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* [Bug tree-optimization/19827] New: Missed pure/const optimization
@ 2005-02-09 3:09 pinskia at gcc dot gnu dot org
2005-02-20 19:41 ` [Bug tree-optimization/19827] " pinskia at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-02-09 3:09 UTC (permalink / raw)
To: gcc-bugs
The following two function should produce the same asm because we can skip the second call to f:
int f(void) __attribute__((const,pure));
int g(int i, int j)
{
int k = 0;
if(i)
k = f();
if (j)
k = f();
return k;
}
int h(int i, int j)
{
int k = 0;
if(i)
k = f();
else if (j)
k = f();
return k;
}
--
Summary: Missed pure/const optimization
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=19827
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tree-optimization/19827] Missed pure/const optimization
2005-02-09 3:09 [Bug tree-optimization/19827] New: Missed pure/const optimization pinskia at gcc dot gnu dot org
@ 2005-02-20 19:41 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-02-20 19:41 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-02-20 14:22 -------
Confirmed.
Well h is still not the most optimal code, the following is:
int m(int i, int j)
{
int k = 0;
if(i || j)
k = f();
return k;
}
This is very closely related to PR 20083.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2005-02-20 14:22:28
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19827
^ permalink raw reply [flat|nested] 2+ messages in thread
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2005-02-09 3:09 [Bug tree-optimization/19827] New: Missed pure/const optimization pinskia at gcc dot gnu dot org
2005-02-20 19:41 ` [Bug tree-optimization/19827] " pinskia at gcc dot gnu dot org
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