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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107608] [13 Regression] Failure on
 fold-overflow-1.c
Date: Thu, 10 Nov 2022 18:13:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107608

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
> With -fnon-call-exceptions we are a bit more careful (but the above is go=
ne
> in the gimplifier still).

For -fnon-call-exceptions, you need -fno-delete-dead-exceptions (it looks l=
ike
the gimplifier is broken there).
That is for:
```
float foo(void)
{
  float t;
  t =3D  __FLT_MAX__ + __FLT_MAX__;
  return 1;
}
```
To keep around the addition, you need both -fnon-call-exceptions and
-fno-delete-dead-exceptions .
I know there has been issues with where we still DCE code with
-fno-delete-dead-exceptions (I fixed one last year).=