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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