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8139758: [REDO] Elide more final field's write memory barrier with escape analysis result

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Membar for all final field initializations eliminated if possible

Reviewed-by: roland, vlivanov
This commit is contained in:
Hui Shi 2015-11-16 16:14:15 +01:00
parent a59fb9d9c1
commit 854b8d1ff1
3 changed files with 98 additions and 7 deletions
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9
hotspot/src/share/vm/opto/parse1.cpp
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@ -964,11 +964,12 @@ void Parse::do_exits() {
}
}
// Any method can write a @Stable field; insert memory barriers after
// those also. If there is a predecessor allocation node, bind the
// barrier there.
// Any method can write a @Stable field; insert memory barriers
// after those also. Can't bind predecessor allocation node (if any)
// with barrier because allocation doesn't always dominate
// MemBarRelease.
if (wrote_stable()) {
_exits.insert_mem_bar(Op_MemBarRelease, alloc_with_final());
_exits.insert_mem_bar(Op_MemBarRelease);
if (PrintOpto && (Verbose || WizardMode)) {
method()->print_name();
tty->print_cr(" writes @Stable and needs a memory barrier");