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8086053: Address inconsistencies regarding ZeroTLAB

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Add zero-initialization to C1 for fast TLAB refills; strenghten C2 conditions for skipping zero-initialization.

Reviewed-by: kvn, thartmann
This commit is contained in:
Zoltan Majo 2016-01-12 09:19:09 +01:00
parent 5be1924e89
commit dfa6539a6a
18 changed files with 215 additions and 128 deletions
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8
hotspot/src/cpu/x86/vm/c1_Runtime1_x86.cpp
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@ -1040,7 +1040,7 @@ OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
__ tlab_allocate(obj, obj_size, 0, t1, t2, slow_path);
__ initialize_object(obj, klass, obj_size, 0, t1, t2);
__ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ true);
__ verify_oop(obj);
__ pop(rbx);
__ pop(rdi);
@ -1053,7 +1053,7 @@ OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
__ eden_allocate(obj, obj_size, 0, t1, slow_path);
__ incr_allocated_bytes(thread, obj_size, 0);
__ initialize_object(obj, klass, obj_size, 0, t1, t2);
__ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ false);
__ verify_oop(obj);
__ pop(rbx);
__ pop(rdi);
@ -1169,7 +1169,9 @@ OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
__ andptr(t1, Klass::_lh_header_size_mask);
__ subptr(arr_size, t1); // body length
__ addptr(t1, obj); // body start
__ initialize_body(t1, arr_size, 0, t2);
if (!ZeroTLAB) {
__ initialize_body(t1, arr_size, 0, t2);
}
__ verify_oop(obj);
__ ret(0);