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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/96373] SVE miscompilation on vectorized division loop,
 leading to FP exception
Date: Wed, 05 Aug 2020 10:15:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96373

--- Comment #7 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 5 Aug 2020, rsandifo at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96373
>=20
> --- Comment #6 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.=
org> ---
> FWIW, I think the reason I mentioned for skimping on this originally
> was that we don't e.g. prevent if-conversion of:
>=20
> void
> foo (int *c, float *f)
> {
>   for (int i =3D 0; i < 16; ++i)
>     f[i] =3D c[i] ? __builtin_sqrtf (f[i]) : f[i];
> }
>=20
> for -O2 -ftree-vectorize -fno-math-errno.  So it seemed like things
> weren't very consistent.

I think that's a bug in if-conversion - gimple_could_trap_p only
says that the call instruction itself doesn't trap, it doesn't
say anything about something in the callee body.  You should need
-fno-trapping-math to get the above if-converted.=