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6703890: Compressed Oops: add LoadNKlass node to generate narrow oops (32-bits) compare instructions

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Add LoadNKlass and CMoveN nodes, use CmpN and ConN nodes to generate narrow oops compare instructions.

Reviewed-by: never, rasbold
This commit is contained in:
Vladimir Kozlov 2008-05-21 13:46:23 -07:00
parent 757229db71
commit 76035424de
29 changed files with 428 additions and 128 deletions
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33
hotspot/src/share/vm/opto/compile.cpp
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@ -1968,6 +1968,7 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &fpu ) {
case Op_LoadC:
case Op_LoadI:
case Op_LoadKlass:
case Op_LoadNKlass:
case Op_LoadL:
case Op_LoadL_unaligned:
case Op_LoadPLocked:
@ -1998,6 +1999,38 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &fpu ) {
break;
}
#ifdef _LP64
case Op_CmpP:
if( n->in(1)->Opcode() == Op_DecodeN ) {
Compile* C = Compile::current();
Node* in2 = NULL;
if( n->in(2)->Opcode() == Op_DecodeN ) {
in2 = n->in(2)->in(1);
} else if ( n->in(2)->Opcode() == Op_ConP ) {
const Type* t = n->in(2)->bottom_type();
if (t == TypePtr::NULL_PTR) {
Node *in1 = n->in(1);
uint i = 0;
for (; i < in1->outcnt(); i++) {
if (in1->raw_out(i)->is_AddP())
break;
}
if (i >= in1->outcnt()) {
// Don't replace CmpP(o ,null) if 'o' is used in AddP
// to generate implicit NULL check.
in2 = ConNode::make(C, TypeNarrowOop::NULL_PTR);
}
} else if (t->isa_oopptr()) {
in2 = ConNode::make(C, t->is_oopptr()->make_narrowoop());
}
}
if( in2 != NULL ) {
Node* cmpN = new (C, 3) CmpNNode(n->in(1)->in(1), in2);
n->replace_by( cmpN );
}
}
#endif
case Op_ModI:
if (UseDivMod) {
// Check if a%b and a/b both exist