Re: [PATCH][X86] Fix rounding pattern similar to PR73350

[Uros Bizjak <ubizjak@gmail.com>]

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On Tue, Jun 13, 2017 at 1:37 PM, Koval, Julia <julia.koval@intel.com> wrote:
> Thank you for your help. I fixed the test similar to existing sigaction tests.
>
> gcc/
>         * config/i386/i386.c: Fix rounding expand for new pattern.
>         * config/i386/subst.md: Fix pattern (parallel -> unspec).
> gcc/testsuite/
>         * gcc.target/i386/pr73350-2.c: New test.

The test will fail at runtime on non-avx512er targets. Can you please
test the attached testcase?

Uros.

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/* { dg-do run { target *-*-linux* *-*-gnu* } } */
/* { dg-options "-O2 -mavx512er" } */
/* { dg-require-effective-target avx512er } */

#include "avx512er-check.h"

#include <x86intrin.h>
#include <unistd.h>
#include <signal.h>

static int counter;

void handler (int i)
{
  counter++;
}

static void
avx512er_test (void)
{
  struct sigaction s;
  sigemptyset (&s.sa_mask);
  s.sa_handler = handler;
  s.sa_flags = 0;
  sigaction (SIGFPE, &s, NULL);

  __m512 a = _mm512_set1_ps (-1.f);

  _mm_setcsr ( _MM_MASK_MASK & ~_MM_MASK_INVALID );
  volatile __m512 r1 = _mm512_rsqrt28_round_ps (a, _MM_FROUND_NO_EXC);
  volatile __m512 r2 = _mm512_rsqrt28_round_ps (a, _MM_FROUND_CUR_DIRECTION);
  
  if (counter != 1)
    abort ();
}