gcc/testsuite/gcc.dg/builtin-ffs-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2" } */
   3
   4 extern int ffs (int) __asm ("__GI_ffs") __attribute__ ((nothrow, const));
   5
   6 int
   7 ffsll (long long int i)
   8 {
   9   unsigned long long int x = i & -i;
  10
  11   if (x <= 0xffffffff)
  12     return ffs (i);
  13   else
  14     return 32 + ffs (i >> 32);
  15 }
  16
  17 /* { dg-final { scan-assembler-not "\nffs\n|\nffs\[^a-zA-Z0-9_\]|\[^a-zA-Z0-9_\]ffs\n" } } */