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6791178: Specialize for zero as the compressed oop vm heap base

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Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.

Reviewed-by: never, twisti, jcoomes, coleenp
This commit is contained in:
Vladimir Kozlov 2009-03-12 10:37:46 -07:00
parent 66cecec230
commit 69f9ddee90
45 changed files with 1072 additions and 220 deletions
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4
hotspot/src/share/vm/opto/compile.cpp
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@ -2081,7 +2081,7 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &fpu ) {
#ifdef _LP64
case Op_CastPP:
if (n->in(1)->is_DecodeN() && UseImplicitNullCheckForNarrowOop) {
if (n->in(1)->is_DecodeN() && Universe::narrow_oop_use_implicit_null_checks()) {
Compile* C = Compile::current();
Node* in1 = n->in(1);
const Type* t = n->bottom_type();
@ -2136,7 +2136,7 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &fpu ) {
new_in2 = in2->in(1);
} else if (in2->Opcode() == Op_ConP) {
const Type* t = in2->bottom_type();
if (t == TypePtr::NULL_PTR && UseImplicitNullCheckForNarrowOop) {
if (t == TypePtr::NULL_PTR && Universe::narrow_oop_use_implicit_null_checks()) {
new_in2 = ConNode::make(C, TypeNarrowOop::NULL_PTR);
//
// This transformation together with CastPP transformation above