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* [Bug tree-optimization/30102] New: missed strength reduction optimization (irreducible loops)
@ 2006-12-07 6:00 dann at godzilla dot ics dot uci dot edu
2006-12-07 14:16 ` [Bug tree-optimization/30102] " rguenth at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: dann at godzilla dot ics dot uci dot edu @ 2006-12-07 6:00 UTC (permalink / raw)
To: gcc-bugs
The following 2 functions should be compiled to the same assembly.
This is one of Briggs' compiler benchmarks.
void strength_test4(int *data)
{
int i;
if (data[1]) {
i = 2;
goto here;
}
i = 0;
do {
i = i + 1;
here:
data[data[2]] = 2;
} while (i * 21 < data[3]);
}
void strength_result4(int *data)
{
int i;
if (data[1]) {
i = 42;
goto here;
}
i = 0;
do {
i = i + 21;
here:
data[data[2]] = 2;
} while (i < data[3]);
}
--
Summary: missed strength reduction optimization (irreducible
loops)
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: dann at godzilla dot ics dot uci dot edu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30102
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/30102] missed strength reduction optimization (irreducible loops)
2006-12-07 6:00 [Bug tree-optimization/30102] New: missed strength reduction optimization (irreducible loops) dann at godzilla dot ics dot uci dot edu
@ 2006-12-07 14:16 ` rguenth at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2006-12-07 14:16 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from rguenth at gcc dot gnu dot org 2006-12-07 14:16 -------
Confirmed.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu dot
| |org
Severity|normal |enhancement
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Keywords| |missed-optimization
Last reconfirmed|0000-00-00 00:00:00 |2006-12-07 14:16:12
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30102
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2006-12-07 6:00 [Bug tree-optimization/30102] New: missed strength reduction optimization (irreducible loops) dann at godzilla dot ics dot uci dot edu
2006-12-07 14:16 ` [Bug tree-optimization/30102] " rguenth at gcc dot gnu dot org
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