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6653795: C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems

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Native pointers less than 64 bits wide should be extended as an unsigned number.

Reviewed-by: kvn, kevinw
This commit is contained in:
Poonam Bajaj 2014-03-24 08:43:10 -07:00
parent 93c0cc2aa8
commit 1516f610a1
5 changed files with 83 additions and 1 deletions
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11
hotspot/src/share/vm/opto/graphKit.cpp
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@ -1125,6 +1125,17 @@ Node* GraphKit::ConvI2L(Node* offset) {
}
return _gvn.transform( new (C) ConvI2LNode(offset));
}
Node* GraphKit::ConvI2UL(Node* offset) {
juint offset_con = (juint) find_int_con(offset, Type::OffsetBot);
if (offset_con != (juint) Type::OffsetBot) {
return longcon((julong) offset_con);
}
Node* conv = _gvn.transform( new (C) ConvI2LNode(offset));
Node* mask = _gvn.transform( ConLNode::make(C, (julong) max_juint) );
return _gvn.transform( new (C) AndLNode(conv, mask) );
}
Node* GraphKit::ConvL2I(Node* offset) {
// short-circuit a common case
jlong offset_con = find_long_con(offset, (jlong)Type::OffsetBot);