From: Dave Korn <dave.korn.cygwin@googlemail.com>
To: Basile STARYNKEVITCH <basile@starynkevitch.net>
Cc: Ian Lance Taylor <iant@google.com>, GCC Mailing List <gcc@gcc.gnu.org>
Subject: Re: very different compilation times [no optimisation]
Date: Fri, 06 Nov 2009 15:49:00 -0000 [thread overview]
Message-ID: <4AF44904.4040105@gmail.com> (raw)
In-Reply-To: <4AF443FB.6060206@starynkevitch.net>
Basile STARYNKEVITCH wrote:
>>> Notice that gcc 4.4 is running four times slower that gcc-4.3!
> glinka ~/tmp 16:39 % gcc-4.3 -ftime-report -O0 -g -fPIC
> warmelt-normal-1.i -c -o warmelt-normal-1-gcc-4.3.o
>
> Execution times (seconds)
> TOTAL : 33.13 3.33
> 36.64 363506 kB
> glinka ~/tmp 16:40 % gcc-4.4 -ftime-report -O0 -g -fPIC
> warmelt-normal-1.i -c -o warmelt-normal-1-gcc-4.4.o
> TOTAL : 10.83 3.03
> 13.90 429820 kB
> glinka ~/tmp 16:41 %
Wait, what? :-P
Assuming you got those results swapped round, I see it's mostly expand and
global alloc. Side effect of IRA on functions with loooong unbroken sequences
of initialisations maybe?
cheers,
DaveK
next prev parent reply other threads:[~2009-11-06 15:49 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-06 15:04 Basile STARYNKEVITCH
2009-11-06 15:16 ` Dave Korn
2009-11-06 15:36 ` Basile STARYNKEVITCH
2009-11-06 15:35 ` Ian Lance Taylor
2009-11-06 15:43 ` Basile STARYNKEVITCH
2009-11-06 15:49 ` Dave Korn [this message]
2009-11-06 16:00 ` Ian Lance Taylor
2009-11-06 16:48 ` Basile STARYNKEVITCH
2009-11-06 16:37 ` Basile STARYNKEVITCH
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