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5091921: Sign flip issues in loop optimizer

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Fix integer overflow problem in the code generated by loop optimizer.

Reviewed-by: never
This commit is contained in:
Vladimir Kozlov 2011-05-04 13:12:42 -07:00
parent 1e12174562
commit 1ac79543d0
40 changed files with 4195 additions and 214 deletions
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9
hotspot/src/share/vm/opto/ifnode.cpp
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@ -236,6 +236,7 @@ static Node* split_if(IfNode *iff, PhaseIterGVN *igvn) {
}
Node* predicate_c = NULL;
Node* predicate_x = NULL;
bool counted_loop = r->is_CountedLoop();
Node *region_c = new (igvn->C, req_c + 1) RegionNode(req_c + 1);
Node *phi_c = con1;
@ -294,16 +295,16 @@ static Node* split_if(IfNode *iff, PhaseIterGVN *igvn) {
if (predicate_c != NULL) {
assert(predicate_x == NULL, "only one predicate entry expected");
// Clone loop predicates to each path
iff_c_t = igvn->clone_loop_predicates(predicate_c, iff_c_t);
iff_c_f = igvn->clone_loop_predicates(predicate_c, iff_c_f);
iff_c_t = igvn->clone_loop_predicates(predicate_c, iff_c_t, !counted_loop);
iff_c_f = igvn->clone_loop_predicates(predicate_c, iff_c_f, !counted_loop);
}
Node *iff_x_t = phase->transform(new (igvn->C, 1) IfTrueNode (iff_x));
Node *iff_x_f = phase->transform(new (igvn->C, 1) IfFalseNode(iff_x));
if (predicate_x != NULL) {
assert(predicate_c == NULL, "only one predicate entry expected");
// Clone loop predicates to each path
iff_x_t = igvn->clone_loop_predicates(predicate_x, iff_x_t);
iff_x_f = igvn->clone_loop_predicates(predicate_x, iff_x_f);
iff_x_t = igvn->clone_loop_predicates(predicate_x, iff_x_t, !counted_loop);
iff_x_f = igvn->clone_loop_predicates(predicate_x, iff_x_f, !counted_loop);
}
// Merge the TRUE paths