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* [Bug tree-optimization/18755] New: invariant/constant not recomputed when ADDR_EXPR changed
@ 2004-12-01 14:42 pinskia at gcc dot gnu dot org
2004-12-06 5:01 ` [Bug tree-optimization/18755] " pinskia at gcc dot gnu dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-12-01 14:42 UTC (permalink / raw)
To: gcc-bugs
Take the following code:
struct X { float array[4]; };
X a,b;
float foobar () {
float s = 0;
X c;
for (unsigned int d=0; d<4; ++d)
c.array[d] = a.array[d] * b.array[d];
for (unsigned int d=0; d<4; ++d)
s+=c.array[d];
return s;
}
With -O3 -funroll-loops, we get in .vars:
c.array[0] = a.array[0] * b.array[0];
c.array[1] = a.array[1] * b.array[1];
c.array[2] = a.array[2] * b.array[2];
ivtmp.34 = &a.array[3];
ivtmp.38 = &b.array[3];
ivtmp.40 = &c.array[3];
D.1572 = *ivtmp.34 * *ivtmp.38;
*ivtmp.40 = D.1572;
return D.1572 + c.array[0] + c.array[1] + c.array[2];
Note how we have ivtmp's still there which is wrong.
I am using Daniel Berlin's patch to find these.
--
Summary: invariant/constant not recomputed when ADDR_EXPR changed
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Keywords: missed-optimization, TREE
Severity: normal
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=18755
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/18755] invariant/constant not recomputed when ADDR_EXPR changed
2004-12-01 14:42 [Bug tree-optimization/18755] New: invariant/constant not recomputed when ADDR_EXPR changed pinskia at gcc dot gnu dot org
@ 2004-12-06 5:01 ` pinskia at gcc dot gnu dot org
2005-01-12 1:14 ` pinskia at gcc dot gnu dot org
2005-05-07 21:00 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-12-06 5:01 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-06 05:01 -------
Confirmed.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2004-12-06 05:01:01
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18755
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/18755] invariant/constant not recomputed when ADDR_EXPR changed
2004-12-01 14:42 [Bug tree-optimization/18755] New: invariant/constant not recomputed when ADDR_EXPR changed pinskia at gcc dot gnu dot org
2004-12-06 5:01 ` [Bug tree-optimization/18755] " pinskia at gcc dot gnu dot org
@ 2005-01-12 1:14 ` pinskia at gcc dot gnu dot org
2005-05-07 21:00 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-01-12 1:14 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-12 01:14 -------
The patch is here: <http://gcc.gnu.org/ml/gcc/2004-09/msg00772.html> by the way to find the
places.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18755
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/18755] invariant/constant not recomputed when ADDR_EXPR changed
2004-12-01 14:42 [Bug tree-optimization/18755] New: invariant/constant not recomputed when ADDR_EXPR changed pinskia at gcc dot gnu dot org
2004-12-06 5:01 ` [Bug tree-optimization/18755] " pinskia at gcc dot gnu dot org
2005-01-12 1:14 ` pinskia at gcc dot gnu dot org
@ 2005-05-07 21:00 ` pinskia at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-05-07 21:00 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-05-07 21:00 -------
This has now been fixed.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.1.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18755
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-05-07 21:00 UTC | newest]
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2004-12-01 14:42 [Bug tree-optimization/18755] New: invariant/constant not recomputed when ADDR_EXPR changed pinskia at gcc dot gnu dot org
2004-12-06 5:01 ` [Bug tree-optimization/18755] " pinskia at gcc dot gnu dot org
2005-01-12 1:14 ` pinskia at gcc dot gnu dot org
2005-05-07 21:00 ` pinskia at gcc dot gnu dot org
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