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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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12
hotspot/src/share/vm/oops/oop.inline.hpp
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@ -148,10 +148,11 @@ inline bool oopDesc::is_null(narrowOop obj) { return obj == 0; }
inline narrowOop oopDesc::encode_heap_oop_not_null(oop v) {
assert(!is_null(v), "oop value can never be zero");
address heap_base = Universe::heap_base();
uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)heap_base, 1));
address base = Universe::narrow_oop_base();
int shift = Universe::narrow_oop_shift();
uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1));
assert(OopEncodingHeapMax > pd, "change encoding max if new encoding");
uint64_t result = pd >> LogMinObjAlignmentInBytes;
uint64_t result = pd >> shift;
assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow");
return (narrowOop)result;
}
@ -162,8 +163,9 @@ inline narrowOop oopDesc::encode_heap_oop(oop v) {
inline oop oopDesc::decode_heap_oop_not_null(narrowOop v) {
assert(!is_null(v), "narrow oop value can never be zero");
address heap_base = Universe::heap_base();
return (oop)(void*)((uintptr_t)heap_base + ((uintptr_t)v << LogMinObjAlignmentInBytes));
address base = Universe::narrow_oop_base();
int shift = Universe::narrow_oop_shift();
return (oop)(void*)((uintptr_t)base + ((uintptr_t)v << shift));
}
inline oop oopDesc::decode_heap_oop(narrowOop v) {