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* [Bug tree-optimization/22312] reassoc does not handle (i+j)+(k+l) well [not found] <bug-22312-6528@http.gcc.gnu.org/bugzilla/> @ 2005-12-13 4:29 ` pinskia at gcc dot gnu dot org 0 siblings, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-12-13 4:29 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from pinskia at gcc dot gnu dot org 2005-12-13 04:29 ------- Fixed. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED Target Milestone|--- |4.2.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22312 ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/22312] New: reassoc does not handle (i+j)+(k+l) well
@ 2005-07-05 18:33 pinskia at gcc dot gnu dot org
2005-07-05 19:02 ` [Bug tree-optimization/22312] " dberlin at dberlin dot org
2005-07-05 19:36 ` pinskia at gcc dot gnu dot org
0 siblings, 2 replies; 3+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-07-05 18:33 UTC (permalink / raw)
To: gcc-bugs
take the following example:
int f(int i, int j, int k, int l)
{
int r1 = (i+j)+(k+l);
int r2 = (j+k)+(l+i);
return r1 == r2;
}
This should return 1 all the time. I found this while making testcases for reassoc working fp (well I just
change one little thing to make it work really).
--
Summary: reassoc does not handle (i+j)+(k+l) well
Product: gcc
Version: 4.1.0
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=22312
^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug tree-optimization/22312] reassoc does not handle (i+j)+(k+l) well 2005-07-05 18:33 [Bug tree-optimization/22312] New: " pinskia at gcc dot gnu dot org @ 2005-07-05 19:02 ` dberlin at dberlin dot org 2005-07-05 19:36 ` pinskia at gcc dot gnu dot org 1 sibling, 0 replies; 3+ messages in thread From: dberlin at dberlin dot org @ 2005-07-05 19:02 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From dberlin at gcc dot gnu dot org 2005-07-05 19:02 ------- Subject: Re: New: reassoc does not handle (i+j)+(k+l) well On Tue, 2005-07-05 at 18:33 +0000, pinskia at gcc dot gnu dot org wrote: > take the following example: > int f(int i, int j, int k, int l) > { > int r1 = (i+j)+(k+l); > int r2 = (j+k)+(l+i); > return r1 == r2; > } > > This should return 1 all the time. I found this while making testcases for reassoc working fp (well I just > change one little thing to make it work really). We can't do a full top-down reassocation because update_stmt reorders our operands so we lose information about which is the high ranked operand, etc. It's a pain in the ass to fix, but possible. > -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22312 ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/22312] reassoc does not handle (i+j)+(k+l) well 2005-07-05 18:33 [Bug tree-optimization/22312] New: " pinskia at gcc dot gnu dot org 2005-07-05 19:02 ` [Bug tree-optimization/22312] " dberlin at dberlin dot org @ 2005-07-05 19:36 ` pinskia at gcc dot gnu dot org 1 sibling, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-07-05 19:36 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-07-05 19:35 ------- Confirmed then. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2005-07-05 19:35:57 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22312 ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2005-12-13 4:29 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <bug-22312-6528@http.gcc.gnu.org/bugzilla/>
2005-12-13 4:29 ` [Bug tree-optimization/22312] reassoc does not handle (i+j)+(k+l) well pinskia at gcc dot gnu dot org
2005-07-05 18:33 [Bug tree-optimization/22312] New: " pinskia at gcc dot gnu dot org
2005-07-05 19:02 ` [Bug tree-optimization/22312] " dberlin at dberlin dot org
2005-07-05 19:36 ` pinskia at gcc dot gnu dot org
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