File: bmi2-bzhi32-1.c

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gcc-arm-none-eabi 15%3A8-2019-q3-1
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/* { dg-do run } */
/* { dg-options "-O3" } */
/* { dg-require-effective-target lp64 } */
/* { dg-require-effective-target ppc_cpu_supports_hw } */

#define NO_WARN_X86_INTRINSICS 1
#include <x86intrin.h>
#include "bmi2-check.h"

__attribute__((noinline))
unsigned
calc_bzhi_u32 (unsigned a, int l)
{
  unsigned res = a;
  int i;
  for (i = 0; i < 32 - l; ++i)
    res &= ~(1 << (31 - i));

  return res;
}

static void
bmi2_test ()
{
  unsigned i;
  unsigned src = 0xce7ace0f;
  unsigned res, res_ref;

  for (i = 0; i < 5; ++i) {
    src = src * (i + 1);

    res_ref = calc_bzhi_u32 (src, i * 2);
    res = _bzhi_u32 (src, i * 2);

    if (res != res_ref)
      abort();
  }
}