gcc/testsuite/gcc.target/i386/bmi2-bzhi32-1.c

   1 /* { dg-do run { target { bmi2 } } } */
   2 /* { dg-options "-mbmi2 -O2" } */
   3
   4 #include <x86intrin.h>
   5 #include "bmi2-check.h"
   6
   7 __attribute__((noinline))
   8 unsigned
   9 calc_bzhi_u32 (unsigned a, int l)
  10 {
  11   unsigned res = a;
  12   int i;
  13   for (i = 0; i < 32 - l; ++i)
  14     res &= ~(1 << (31 - i));
  15
  16   return res;
  17 }
  18
  19 static void
  20 bmi2_test ()
  21 {
  22   unsigned i;
  23   unsigned src = 0xce7ace0f;
  24   unsigned res, res_ref;
  25
  26   for (i = 0; i < 5; ++i) {
  27     src = src * (i + 1);
  28
  29     res_ref = calc_bzhi_u32 (src, i * 2);
  30     res = _bzhi_u32 (src, i * 2);
  31
  32     if (res != res_ref)
  33       abort();
  34   }
  35 }