gcc/testsuite/gcc.target/i386/bmi-tzcnt-2.c

   1 /* { dg-do run { target bmi } } */
   2 /* { dg-options "-O2 -mbmi -fno-inline" } */
   3
   4 #include <x86intrin.h>
   5
   6 #include "bmi-check.h"
   7
   8 int calc_tzcnt_u32 (int src)
   9 {
  10   int i;
  11   int res = 0;
  12
  13   while ( (res<32) && ((src&1) == 0)) {
  14     ++res;
  15     src >>= 1;
  16   }
  17   return res;
  18 }
  19
  20 static void
  21 bmi_test ()
  22 {
  23   unsigned i;
  24   int src = 0xfacec0ff;
  25   int res, res_ref;
  26
  27   for (i=0; i<5; ++i) {
  28     src = i + src << i;
  29
  30     res_ref = calc_tzcnt_u32 (src);
  31     res = __tzcnt_u32 (src);
  32
  33     if (res != res_ref)
  34       abort();
  35   }
  36 }