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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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16
hotspot/src/cpu/sparc/vm/macroAssembler_sparc.cpp
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@ -3459,11 +3459,27 @@ void MacroAssembler::tlab_refill(Label& retry, Label& try_eden, Label& slow_case
add(top, t1, top); // t1 is tlab_size
sub(top, ThreadLocalAllocBuffer::alignment_reserve_in_bytes(), top);
st_ptr(top, G2_thread, in_bytes(JavaThread::tlab_end_offset()));
if (ZeroTLAB) {
// This is a fast TLAB refill, therefore the GC is not notified of it.
// So compiled code must fill the new TLAB with zeroes.
ld_ptr(G2_thread, in_bytes(JavaThread::tlab_start_offset()), t2);
zero_memory(t2, t1);
}
verify_tlab();
ba(retry);
delayed()->nop();
}
void MacroAssembler::zero_memory(Register base, Register index) {
assert_different_registers(base, index);
Label loop;
bind(loop);
subcc(index, HeapWordSize, index);
brx(Assembler::greaterEqual, true, Assembler::pt, loop);
delayed()->st_ptr(G0, base, index);
}
void MacroAssembler::incr_allocated_bytes(RegisterOrConstant size_in_bytes,
Register t1, Register t2) {
// Bump total bytes allocated by this thread