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From: "xry111 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 and pr95115.c
Date: Thu, 19 Jan 2023 01:15:17 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: missed-optimization, wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107608

--- Comment #42 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #41)
> We could fix the testcase with
>=20
> diff --git a/gcc/testsuite/gcc.dg/pr95115.c b/gcc/testsuite/gcc.dg/pr9511=
5.c
> index 69c4f83250c..09273e445d2 100644
> --- a/gcc/testsuite/gcc.dg/pr95115.c
> +++ b/gcc/testsuite/gcc.dg/pr95115.c
> @@ -17,6 +17,7 @@ int
>  main (void)
>  {
>    double r =3D x ();
> +  volatile double rr =3D r;
>    if (!__builtin_isnan (r))
>         abort ();
>    if (!fetestexcept (FE_INVALID))
>=20
> that preserves optimizing the isnan check but also preserves the computat=
ion
> and checks the non-propagation of a NaN.

Hmm, so it means we cannot rely on Inf / Inf to raise an exception?  Then we
need to fix Glibc...=