From: Jakub Jelinek <jakub@redhat.com>
To: "Jose E. Marchesi" <jose.marchesi@oracle.com>
Cc: gcc-patches@gcc.gnu.org
Subject: Re: [PATCH] Emit funcall external declarations only if actually used.
Date: Fri, 18 Aug 2023 18:40:20 +0200 [thread overview]
Message-ID: <ZN+e9C1OgD1f7rW5@tucnak> (raw)
In-Reply-To: <87sf8gtir5.fsf@oracle.com>
On Fri, Aug 18, 2023 at 06:31:10PM +0200, Jose E. Marchesi wrote:
> > This won't work if target can't use a direct call instruction.
> > Consider
> > __int128 a, b; void foo () { a = a / b; }
> > on x86_64-linux. With just -O2, the above works fine, with
> > -O2 -mcmodel=large it will not, the call is indirect, but at least one has
> > REG_CALL_DECL note that could be used as fallback to the above.
> > And with -O0 -mcmodel=large because flag_ipa_ra is false REG_CALL_DECL isn't
> > emitted at all.
> > So, perhaps you could emit the REG_CALL_DECL note even if !flag_ipa_ra
> > when SYMBOL_REF_LIBCALL is set?
>
> Hmm something like this?
Yes.
Jakub
next prev parent reply other threads:[~2023-08-18 16:40 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-18 13:53 Jose E. Marchesi
2023-08-18 14:19 ` Jakub Jelinek
2023-08-18 16:31 ` Jose E. Marchesi
2023-08-18 16:40 ` Jakub Jelinek [this message]
2023-11-25 9:47 Jose E. Marchesi
2023-11-28 12:04 ` Richard Sandiford
2023-11-28 15:23 ` Jose E. Marchesi
2023-11-29 5:40 ` Jose E. Marchesi
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