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This commit is contained in:
Vladimir Kozlov 2016-08-01 22:34:23 -07:00
commit 7ffefd9bf6
1 changed files with 34 additions and 12 deletions
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46
hotspot/src/share/vm/opto/cfgnode.cpp
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@ -1703,29 +1703,51 @@ Node *PhiNode::Ideal(PhaseGVN *phase, bool can_reshape) {
}
if (uncasted) {
// Add a cast node between the phi to be removed and its unique input.
// Add cast nodes between the phi to be removed and its unique input.
// Wait until after parsing for the type information to propagate from the casts.
assert(can_reshape, "Invalid during parsing");
const Type* phi_type = bottom_type();
assert(phi_type->isa_int() || phi_type->isa_ptr(), "bad phi type");
int opcode;
// Determine the type of cast to be added.
// Add casts to carry the control dependency of the Phi that is
// going away
Node* cast = NULL;
if (phi_type->isa_int()) {
opcode = Op_CastII;
cast = ConstraintCastNode::make_cast(Op_CastII, r, uin, phi_type, true);
} else {
const Type* uin_type = phase->type(uin);
if ((phi_type->join(TypePtr::NOTNULL) == uin_type->join(TypePtr::NOTNULL)) ||
(!phi_type->isa_oopptr() && !uin_type->isa_oopptr())) {
opcode = Op_CastPP;
if (!phi_type->isa_oopptr() && !uin_type->isa_oopptr()) {
cast = ConstraintCastNode::make_cast(Op_CastPP, r, uin, phi_type, true);
} else {
opcode = Op_CheckCastPP;
// Use a CastPP for a cast to not null and a CheckCastPP for
// a cast to a new klass (and both if both null-ness and
// klass change).
// If the type of phi is not null but the type of uin may be
// null, uin's type must be casted to not null
if (phi_type->join(TypePtr::NOTNULL) == phi_type->remove_speculative() &&
uin_type->join(TypePtr::NOTNULL) != uin_type->remove_speculative()) {
cast = ConstraintCastNode::make_cast(Op_CastPP, r, uin, TypePtr::NOTNULL, true);
}
// If the type of phi and uin, both casted to not null,
// differ the klass of uin must be (check)cast'ed to match
// that of phi
if (phi_type->join_speculative(TypePtr::NOTNULL) != uin_type->join_speculative(TypePtr::NOTNULL)) {
Node* n = uin;
if (cast != NULL) {
cast = phase->transform(cast);
n = cast;
}
cast = ConstraintCastNode::make_cast(Op_CheckCastPP, r, n, phi_type, true);
}
if (cast == NULL) {
cast = ConstraintCastNode::make_cast(Op_CastPP, r, uin, phi_type, true);
}
}
}
// Add a cast to carry the control dependency of the Phi that is
// going away
Node* cast = ConstraintCastNode::make_cast(opcode, r, uin, phi_type, true);
assert(cast != NULL, "cast should be set");
cast = phase->transform(cast);
// set all inputs to the new cast so the Phi is removed by Identity
// set all inputs to the new cast(s) so the Phi is removed by Identity
PhaseIterGVN* igvn = phase->is_IterGVN();
for (uint i = 1; i < req(); i++) {
set_req_X(i, cast, igvn);