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* [Bug tree-optimization/21883] New: tree-ssa-dom.c causing excessive code duplication
@ 2005-06-02 18:55 jakub at gcc dot gnu dot org
2005-06-02 19:04 ` [Bug tree-optimization/21883] [4.1 Regression] jump threading " pinskia at gcc dot gnu dot org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: jakub at gcc dot gnu dot org @ 2005-06-02 18:55 UTC (permalink / raw)
To: gcc-bugs
extern int foo1 (void), foo2 (int);
int bar (int x)
{
int varvar1, varvar2;
int z;
if (x > 913)
varvar1 = foo1 ();
else
varvar2 = foo2 (6);
#define A foo1 (); foo1 (); foo1 (); foo1 (); foo1 ();
#define B A A A A A A A A A A
#define C B B B B B B B B B B
C C C C C C C C C C C
if (x > 913)
z = varvar1 + foo1 ();
else
z = varvar2 + foo2 (6);
return z;
}
Current HEAD will duplicate all the 2500 foo1 () calls to save a if (x > 913)
comparison. With -Os almost no duplication should be allowed (only if the
duplicated instructions are expected to be shorter than the compare and branch),
and even with -O2 there should be some sensible limit.
--
Summary: tree-ssa-dom.c causing excessive code duplication
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jakub at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21883
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug tree-optimization/21883] [4.1 Regression] jump threading causing excessive code duplication 2005-06-02 18:55 [Bug tree-optimization/21883] New: tree-ssa-dom.c causing excessive code duplication jakub at gcc dot gnu dot org @ 2005-06-02 19:04 ` pinskia at gcc dot gnu dot org 2005-07-12 6:43 ` pinskia at gcc dot gnu dot org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-06-02 19:04 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-06-02 19:04 ------- Confirmed, a regression from 4.0.0. -- What |Removed |Added ---------------------------------------------------------------------------- OtherBugsDependingO| |16996 nThis| | Status|UNCONFIRMED |NEW Ever Confirmed| |1 Keywords| |missed-optimization Last reconfirmed|0000-00-00 00:00:00 |2005-06-02 19:04:47 date| | Summary|tree-ssa-dom.c causing |[4.1 Regression] jump |excessive code duplication |threading causing excessive | |code duplication Target Milestone|--- |4.1.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21883 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/21883] [4.1 Regression] jump threading causing excessive code duplication 2005-06-02 18:55 [Bug tree-optimization/21883] New: tree-ssa-dom.c causing excessive code duplication jakub at gcc dot gnu dot org 2005-06-02 19:04 ` [Bug tree-optimization/21883] [4.1 Regression] jump threading " pinskia at gcc dot gnu dot org @ 2005-07-12 6:43 ` pinskia at gcc dot gnu dot org 2005-09-01 11:23 ` steven at gcc dot gnu dot org 2005-09-01 11:37 ` steven at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-07-12 6:43 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- CC| |law at gcc dot gnu dot org Last reconfirmed|2005-06-02 19:04:47 |2005-07-12 06:25:35 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21883 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/21883] [4.1 Regression] jump threading causing excessive code duplication 2005-06-02 18:55 [Bug tree-optimization/21883] New: tree-ssa-dom.c causing excessive code duplication jakub at gcc dot gnu dot org 2005-06-02 19:04 ` [Bug tree-optimization/21883] [4.1 Regression] jump threading " pinskia at gcc dot gnu dot org 2005-07-12 6:43 ` pinskia at gcc dot gnu dot org @ 2005-09-01 11:23 ` steven at gcc dot gnu dot org 2005-09-01 11:37 ` steven at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: steven at gcc dot gnu dot org @ 2005-09-01 11:23 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From steven at gcc dot gnu dot org 2005-09-01 11:22 ------- This also appears to be a source of compile time problems. -- What |Removed |Added ---------------------------------------------------------------------------- Keywords| |compile-time-hog Priority|P2 |P1 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21883 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/21883] [4.1 Regression] jump threading causing excessive code duplication 2005-06-02 18:55 [Bug tree-optimization/21883] New: tree-ssa-dom.c causing excessive code duplication jakub at gcc dot gnu dot org ` (2 preceding siblings ...) 2005-09-01 11:23 ` steven at gcc dot gnu dot org @ 2005-09-01 11:37 ` steven at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: steven at gcc dot gnu dot org @ 2005-09-01 11:37 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From steven at gcc dot gnu dot org 2005-09-01 11:37 ------- I'll have a look at this. -- What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|unassigned at gcc dot gnu |steven at gcc dot gnu dot |dot org |org Status|NEW |ASSIGNED Last reconfirmed|2005-07-12 06:25:35 |2005-09-01 11:37:24 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21883 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2005-09-01 11:37 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-06-02 18:55 [Bug tree-optimization/21883] New: tree-ssa-dom.c causing excessive code duplication jakub at gcc dot gnu dot org 2005-06-02 19:04 ` [Bug tree-optimization/21883] [4.1 Regression] jump threading " pinskia at gcc dot gnu dot org 2005-07-12 6:43 ` pinskia at gcc dot gnu dot org 2005-09-01 11:23 ` steven at gcc dot gnu dot org 2005-09-01 11:37 ` steven at gcc dot gnu dot org
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