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From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Subject: Re: [PATCH] fix arm run-time abi string functions
Date: Sun, 18 Jun 2017 21:09:35 +0200	[thread overview]
Message-ID: <20170618190935.GJ27071@port70.net> (raw)
In-Reply-To: <alpine.LNX.2.20.13.1706182201560.21867@monopod.intra.ispras.ru>

* Alexander Monakov <amonakov@ispras.ru> [2017-06-18 22:05:59 +0300]:
> On Sun, 18 Jun 2017, Szabolcs Nagy wrote:
> > > here it's possible to hoist and deduplicate 'cmp r2, #0; bxeq lr' by placing it
> > > prior to the direction check.
> > > 
> > 
> > i dont think there is a difference
> > (either way, both functions need to do this cmp once,
> > the executed insns are the same you just changed the
> > ordering a bit)
> 
> I was pointing that out as a size optimization, but depending on alignment
> of the following code it might be pointless indeed.
> 

i dont think the size changes, only the order of instructions


  reply	other threads:[~2017-06-18 19:09 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-21  1:15 Szabolcs Nagy
2017-06-18 11:58 ` Szabolcs Nagy
2017-06-18 12:14 ` Alexander Monakov
2017-06-18 18:50   ` Szabolcs Nagy
2017-06-18 19:05     ` Alexander Monakov
2017-06-18 19:09       ` Szabolcs Nagy [this message]
2017-06-18 19:27         ` Alexander Monakov
2017-06-18 19:11     ` Szabolcs Nagy
2017-06-18 19:40       ` Szabolcs Nagy
2017-06-22 22:39         ` Rich Felker

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