| /* { dg-do run } */ | |
| /* { dg-options "-O2 -mlzcnt" } */ | |
| /* { dg-require-effective-target lzcnt } */ | |
| #include "lzcnt-check.h" | |
| static int | |
| foo (unsigned int v) | |
| { | |
| return v ? __builtin_clz (v) : 32; | |
| } | |
| /* returns -1 if x == 0 */ | |
| int | |
| __attribute__ ((noinline, noclone)) | |
| bar (unsigned int x) | |
| { | |
| return 31 - foo (x); | |
| } | |
| static void | |
| lzcnt_test () | |
| { | |
| int r = bar (0); | |
| if (r != -1) | |
| abort (); | |
| } |