From: Aldy Hernandez <aldyh@redhat.com>
To: GCC patches <gcc-patches@gcc.gnu.org>
Cc: Andrew MacLeod <amacleod@redhat.com>
Subject: Re: [COMMITTED] Improve multiplication by powers of 2 in range-ops.
Date: Mon, 7 Nov 2022 21:10:10 +0100 [thread overview]
Message-ID: <CAGm3qMUxR38_C5x7daD=puyQqCWK+F0t0-8Oo3ocEU-Z-+t5sA@mail.gmail.com> (raw)
In-Reply-To: <20221107195856.791257-1-aldyh@redhat.com>
On Mon, Nov 7, 2022 at 8:59 PM Aldy Hernandez <aldyh@redhat.com> wrote:
>
> For unsigned numbers, multiplication by X, where X is a power of 2 is
> [0,0][X,+INF].
>
> This patch causes a regression to g++.dg/pr71488.C where
> -Wstringop-overflow gets the same IL as before, but better ranges
> cause it to issue a bogus warning. I will create a PR with some
> notes.
PR107561
prev parent reply other threads:[~2022-11-07 20:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-07 19:58 Aldy Hernandez
2022-11-07 20:10 ` Aldy Hernandez [this message]
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