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Date: Mon, 08 Jun 2015 11:24:00 -0000
From: Joseph Myers <joseph@codesourcery.com>
To: =?ISO-8859-2?Q?Ond=F8ej_B=EDlka?= <neleai@seznam.cz>
CC: <libc-alpha@sourceware.org>
Subject: Re: [PATCH 2/*] Remove pre-gcc 3.4 string inline optimizations.
In-Reply-To: <20150608093428.GA19347@domone>
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References: <20150524150715.GA31589@domone> <20150524152706.GB31589@domone> <alpine.DEB.2.10.1505281603560.16930@digraph.polyomino.org.uk> <20150608093428.GA19347@domone>
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On Mon, 8 Jun 2015, Ondřej Bílka wrote:

> On Thu, May 28, 2015 at 04:05:56PM +0000, Joseph Myers wrote:
> > On Sun, 24 May 2015, Ondřej Bílka wrote:
> > 
> > > -/* GCC < 3.0 optimizes memset(s, 0, n) but not bzero(s, n).
> > > -   The optimization is broken before EGCS 1.1.
> > > -   GCC 3.0+ has __builtin_bzero as well, but at least till GCC 3.4
> > > -   if it decides to call the library function, it calls memset
> > > -   and not bzero.  */
> > > -# if __GNUC_PREREQ (2, 91)
> > > -#  define __bzero(s, n) __builtin_memset (s, '\0', n)
> > > -# endif
> > 
> > It looks like you're removing a definition that would be used with current 
> > GCC here.
> > 
> As comment says its unnecessary as gcc 4 converts bzero to memset as
> this header tries.

This macro definition is of __bzero, not bzero.  GCC does not do anything 
special with __bzero.

-- 
Joseph S. Myers
joseph@codesourcery.com
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