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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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2
hotspot/src/share/vm/opto/macroArrayCopy.cpp
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@ -295,7 +295,7 @@ Node* PhaseMacroExpand::generate_arraycopy(ArrayCopyNode *ac, AllocateArrayNode*
// out-edges of the dest, we need to avoid making derived pointers
// from it until we have checked its uses.)
if (ReduceBulkZeroing
&& !ZeroTLAB // pointless if already zeroed
&& !(UseTLAB && ZeroTLAB) // pointless if already zeroed
&& basic_elem_type != T_CONFLICT // avoid corner case
&& !src->eqv_uncast(dest)
&& alloc != NULL