From: Denis Chertykov <chertykov@gmail.com>
To: Georg-Johann Lay <avr@gjlay.de>
Cc: gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: [patch,avr] Fix PR60300: Minor prologue improvement.
Date: Tue, 22 Nov 2016 18:23:00 -0000 [thread overview]
Message-ID: <CADOs=zZ3WMUe4y+XVfZkAM=xGtBRpaCNABxs7j137QieQMGJ8w@mail.gmail.com> (raw)
In-Reply-To: <e112ba96-8ef6-f3d8-2b9a-f1f93fdfca27@gjlay.de>
2016-11-22 15:41 GMT+03:00 Georg-Johann Lay <avr@gjlay.de>:
> This patch is a minor improvement of prologue length. It now allows frame
> sizes of up to 11 to be allocated by RCALL + PUSH 0 sequences but limits the
> number of RCALLs to 3.
>
> The PR has some discussion on size vs. speed consideration w.r. to using
> RCALL in prologues, and following that I picked the rather arbitrary upper
> bound of 3 RCALLs. The prior maximal frame size opt to such sequences was 6
> which also never produced more than 3 RCALLs.
>
> Ok for trunk?
>
>
> Johann
>
> gcc/
> PR target/60300
> * config/avr/constraints.md (Csp): Widen range to [-11..6].
> * config/avr/avr.c (avr_prologue_setup_frame): Limit number
> of RCALLs in prologue to 3.
Approved.
prev parent reply other threads:[~2016-11-22 18:23 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-22 12:42 Georg-Johann Lay
2016-11-22 18:23 ` Denis Chertykov [this message]
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