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* [Bug tree-optimization/18529] New: When the lower bound of a loop is non-constant we cannot find the number of iterations
@ 2004-11-17 15:43 pinskia at gcc dot gnu dot org
2004-11-17 15:45 ` [Bug tree-optimization/18529] " pinskia at gcc dot gnu dot org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-11-17 15:43 UTC (permalink / raw)
To: gcc-bugs
long *a;
void f(int start, int end)
{
int i;
for (i = start; i <end ; i++)
a[i] = 0;
}
Some anylsis of the problem here: <http://gcc.gnu.org/ml/gcc/2004-08/msg01315.html>.
I filed this to keep track of it.
--
Summary: When the lower bound of a loop is non-constant we cannot
find the number of iterations
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18529
^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug tree-optimization/18529] When the lower bound of a loop is non-constant we cannot find the number of iterations 2004-11-17 15:43 [Bug tree-optimization/18529] New: When the lower bound of a loop is non-constant we cannot find the number of iterations pinskia at gcc dot gnu dot org @ 2004-11-17 15:45 ` pinskia at gcc dot gnu dot org 2004-11-18 14:01 ` rakdver at gcc dot gnu dot org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-11-17 15:45 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-11-17 15:44 ------- Note this is like PR 18527 but a different problem (I don't know how offten this shows up in SPEC but I found this when I was working on my loops to memset pass). -- What |Removed |Added ---------------------------------------------------------------------------- CC| |rakdver at gcc dot gnu dot | |org Status|UNCONFIRMED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2004-11-17 15:44:58 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18529 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/18529] When the lower bound of a loop is non-constant we cannot find the number of iterations 2004-11-17 15:43 [Bug tree-optimization/18529] New: When the lower bound of a loop is non-constant we cannot find the number of iterations pinskia at gcc dot gnu dot org 2004-11-17 15:45 ` [Bug tree-optimization/18529] " pinskia at gcc dot gnu dot org @ 2004-11-18 14:01 ` rakdver at gcc dot gnu dot org 2004-11-18 21:54 ` rakdver at gcc dot gnu dot org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: rakdver at gcc dot gnu dot org @ 2004-11-18 14:01 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|unassigned at gcc dot gnu |rakdver at gcc dot gnu dot |dot org |org Status|NEW |ASSIGNED http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18529 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/18529] When the lower bound of a loop is non-constant we cannot find the number of iterations 2004-11-17 15:43 [Bug tree-optimization/18529] New: When the lower bound of a loop is non-constant we cannot find the number of iterations pinskia at gcc dot gnu dot org 2004-11-17 15:45 ` [Bug tree-optimization/18529] " pinskia at gcc dot gnu dot org 2004-11-18 14:01 ` rakdver at gcc dot gnu dot org @ 2004-11-18 21:54 ` rakdver at gcc dot gnu dot org 2004-11-22 21:34 ` cvs-commit at gcc dot gnu dot org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: rakdver at gcc dot gnu dot org @ 2004-11-18 21:54 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From rakdver at gcc dot gnu dot org 2004-11-18 21:54 ------- Patch: http://gcc.gnu.org/ml/gcc-patches/2004-11/msg01516.html -- What |Removed |Added ---------------------------------------------------------------------------- Keywords| |patch http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18529 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/18529] When the lower bound of a loop is non-constant we cannot find the number of iterations 2004-11-17 15:43 [Bug tree-optimization/18529] New: When the lower bound of a loop is non-constant we cannot find the number of iterations pinskia at gcc dot gnu dot org ` (2 preceding siblings ...) 2004-11-18 21:54 ` rakdver at gcc dot gnu dot org @ 2004-11-22 21:34 ` cvs-commit at gcc dot gnu dot org 2004-11-22 21:34 ` rakdver at gcc dot gnu dot org 2004-12-01 0:40 ` pinskia at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: cvs-commit at gcc dot gnu dot org @ 2004-11-22 21:34 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From cvs-commit at gcc dot gnu dot org 2004-11-22 21:33 ------- Subject: Bug 18529 CVSROOT: /cvs/gcc Module name: gcc Changes by: rakdver@gcc.gnu.org 2004-11-22 21:33:48 Modified files: gcc : ChangeLog fold-const.c tree-ssa-loop-niter.c Log message: PR tree-optimization/18529 * fold-const.c (fold_to_nonsharp_ineq_using_bound): New function. (simple_operand_p): Use STRIP_NOPS. Consider SSA names simple. (fold): Call fold_to_nonsharp_ineq_using_bound. * tree-ssa-loop-niter.c (simplify_replace_tree): New function. (number_of_iterations_cond): Fold the expressions before futher processing. (tree_simplify_using_condition): Handle case when cond or expr is an EQ_EXPR specially. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.6459&r2=2.6460 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/fold-const.c.diff?cvsroot=gcc&r1=1.475&r2=1.476 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-ssa-loop-niter.c.diff?cvsroot=gcc&r1=2.16&r2=2.17 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18529 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/18529] When the lower bound of a loop is non-constant we cannot find the number of iterations 2004-11-17 15:43 [Bug tree-optimization/18529] New: When the lower bound of a loop is non-constant we cannot find the number of iterations pinskia at gcc dot gnu dot org ` (3 preceding siblings ...) 2004-11-22 21:34 ` cvs-commit at gcc dot gnu dot org @ 2004-11-22 21:34 ` rakdver at gcc dot gnu dot org 2004-12-01 0:40 ` pinskia at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: rakdver at gcc dot gnu dot org @ 2004-11-22 21:34 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From rakdver at gcc dot gnu dot org 2004-11-22 21:34 ------- Fixed. -- What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution| |FIXED http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18529 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/18529] When the lower bound of a loop is non-constant we cannot find the number of iterations 2004-11-17 15:43 [Bug tree-optimization/18529] New: When the lower bound of a loop is non-constant we cannot find the number of iterations pinskia at gcc dot gnu dot org ` (4 preceding siblings ...) 2004-11-22 21:34 ` rakdver at gcc dot gnu dot org @ 2004-12-01 0:40 ` pinskia at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-12-01 0:40 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |4.0.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18529 ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2004-12-01 0:40 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2004-11-17 15:43 [Bug tree-optimization/18529] New: When the lower bound of a loop is non-constant we cannot find the number of iterations pinskia at gcc dot gnu dot org 2004-11-17 15:45 ` [Bug tree-optimization/18529] " pinskia at gcc dot gnu dot org 2004-11-18 14:01 ` rakdver at gcc dot gnu dot org 2004-11-18 21:54 ` rakdver at gcc dot gnu dot org 2004-11-22 21:34 ` cvs-commit at gcc dot gnu dot org 2004-11-22 21:34 ` rakdver at gcc dot gnu dot org 2004-12-01 0:40 ` pinskia at gcc dot gnu dot org
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