linux-kernel - Re: [PATCH] common implementation of iterative div/mod

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Message-ID: <482AC467.1060100@goop.org>
Date:	Wed, 14 May 2008 11:52:23 +0100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Segher Boessenkool <segher@...nel.crashing.org>,
	Robert Hancock <hancockr@...w.ca>,
	Christian Kujau <lists@...dbynature.de>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	john stultz <johnstul@...ibm.com>
Subject: Re: [PATCH] common implementation of iterative div/mod

Andi Kleen wrote:
> Jeremy Fitzhardinge wrote:
>   
>> Andi Kleen wrote:
>>     
>>> You would need to annotate it and have a separate object file for the
>>> different sections. Also it would need to be compiled PIC.
>>>
>>> Inlining is better.
>>>       
>> BTW, I'm seeing the memcpy() in __vdso_gettimeofday() not being inlined.
>>     
>
> Hmm works here. What compiler do you use? Normally gcc should 
> recognize the memcpy is just two constant stores and always inline even with -Os.
>   

It's:
jeremy@...worth:~/hg/xen/paravirt/linux-x86_64$ gcc -v
Reading specs from /usr/lib/gcc/x86_64-linux/3.4.4/specs
Configured with: ../src/configure -v 
--enable-languages=c,c++,java,f77,pascal,objc,ada,treelang --prefix=/usr 
--libexecdir=/usr/lib --with-gxx-include-dir=/usr/include/c++/3.4 
--enable-shared --with-system-zlib --enable-nls 
--without-included-gettext --program-suffix=-3.4 --enable-__cxa_atexit 
--enable-libstdcxx-allocator=mt --enable-clocale=gnu 
--enable-libstdcxx-debug --enable-java-gc=boehm --enable-java-awt=gtk 
--disable-werror x86_64-linux
Thread model: posix
gcc version 3.4.4 20050314 (prerelease) (Debian 3.4.3-13)

I think this is still a supported compiler, isn't it?

    J
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