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Message-ID: <20190806130709.GD22009@port70.net>
Date: Tue, 6 Aug 2019 15:07:10 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: Minor arm __syscall_cp_asm optimisation
* Patrick Oppenlander <patrick.oppenlander@...il.com> [2019-08-01 16:00:16 +1000]:
> Hi all,
>
> while debugging something unrelated I noticed a minor optimisation we
> can make to __syscall_cp_asm for arm.
>
> Unless I'm missing something the only reason we needed to preserve the
> link register was because we were using a branch-link instruction to
> branch to __cp_cancel. Replacing this with a branch means we can avoid
> the save/restore as the link register is no longer modified.
the change makes sense to me.
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