gcc/testsuite/gcc.dg/pr43564.c

   1 /* { dg-options "-O0" } */
   2 /* { dg-do compile } */
   3
   4 static inline __attribute__ ((__always_inline__))
   5 unsigned __clz (unsigned input)
   6 {
   7   unsigned output;
   8   __asm__ __volatile__ ("clz %0, %1":"=r" (output):"r" (input));
   9 }
  10 __attribute__ ((optimize ("O2")))
  11 void foo ()
  12 {
  13   unsigned a;
  14   unsigned b;
  15   a = __clz (b);
  16 }