[Bug tree-optimization/19624] New: PRE pessimizes ivopts
rguenth at tat dot physik dot uni-tuebingen dot de
gcc-bugzilla@gcc.gnu.org
Tue Jan 25 14:45:00 GMT 2005
The attached testcase is pessimized by PRE. Be sure to get tree-level complete
loop unrolling enabled, f.i. with -O2 -funroll-loops with current mainline.
With PRE, a lot less computations are hoisted out of the inner loop. Note this
is not a regression to 3.4, which is not able to decompose Loc<Dim> appropriately
or avoid instantiating temporary objects of this type.
--
Summary: PRE pessimizes ivopts
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rguenth at tat dot physik dot uni-tuebingen dot de
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19624
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