gcc/testsuite/gcc.target/i386/bmi-tzcnt-1.c

   1 /* { dg-do run { target { bmi && { ! ia32 } } } } */
   2 /* { dg-options "-O2 -mbmi -fno-inline" } */
   3
   4 #include <x86intrin.h>
   5
   6 #include "bmi-check.h"
   7
   8 long long calc_tzcnt_u64 (long long src)
   9 {
  10   int i;
  11   int res = 0;
  12
  13   while ( (res<64) && ((src&1) == 0)) {
  14     ++res;
  15     src >>= 1;
  16   }
  17
  18   return res;
  19 }
  20
  21 static void
  22 bmi_test ()
  23 {
  24   unsigned i;
  25   long long src = 0xfacec0ffeefacec0;
  26   long long res, res_ref;
  27
  28   for (i=0; i<5; ++i) {
  29     src = i + src << i;
  30
  31     res_ref = calc_tzcnt_u64 (src);
  32     res = __tzcnt_u64 (src);
  33
  34     if (res != res_ref)
  35       abort();
  36   }
  37 }