From: Sergei Organov <osv@topconrd.ru>
To: Andrew Pinski <pinskia@physics.uc.edu>
Cc: gcc@gcc.gnu.org
Subject: Re: How to replace -O1 with corresponding -f's?
Date: Mon, 20 Jun 2005 15:04:00 -0000 [thread overview]
Message-ID: <87vf4983yt.fsf@osv.topcon.com> (raw)
In-Reply-To: <7a7540ae909461ad920621855369549d@physics.uc.edu>
Andrew Pinski <pinskia@physics.uc.edu> writes:
> On Jun 20, 2005, at 9:38 AM, Sergei Organov wrote:
>
> > 2. The resulting assembly is different from what I get with -O1 and
> > doesn't contain the mis-optimization I'm trying to debug though it
> > doesn't seem to have anything to do with loops. For reference, the
> > code I'm trying to compile is:
> >
> > extern double const osv;
> > double const osv = 314314314;
> > double osvf() { return osv; }
>
> I don't see anything wrong with what it gives for -O0 and -O2.
Well, it's on PowerPC with its small constant data sections.
With -O1 I get:
.globl osv
.section .sdata2,"a",@progbits
.align 3
.type osv, @object
.size osv, 8
osv:
.long 1102232590
.long 1241513984
.section .rodata.cst8,"aM",@progbits,8
.align 3
.LC0:
.long 1102232590
.long 1241513984
.section ".text"
.align 2
.globl osvf
.type osvf, @function
osvf:
lis %r9,.LC0@ha # tmp121,
lfd %f1,.LC0@l(%r9) #, <result>
blr #
With -O0 and a bunch of -f's from -O1 I get:
.globl osv
.section .sdata2,"a",@progbits
.align 3
.type osv, @object
.size osv, 8
osv:
.long 1102232590
.long 1241513984
.section ".text"
.align 2
.globl osvf
.type osvf, @function
osvf:
.LFB2:
lfd %f0,osv@sda21(%r0) # osv, D.1144
fmr %f1,%f0 # <result>, <result>
blr #
While the ideal code would be:
...
osvf:
.LFB2:
lfd %f1,osv@sda21(%r0) # osv, D.1144
blr #
--
Sergei.
prev parent reply other threads:[~2005-06-20 15:04 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-20 13:40 Sergei Organov
2005-06-20 14:04 ` Andrew Haley
2005-06-20 14:26 ` Andrew Pinski
2005-06-20 14:55 ` Sergei Organov
2005-06-20 15:01 ` Andrew Pinski
2005-06-20 15:29 ` Sergei Organov
2005-06-20 15:36 ` Andrew Pinski
2005-06-20 15:58 ` Sergei Organov
2005-06-21 9:55 ` Michael Meissner
2005-06-21 12:49 ` Sergei Organov
2005-06-20 17:18 ` Sergei Organov
2005-06-24 16:09 ` Sergei Organov
2005-06-20 14:28 ` Sergei Organov
2005-06-22 19:29 ` Zack Weinberg
2005-06-20 14:25 ` Scott Robert Ladd
2005-06-20 14:35 ` Andrew Pinski
2005-06-20 15:04 ` Sergei Organov [this message]
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