gcc/testsuite/gcc.target/i386/pr81015.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -mlzcnt" } */
   3 /* { dg-require-effective-target lzcnt } */
   4
   5 #include "lzcnt-check.h"
   6
   7 int
   8 __attribute__ ((noinline, noclone))
   9 foo (unsigned short a)
  10 {
  11   return __builtin_clz (a);
  12 }
  13
  14 static void
  15 lzcnt_test ()
  16 {
  17   int res = foo (1);
  18
  19   if (res != 31)
  20     abort ();
  21 }