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7008866: Missing loop predicate for loop with multiple entries

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Add predicates when loop head bytecode is parsed instead of when back branch bytecode is parsed.

Reviewed-by: never
This commit is contained in:
Vladimir Kozlov 2011-03-21 11:28:14 -07:00
parent a3e259c335
commit 3de260da41
15 changed files with 703 additions and 480 deletions
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7
hotspot/src/share/vm/opto/stringopts.cpp
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@ -969,6 +969,10 @@ Node* PhaseStringOpts::int_stringSize(GraphKit& kit, Node* arg) {
// for (int i=0; ; i++)
// if (x <= sizeTable[i])
// return i+1;
// Add loop predicate first.
kit.add_predicate();
RegionNode *loop = new (C, 3) RegionNode(3);
loop->init_req(1, kit.control());
kit.gvn().set_type(loop, Type::CONTROL);
@ -1086,6 +1090,9 @@ void PhaseStringOpts::int_getChars(GraphKit& kit, Node* arg, Node* char_array, N
// }
{
// Add loop predicate first.
kit.add_predicate();
RegionNode *head = new (C, 3) RegionNode(3);
head->init_req(1, kit.control());
kit.gvn().set_type(head, Type::CONTROL);