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8028471: PPC64 (part 215): opto: Extend ImplicitNullCheck optimization

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Fixed Implicit NULL check optimization for AIX, where the page at address '0' is only write-protected.

Reviewed-by: kvn
This commit is contained in:
Goetz Lindenmaier 2013-11-21 18:29:34 -08:00
parent aabed3781b
commit a7c123880e
11 changed files with 65 additions and 8 deletions
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2
hotspot/src/share/vm/opto/callGenerator.cpp
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@ -201,7 +201,7 @@ JVMState* VirtualCallGenerator::generate(JVMState* jvms, Parse* parent_parser) {
// Block::implicit_null_check() only looks for loads and stores, not calls.
ciMethod *caller = kit.method();
ciMethodData *caller_md = (caller == NULL) ? NULL : caller->method_data();
if (!UseInlineCaches || !ImplicitNullChecks ||
if (!UseInlineCaches || !ImplicitNullChecks || !os::zero_page_read_protected() ||
((ImplicitNullCheckThreshold > 0) && caller_md &&
(caller_md->trap_count(Deoptimization::Reason_null_check)
>= (uint)ImplicitNullCheckThreshold))) {