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From: "xry111 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/112483] [14 Regression]
 gfortran.dg/ieee/ieee_2.f90 fails on loongarch64-linux-gnu at -O1 or above
Date: Mon, 13 Nov 2023 08:44:10 +0000
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X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization, testsuite-fail, wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112483

--- Comment #17 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
(In reply to Xi Ruoyao from comment #16)
> (In reply to Andrew Pinski from comment #12)
> > What about this patch:
> > ```
> > diff --git a/gcc/simplify-rtx.cc b/gcc/simplify-rtx.cc
> > index 69d87579d9c..f3745d86aea 100644
> > --- a/gcc/simplify-rtx.cc
> > +++ b/gcc/simplify-rtx.cc
> > @@ -4392,7 +4392,7 @@ simplify_ashift:
> >           real_convert (&f1, mode, CONST_DOUBLE_REAL_VALUE (trueop1));
> >           rtx tmp =3D simplify_gen_unary (ABS, mode, op0, mode);
> >           if (REAL_VALUE_NEGATIVE (f1))
> > -           tmp =3D simplify_gen_unary (NEG, mode, op0, mode);
> > +           tmp =3D simplify_unary_operation (NEG, mode, tmp, mode);
> >           return tmp;
> >         }
> >        if (GET_CODE (op0) =3D=3D NEG || GET_CODE (op0) =3D=3D ABS)
> >=20
> > ```
> >=20
> > We only generate NEG if it simplifies from the ABS. Most likely due to
> > constants.
>=20
> I'm trying this out on LoongArch.

Works for me.  Will you send the simplify_gen_unary -> simplify_unary_opera=
tion
change to gcc-patches?=