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8161720: Better byte behavior for off-heap data

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Normalize boolean values read with Unsafe.

Reviewed-by: aph, simonis, jrose, psandoz
This commit is contained in:
Zoltan Majo 2016-08-30 09:30:16 +02:00
parent 7a6ffc8b52
commit 00c9b389f6
6 changed files with 319 additions and 7 deletions
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9
hotspot/src/share/vm/c1/c1_LIRGenerator.cpp
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@ -2410,6 +2410,15 @@ void LIRGenerator::do_UnsafeGetObject(UnsafeGetObject* x) {
#endif // INCLUDE_ALL_GCS
if (x->is_volatile() && os::is_MP()) __ membar_acquire();
/* Normalize boolean value returned by unsafe operation, i.e., value != 0 ? value = true : value false. */
if (type == T_BOOLEAN) {
LabelObj* equalZeroLabel = new LabelObj();
__ cmp(lir_cond_equal, value, 0);
__ branch(lir_cond_equal, T_BOOLEAN, equalZeroLabel->label());
__ move(LIR_OprFact::intConst(1), value);
__ branch_destination(equalZeroLabel->label());
}
}