Mercurial > hg > graal-jvmci-8
diff src/share/vm/opto/memnode.cpp @ 4115:1bd45abaa507
6890673: Eliminate allocations immediately after EA
Summary: Try to eliminate allocations and related locks immediately after escape analysis.
Reviewed-by: never
| author | kvn |
|---|---|
| date | Wed, 16 Nov 2011 09:13:57 -0800 |
| parents | 670a74b863fc |
| children | f745b2be3737 |
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--- a/src/share/vm/opto/memnode.cpp Wed Nov 16 01:39:50 2011 -0800 +++ b/src/share/vm/opto/memnode.cpp Wed Nov 16 09:13:57 2011 -0800 @@ -2661,6 +2661,8 @@ // control copies Node *StrIntrinsicNode::Ideal(PhaseGVN *phase, bool can_reshape) { if (remove_dead_region(phase, can_reshape)) return this; + // Don't bother trying to transform a dead node + if (in(0) && in(0)->is_top()) return NULL; if (can_reshape) { Node* mem = phase->transform(in(MemNode::Memory)); @@ -2675,6 +2677,12 @@ return NULL; } +//------------------------------Value------------------------------------------ +const Type *StrIntrinsicNode::Value( PhaseTransform *phase ) const { + if (in(0) && phase->type(in(0)) == Type::TOP) return Type::TOP; + return bottom_type(); +} + //============================================================================= MemBarNode::MemBarNode(Compile* C, int alias_idx, Node* precedent) : MultiNode(TypeFunc::Parms + (precedent == NULL? 0: 1)), @@ -2715,6 +2723,8 @@ // control copies Node *MemBarNode::Ideal(PhaseGVN *phase, bool can_reshape) { if (remove_dead_region(phase, can_reshape)) return this; + // Don't bother trying to transform a dead node + if (in(0) && in(0)->is_top()) return NULL; // Eliminate volatile MemBars for scalar replaced objects. if (can_reshape && req() == (Precedent+1) &&