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6667612: (Escape Analysis) disable loop cloning if it has a scalar replaceable allocation

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Cloning an allocation will not allow scalar replacement since memory operations could not be associated with one allocation.

Reviewed-by: rasbold
This commit is contained in:
Vladimir Kozlov 2008-03-06 10:53:33 -08:00
parent bf7f5e1887
commit 277c3322f6
6 changed files with 20 additions and 3 deletions
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10
hotspot/src/share/vm/opto/loopnode.cpp
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@ -1561,7 +1561,7 @@ PhaseIdealLoop::PhaseIdealLoop( PhaseIterGVN &igvn, const PhaseIdealLoop *verify
// on just their loop-phi's for this pass of loop opts
if( SplitIfBlocks && do_split_ifs ) {
if (lpt->policy_range_check(this)) {
lpt->_rce_candidate = true;
lpt->_rce_candidate = 1; // = true
}
}
}
@ -2145,7 +2145,7 @@ int PhaseIdealLoop::build_loop_tree_impl( Node *n, int pre_order ) {
// as well? If so, then I found another entry into the loop.
while( is_postvisited(l->_head) ) {
// found irreducible
l->_irreducible = true;
l->_irreducible = 1; // = true
l = l->_parent;
_has_irreducible_loops = true;
// Check for bad CFG here to prevent crash, and bailout of compile
@ -2199,6 +2199,12 @@ int PhaseIdealLoop::build_loop_tree_impl( Node *n, int pre_order ) {
(iff->as_If()->_prob >= 0.01) )
innermost->_has_call = 1;
}
} else if( n->is_Allocate() && n->as_Allocate()->_is_scalar_replaceable ) {
// Disable loop optimizations if the loop has a scalar replaceable
// allocation. This disabling may cause a potential performance lost
// if the allocation is not eliminated for some reason.
innermost->_allow_optimizations = false;
innermost->_has_call = 1; // = true
}
}
}