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7184649: NPG: Implement another MetdataPtr case

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Xmeet when both inputs are MetadataPtr.

Reviewed-by: kvn
This commit is contained in:
Roland Westrelin 2012-09-04 23:27:55 +02:00
parent 3610a76e25
commit badaff577b
1 changed files with 18 additions and 3 deletions
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21
hotspot/src/share/vm/opto/type.cpp
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@ -3913,10 +3913,25 @@ const Type *TypeMetadataPtr::xmeet( const Type *t ) const {
case AryPtr:
return TypePtr::BOTTOM; // Oop meet raw is not well defined
case MetadataPtr:
ShouldNotReachHere();
case MetadataPtr: {
const TypeMetadataPtr *tp = t->is_metadataptr();
int offset = meet_offset(tp->offset());
PTR tptr = tp->ptr();
PTR ptr = meet_ptr(tptr);
ciMetadata* md = (tptr == TopPTR) ? metadata() : tp->metadata();
if (tptr == TopPTR || _ptr == TopPTR ||
metadata()->equals(tp->metadata())) {
return make(ptr, md, offset);
}
// metadata is different
if( ptr == Constant ) { // Cannot be equal constants, so...
if( tptr == Constant && _ptr != Constant) return t;
if( _ptr == Constant && tptr != Constant) return this;
ptr = NotNull; // Fall down in lattice
}
return make(ptr, NULL, offset);
break;
}
} // End of switch
return this; // Return the double constant
}