This is like PR 19580 but a request to optimize it on the tree level instead of
just on the RTL level.
Mainly because we don't catch it for PPC (with 3.3.3 or with -fno-gcse).
int r[6];
void f (int n)
{
while (-- n)
{
r [0] += r [5];
r [1] += r [0];
r [2] += r [1];
r [3] += r [2];
r [4] += r [3];
r [5] += r [4];
}
}
We should be able to pull out the load and stores for r[0] ... r[5].
If we do it on the tree level, we also just fix the problem for 4.0 also (but I
think this might need more
aliasing analysis or I could be wrong).
--
Summary: Missed store monition on the tree level (on PPC in
general)
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Keywords: missed-optimization, alias, TREE
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=19581
