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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/108540] New: [13 Regression] Frange
 miscompilation of ruby since r13-3261
Date: Wed, 25 Jan 2023 15:48:48 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
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X-Bugzilla-Who: jakub at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108540

            Bug ID: 108540
           Summary: [13 Regression] Frange miscompilation of ruby since
                    r13-3261
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
  Target Milestone: ---

Since r13-3261-ga0c1a059101a3067d96211cbc4fae5905796d1db ruby is miscompiled
with LTO on powerpc64le-linux.
I've hand reduced it to:
#include <stdarg.h>

__attribute__((noipa)) void
bar (const char *cp, unsigned long size, char sign, int dsgn)
{
  if (__builtin_strcmp (cp, "ZERO") !=3D 0 || size !=3D 4 || sign !=3D '-' =
|| dsgn !=3D
1)
    __builtin_abort ();
}

__attribute__((noipa)) void
foo (int x, int ch, ...)
{
  va_list ap;
  const char *cp =3D "";
  unsigned long size =3D 0;
  char sign =3D '\0';
  double d;
  va_start (ap, ch);
  switch (x)
    {
    case 42:
      d =3D va_arg (ap, double);
      if (__builtin_isinf (d))
        {
          if (d < 0)
            sign =3D '-';
          cp =3D "Inf";
          size =3D 3;
          break;
        }
      if (__builtin_isnan (d))
        {
          cp =3D "NaN";
          size =3D 3;
          break;
        }
      if (d < 0)
        {
          d =3D -d;
          sign =3D '-';
        }
      else if (d =3D=3D 0.0 && __builtin_signbit (d))
        sign =3D '-';
      else
        sign =3D '\0';
      if (ch =3D=3D 'a' || ch =3D=3D 'A')
        {
          union U { long long l; double d; } u;
          int dsgn;
          u.d =3D d;
          if (u.l < 0)
            {
              dsgn =3D 1;
              u.l &=3D 0x7fffffffffffffffLL;
            }
          else
            dsgn =3D 0;
          if (__builtin_isinf (d))
            {
              cp =3D "INF";
              size =3D 3;
            }
          else if (__builtin_isnan (d))
            {
              cp =3D "NAN";
              size =3D 3;
            }
          else if (d =3D=3D 0)
            {
              cp =3D "ZERO";
              size =3D 4;
            }
          else
            {
              cp =3D "WRONG";
              size =3D 5;
            }
          bar (cp, size, sign, dsgn);
        }
    }
  va_end (ap);
}

int
main ()
{
  foo (42, 'a', -0.0);
  return 0;
}=