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From: Andrew Pinski <pinskia@physics.uc.edu>
To: Reza Roboubi <reza@linisoft.com>
Cc: Andrew Pinski <pinskia@physics.uc.edu>,
	gcc-help <gcc-help@gcc.gnu.org>,
	"gcc@gcc.gnu.org" <gcc@gcc.gnu.org>
Subject: Re: optimizations
Date: Wed, 15 Jan 2003 17:37:00 -0000	[thread overview]
Message-ID: <8682D892-2847-11D7-A1D5-000393A6D2F2@physics.uc.edu> (raw)
In-Reply-To: <3E24B01F.3348FC3C@linisoft.com>


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.

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.

  reply	other threads:[~2003-01-15  5:10 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       ` Andrew Pinski [this message]
2003-01-15 17:46         ` optimizations Reza Roboubi
  -- 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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