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8153357: C2 creates incorrect cast after eliminating phi with unique input

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Refine C2's logic to determine the type of cast node added.

Reviewed-by: kvn
This commit is contained in:
Zoltan Majo 2016-04-18 11:22:51 +02:00
parent acab1fddac
commit c05dd2fdca
1 changed files with 5 additions and 2 deletions
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7
hotspot/src/share/vm/opto/cfgnode.cpp
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@ -1703,16 +1703,19 @@ Node *PhiNode::Ideal(PhaseGVN *phase, bool can_reshape) {
}
if (uncasted) {
// Wait until after parsing for the type information to propagate from the casts
// Add a cast node 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.
if (phi_type->isa_int()) {
opcode = Op_CastII;
} else {
const Type* uin_type = phase->type(uin);
if (phi_type->join(TypePtr::NOTNULL) == uin_type->join(TypePtr::NOTNULL)) {
if ((phi_type->join(TypePtr::NOTNULL) == uin_type->join(TypePtr::NOTNULL)) ||
(!phi_type->isa_oopptr() && !uin_type->isa_oopptr())) {
opcode = Op_CastPP;
} else {
opcode = Op_CheckCastPP;