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From: "René Scharfe" <l.s.r@web.de>
To: Duy Nguyen <pclouds@gmail.com>, Jeff King <peff@peff.net>
Cc: Christian Couder <christian.couder@gmail.com>,
	Thomas Gummerer <t.gummerer@gmail.com>, git <git@vger.kernel.org>,
	Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH] cache-tree: reject entries with null sha1
Date: Wed, 3 May 2017 21:48:31 +0200	[thread overview]
Message-ID: <cddd09e5-8e8a-3dc9-001f-f307d3647619@web.de> (raw)
In-Reply-To: <CACsJy8CdjLySD+UEKE2NkbYqEoVOQtvydFBui6UbbnFLo8U1Ug@mail.gmail.com>

Am 03.05.2017 um 11:46 schrieb Duy Nguyen:
> On Tue, May 2, 2017 at 2:22 AM, Jeff King <peff@peff.net> wrote:
>> On Mon, May 01, 2017 at 01:23:28PM +0200, René Scharfe wrote:
>>>
>>> I can only get gcc and clang to call memcpy instead of inlining it by
>>> specifying -fno-builtin.  Do you use that option?  If yes, why?  (Just
>>> curious.)
>>
>> I do my normal edit-compile cycles with -O0 because it's fast, and
>> because it makes debugging much easier.
> 
> Same here. My CFLAGS (without lots of -Wstuff)
> 
> CFLAGS =  -g -O0 -fstack-protector
> 
> Maybe it's -fstack-protector then? This is gcc 4.9.3. I think Gentoo
> does not add any distro-specific patches on this particular version.

gcc 4.9.2 on Debian i386 still inlines memcpy for me with these options.

https://packages.debian.org/jessie/gcc-4.9 links to a 5MB diff, and it
adds these lines to NEWS.gcc (plus changing a whole lot of other files,
of course):

+ - Better inlining of memcpy and memset that is aware of value ranges
+   and produces shorter alignment prologues.

That might be it.

René

      reply	other threads:[~2017-05-03 19:48 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-21 18:46 [PATCH] cache-tree: reject entries with null sha1 Jeff King
2017-04-24 10:39 ` Duy Nguyen
2017-04-24 11:13   ` Jeff King
2017-05-01 11:23   ` René Scharfe
2017-05-01 11:55     ` René Scharfe
2017-05-01 19:22     ` Jeff King
2017-05-01 21:00       ` René Scharfe
2017-05-01 21:26         ` Jeff King
2017-05-03  9:46       ` Duy Nguyen
2017-05-03 19:48         ` René Scharfe [this message]

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