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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107021] [13 Regression] 511.povray_r error
 with -Ofast -march=znver2 -flto since r13-2810-gb7fd7fb5011106
Date: Mon, 26 Sep 2022 09:17:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107021

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |13.0

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw,

make check-gcc RUNTESTFLAGS=3D"--target_board=3Dunix/-march=3Dznver2/-Ofast
vect.exp=3Dvect-tsvc-s1281.c"

doesn't work to reproduce since the harness appends -O2, but I can reproduce
with -Ofast -mavx2 on trunk.

value: inf, expected: inf

because

    } else if (!strcmp(name, "s1281")) {
        return INFINITY;

and

tatic _Bool is_checksum_same(real_t expected, real_t value)
{
  if (expected =3D=3D INFINITY)
      return value =3D=3D INFINITY;

is likely optimized away and we end up in

  else {
      real_t fraction =3D value / expected;
      return 0.99f <=3D fraction && fraction <=3D 1.01f;

so I'd call that a testsuite issue.

Do we know what goes wrong with povray?=