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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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45
hotspot/src/cpu/sparc/vm/assembler_sparc.cpp
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@ -4316,7 +4316,13 @@ void MacroAssembler::store_heap_oop(Register d, const Address& a, int offset) {
void MacroAssembler::encode_heap_oop(Register src, Register dst) {
assert (UseCompressedOops, "must be compressed");
assert (Universe::heap() != NULL, "java heap should be initialized");
assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
verify_oop(src);
if (Universe::narrow_oop_base() == NULL) {
srlx(src, LogMinObjAlignmentInBytes, dst);
return;
}
Label done;
if (src == dst) {
// optimize for frequent case src == dst
@ -4338,26 +4344,39 @@ void MacroAssembler::encode_heap_oop(Register src, Register dst) {
void MacroAssembler::encode_heap_oop_not_null(Register r) {
assert (UseCompressedOops, "must be compressed");
assert (Universe::heap() != NULL, "java heap should be initialized");
assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
verify_oop(r);
sub(r, G6_heapbase, r);
if (Universe::narrow_oop_base() != NULL)
sub(r, G6_heapbase, r);
srlx(r, LogMinObjAlignmentInBytes, r);
}
void MacroAssembler::encode_heap_oop_not_null(Register src, Register dst) {
assert (UseCompressedOops, "must be compressed");
assert (Universe::heap() != NULL, "java heap should be initialized");
assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
verify_oop(src);
sub(src, G6_heapbase, dst);
srlx(dst, LogMinObjAlignmentInBytes, dst);
if (Universe::narrow_oop_base() == NULL) {
srlx(src, LogMinObjAlignmentInBytes, dst);
} else {
sub(src, G6_heapbase, dst);
srlx(dst, LogMinObjAlignmentInBytes, dst);
}
}
// Same algorithm as oops.inline.hpp decode_heap_oop.
void MacroAssembler::decode_heap_oop(Register src, Register dst) {
assert (UseCompressedOops, "must be compressed");
Label done;
assert (Universe::heap() != NULL, "java heap should be initialized");
assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
sllx(src, LogMinObjAlignmentInBytes, dst);
bpr(rc_nz, true, Assembler::pt, dst, done);
delayed() -> add(dst, G6_heapbase, dst); // annuled if not taken
bind(done);
if (Universe::narrow_oop_base() != NULL) {
Label done;
bpr(rc_nz, true, Assembler::pt, dst, done);
delayed() -> add(dst, G6_heapbase, dst); // annuled if not taken
bind(done);
}
verify_oop(dst);
}
@ -4366,8 +4385,11 @@ void MacroAssembler::decode_heap_oop_not_null(Register r) {
// pd_code_size_limit.
// Also do not verify_oop as this is called by verify_oop.
assert (UseCompressedOops, "must be compressed");
assert (Universe::heap() != NULL, "java heap should be initialized");
assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
sllx(r, LogMinObjAlignmentInBytes, r);
add(r, G6_heapbase, r);
if (Universe::narrow_oop_base() != NULL)
add(r, G6_heapbase, r);
}
void MacroAssembler::decode_heap_oop_not_null(Register src, Register dst) {
@ -4375,14 +4397,17 @@ void MacroAssembler::decode_heap_oop_not_null(Register src, Register dst) {
// pd_code_size_limit.
// Also do not verify_oop as this is called by verify_oop.
assert (UseCompressedOops, "must be compressed");
assert (Universe::heap() != NULL, "java heap should be initialized");
assert (LogMinObjAlignmentInBytes == Universe::narrow_oop_shift(), "decode alg wrong");
sllx(src, LogMinObjAlignmentInBytes, dst);
add(dst, G6_heapbase, dst);
if (Universe::narrow_oop_base() != NULL)
add(dst, G6_heapbase, dst);
}
void MacroAssembler::reinit_heapbase() {
if (UseCompressedOops) {
// call indirectly to solve generation ordering problem
Address base(G6_heapbase, (address)Universe::heap_base_addr());
Address base(G6_heapbase, (address)Universe::narrow_oop_base_addr());
load_ptr_contents(base, G6_heapbase);
}
}