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# HG changeset patch
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# User roland
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# Date 1469615613 -7200
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# Wed Jul 27 12:33:33 2016 +0200
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# Node ID fd29eff8b797daa41a68394ced7fe80c9e8c96e9
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# Parent ee9bffb3bd390b2ad805c7b59d7d2ab8a68a4367
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8162384, PR3122: Performance regression: bimorphic inlining may be bypassed by type speculation
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Summary: when speculation fails at a call fallback to profile data at the call site
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Reviewed-by: kvn
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diff -r ee9bffb3bd39 -r fd29eff8b797 src/share/vm/opto/doCall.cpp
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--- openjdk/hotspot/src/share/vm/opto/doCall.cpp Mon Aug 01 16:33:54 2016 +0100
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+++ openjdk/hotspot/src/share/vm/opto/doCall.cpp Wed Jul 27 12:33:33 2016 +0200
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@@ -205,16 +205,22 @@
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int morphism = profile.morphism();
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if (speculative_receiver_type != NULL) {
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- // We have a speculative type, we should be able to resolve
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- // the call. We do that before looking at the profiling at
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- // this invoke because it may lead to bimorphic inlining which
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- // a speculative type should help us avoid.
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- receiver_method = callee->resolve_invoke(jvms->method()->holder(),
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- speculative_receiver_type);
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- if (receiver_method == NULL) {
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+ if (!too_many_traps(caller, bci, Deoptimization::Reason_speculate_class_check)) {
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+ // We have a speculative type, we should be able to resolve
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+ // the call. We do that before looking at the profiling at
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+ // this invoke because it may lead to bimorphic inlining which
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+ // a speculative type should help us avoid.
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+ receiver_method = callee->resolve_invoke(jvms->method()->holder(),
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+ speculative_receiver_type);
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+ if (receiver_method == NULL) {
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+ speculative_receiver_type = NULL;
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+ } else {
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+ morphism = 1;
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+ }
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+ } else {
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+ // speculation failed before. Use profiling at the call
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+ // (could allow bimorphic inlining for instance).
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speculative_receiver_type = NULL;
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- } else {
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- morphism = 1;
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}
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}
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if (receiver_method == NULL &&
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@@ -252,7 +258,7 @@
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Deoptimization::Reason_bimorphic :
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(speculative_receiver_type == NULL ? Deoptimization::Reason_class_check : Deoptimization::Reason_speculate_class_check);
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if ((morphism == 1 || (morphism == 2 && next_hit_cg != NULL)) &&
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- !too_many_traps(jvms->method(), jvms->bci(), reason)
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+ !too_many_traps(caller, bci, reason)
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) {
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// Generate uncommon trap for class check failure path
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// in case of monomorphic or bimorphic virtual call site.
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