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From: "sgk at troutmask dot apl.washington.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/109865] different results when routine moved inside the
 contains statement
Date: Mon, 15 May 2023 19:24:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109865

--- Comment #4 from Steve Kargl <sgk at troutmask dot apl.washington.edu> -=
--
On Mon, May 15, 2023 at 07:11:17PM +0000, Gary.White at ColoState dot edu
wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109865
> (In reply to kargl from comment #2)
> > (In reply to GARY.WHITE@ColoState.edu from comment #0)
> >=20
> > > Options being used to compile the code:
> > > 	COPTIONS =3D -cpp -std=3Df2018 -c -D ieee -D dbleprecision -m64
> > > -fsignaling-nans -ffpe-summary=3D'invalid','zero','overflow','underfl=
ow' -O3
> > > -funroll-loops -ffast-math=20
> >=20
> > What happens if you remove -ffast-math and use -O0 or -O1?
>=20
> -O0 generates correct code with or without -ffastmath, -O1 does not gener=
ate
> correct code.

I assume you've also tried with -fcheck=3Dall.
Your report states you're using og12.  If=20
it supports the sanitizer, can you add=20
-fsanitize=3Dundefined to the options?=