/* { dg-do run { target { lzcnt } } } */ | |
/* { dg-options "-O2 -mlzcnt -fno-inline" } */ | |
#include <x86intrin.h> | |
#include "lzcnt-check.h" | |
int calc_lzcnt_u32 (int src) | |
{ | |
int i; | |
int res = 0; | |
while ((res < 32) && (((src >> (31 - res)) & 1) == 0)) | |
++res; | |
return res; | |
} | |
static void | |
lzcnt_test () | |
{ | |
unsigned i; | |
int src = 0xce7ace0; | |
int res, res_ref; | |
for (i=0; i<5; ++i) { | |
src = src >> i; | |
res_ref = calc_lzcnt_u32 (src); | |
res = __lzcnt32 (src); | |
if (res != res_ref) | |
abort(); | |
} | |
} |