fclose(fd);
}
free(buffer);
return 1;
}
int
main(int argc, char *argv[])
{
START(argc, argv, "util_cpuid");
check_cpuinfo();
DONE(NULL);
}