From: Aldy Hernandez <aldyh@redhat.com>
To: Jakub Jelinek <jakub@redhat.com>
Cc: GCC patches <gcc-patches@gcc.gnu.org>,
Richard Biener <richard.guenther@gmail.com>,
Andrew MacLeod <amacleod@redhat.com>
Subject: Re: [PATCH] Handle > INF and < INF correctly in range-op-float.cc
Date: Tue, 6 Sep 2022 09:49:55 +0200 [thread overview]
Message-ID: <CAGm3qMVeTQFbovfbvQwnDkREFW1ZweXEWrM19gTaz9HWF=2YLw@mail.gmail.com> (raw)
In-Reply-To: <Yxb6T6NoDmOQMvRu@tucnak>
On Tue, Sep 6, 2022 at 9:44 AM Jakub Jelinek <jakub@redhat.com> wrote:
>
> On Tue, Sep 06, 2022 at 09:40:59AM +0200, Aldy Hernandez wrote:
> > if (x <= Inf)
>
> This will be [-Inf, Inf] !NAN on the true side and
> NAN (either sign) on the false side indeed.
>
> > if (x < -Inf)
>
> will be NAN (either sign) on the true side and
> [-Inf, Inf] !NAN on the false side.
Sweet, that's exactly what I thought, thus the patch.
Furthermore, for !HONOR_NANS I would expect the NAN sides above to be
UNDEFINED/unreachable. That is, the false side of x <= Inf when
!HONOR_NANS is unreachable.
Agreed?
Aldy
next prev parent reply other threads:[~2022-09-06 7:50 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-06 7:29 Aldy Hernandez
2022-09-06 7:35 ` Jakub Jelinek
2022-09-06 7:40 ` Aldy Hernandez
2022-09-06 7:44 ` Jakub Jelinek
2022-09-06 7:49 ` Aldy Hernandez [this message]
2022-09-06 7:59 ` Jakub Jelinek
2022-09-06 11:47 ` Aldy Hernandez
2022-09-06 12:06 ` Jakub Jelinek
2022-09-06 12:17 ` Richard Biener
2022-09-06 12:32 ` Aldy Hernandez
2022-09-06 12:38 ` Koning, Paul
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