From: Reza Roboubi <reza@linisoft.com>
To: Andrew Pinski <pinskia@physics.uc.edu>
Cc: gcc-help <gcc-help@gcc.gnu.org>,
"gcc@gcc.gnu.org" <gcc@gcc.gnu.org>,
gcc_bugs <gcc-bugs@gcc.gnu.org>
Subject: Re: optimizations
Date: Wed, 15 Jan 2003 17:46:00 -0000 [thread overview]
Message-ID: <3E24FF9B.86EA1F59@linisoft.com> (raw)
In-Reply-To: <8682D892-2847-11D7-A1D5-000393A6D2F2@physics.uc.edu>
Andrew Pinski wrote:
>
> On Tuesday, Jan 14, 2003, at 16:49 US/Pacific, Reza Roboubi wrote:
>
> > Could you please also tell me if 3.3 and 3.4 remove the extra mov's in
> > and out
> > of %eax. Ideally, there should be no more than 4 instructions in the
> > critical
> > loop.
> >
>
> For some reason it is not (even with -fnew-ra), but on PPC there is no
> extra load/store.
Hmmm. That's interesting. It might be a bug (or overlooked opportunity) on the
PC.
>
> Thanks,
> Andrew Pinski
>
> PS here is the asm for the loop of i[3-6]686, pentium4:
>
> .L2:
> movl -4(%ebp), %eax <== still does the store
> cmpl $16, %eax
> je .L7
> incl %eax
> movl %eax, -4(%ebp) <== and load
> jmp .L2
> .L7:
>
> I do not have access to the machine with 3.{3,4} on PPC right now.
I really appreciate your help Andrew.
Reza.
next prev parent reply other threads:[~2003-01-15 6:31 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-14 22:58 optimizations Reza Roboubi
2003-01-15 0:15 ` optimizations Andrew Pinski
2003-01-15 5:10 ` optimizations Reza Roboubi
2003-01-15 6:31 ` optimizations Reza Roboubi
2003-01-15 17:37 ` optimizations Andrew Pinski
2003-01-15 17:46 ` Reza Roboubi [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-01-15 23:20 optimizations Bonzini
2003-01-16 10:53 ` optimizations Reza Roboubi
2003-01-16 11:03 ` optimizations tm_gccmail
2003-01-16 12:34 ` optimizations Reza Roboubi
2003-02-18 18:13 ` optimizations Håkan Hjort
2003-02-18 18:16 ` optimizations Andrew Pinski
2003-02-18 18:17 ` optimizations Zack Weinberg
2003-02-18 18:40 ` optimizations Håkan Hjort
2003-02-19 5:02 ` optimizations David Edelsohn
2003-01-16 11:53 ` optimizations Paolo Bonzini
2000-03-10 1:46 Optimizations Virgil Palanciuc
1997-12-14 14:30 [EGCS] Optimizations meissner
1997-12-15 5:38 ` Optimizations Marc Lehmann
1997-12-15 11:29 ` Optimizations Dave Love
1997-12-15 15:43 ` Optimizations Marc Lehmann
[not found] ` <19971216000653.24186.cygnus.egcs@cerebro.laendle>
1997-12-23 7:51 ` Optimizations Stan Cox
1997-12-09 9:52 Optimizations David M. Ronis
1997-12-09 11:19 ` Optimizations Jeffrey A Law
1997-12-10 10:46 ` [EGCS] Optimizations Marc Lehmann
1997-12-14 5:39 ` Philipp Thomas
1997-12-14 15:14 ` Optimizations Marc Lehmann
1997-12-14 20:14 ` Optimizations Jeffrey A Law
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