From: Zdenek Dvorak <rakdver@kam.mff.cuni.cz>
To: Tom de Vries <vries@codesourcery.com>
Cc: gcc-patches@gcc.gnu.org
Subject: Re: [PATCH PR45098, 7/10] Nowrap limits iterations
Date: Mon, 30 May 2011 15:12:00 -0000 [thread overview]
Message-ID: <20110530123851.GA29240@kam.mff.cuni.cz> (raw)
In-Reply-To: <4DE110D3.8080904@codesourcery.com>
Hi,
> > The header block of the loop is bb 4, the latch block is bb 3:
> > ...
> > (gdb) p loop.header.index
> > $4 = 4
> > (gdb) p loop.latch.index
> > $5 = 3
> > ...
> >
> > The number of times the latch edge is executed, is 10.
> >
> > But loop->nb_iterations_upper_bound, or max_niter is 11:
this is a bit strange, it looks like the # of iterations estimation is setting
nb_iterations_upper_bound too conservatively (or I gave nb_iterations_upper_bound
a different semantics than I remember -- but both my memory and the comment in cfgloop.h
suggest that nb_iterations_upper_bound >= nb_iterations, i.e., that it should be 10 in your
example),
Zdenek
next prev parent reply other threads:[~2011-05-30 12:39 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-17 7:23 [PATCH, PR45098] Tom de Vries
2011-05-17 7:25 ` [PATCH, PR45098, 1/10] Tom de Vries
2011-05-19 11:17 ` [PATCH PR45098, 1/10] Proc object-size fix Tom de Vries
2011-05-17 8:12 ` [PATCH, PR45098, 2/10] Tom de Vries
2011-05-18 9:39 ` Zdenek Dvorak
2011-05-17 8:30 ` [PATCH, PR45098, 3/10] Tom de Vries
2011-05-18 10:10 ` Zdenek Dvorak
2011-05-18 13:00 ` Tom de Vries
[not found] ` <20110518152457.GA13360@kam.mff.cuni.cz>
2011-05-18 19:30 ` Tom de Vries
2011-05-17 8:32 ` [PATCH, PR45098, 4/10] Tom de Vries
2011-05-18 17:46 ` [PATCH PR45098, 4/10] Iv init cost Tom de Vries
2011-05-18 22:59 ` Zdenek Dvorak
2011-05-25 14:20 ` Richard Sandiford
2011-05-26 12:24 ` Tom de Vries
2011-05-31 15:22 ` Richard Sandiford
2011-05-17 8:37 ` [PATCH, PR45098, 5/10] Tom de Vries
2011-05-18 17:48 ` [PATCH PR45098, 5/10] Bound cost Tom de Vries
2011-05-19 4:45 ` Zdenek Dvorak
2011-05-17 8:42 ` [PATCH, PR45098, 6/10] Tom de Vries
2011-05-18 17:48 ` [PATCH PR45098, 6/10] Bound cost - test cases Tom de Vries
2011-05-17 8:58 ` [PATCH, PR45098, 7/10] Tom de Vries
2011-05-18 17:52 ` [PATCH PR45098, 7/10] Nowrap limits iterations Tom de Vries
2011-05-19 4:45 ` Zdenek Dvorak
2011-05-20 12:22 ` Tom de Vries
2011-05-21 18:54 ` Zdenek Dvorak
2011-05-21 22:53 ` Tom de Vries
2011-05-28 17:58 ` Tom de Vries
2011-05-30 15:12 ` Zdenek Dvorak [this message]
2011-05-31 9:07 ` Tom de Vries
2011-05-31 9:11 ` Zdenek Dvorak
2011-06-11 10:13 ` Tom de Vries
2011-06-12 1:17 ` Zdenek Dvorak
2011-05-23 14:50 ` H.J. Lu
2011-05-17 9:03 ` [PATCH, PR45098, 8/10] Tom de Vries
2011-05-18 18:23 ` [PATCH PR45098, 8/10] Nowrap limits iterations - test cases Tom de Vries
2011-05-18 18:27 ` [PATCH PR45098, 9/10] Cheap shift-add Tom de Vries
2011-05-19 5:33 ` Zdenek Dvorak
2011-05-20 11:32 ` Tom de Vries
2011-05-20 20:09 ` Zdenek Dvorak
2011-05-21 15:05 ` Eric Botcazou
2011-05-22 19:33 ` Tom de Vries
2011-05-22 20:22 ` Richard Guenther
2011-05-22 21:11 ` Eric Botcazou
2011-05-17 10:03 ` [PATCH, PR45098, 9/10] Tom de Vries
2011-05-17 10:30 ` [PATCH, PR45098, 10/10] Tom de Vries
2011-05-18 18:30 ` [PATCH PR45098, 10/10] Cheap shift-add - test case Tom de Vries
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