review for 7071307: MethodHandle bimorphic inlining should consider the frequency
igor.veresov at oracle.com
Thu Jul 28 18:22:59 PDT 2011
On 7/28/11 4:47 PM, Tom Rodriguez wrote:
> 46 lines changed: 27 ins; 6 del; 13 mod; 3568 unchg
> 7071307: MethodHandle bimorphic inlining should consider the frequency
> The fix for 7050554 added a bimorphic inline path but didn't take into
> account the frequency of the guarding test. This ends up treating
> both sides of the if as equally frequent which can lead to over
> inlining and overflowing the method inlining limits. The fix is to
> grab the frequency from the If and apply that to the branches. This
> addresses a major source of overinlining that can result in bad
> performance with JSR 292. We may do a later extension to this to
> actually do per call chain profiling of selectAlternative but that's a
> more complicated fix.
> I also fixed a problem with the ideal graph printer where debug_orig
> printing would go into an infinite loop.
> Tested with jruby and vm.mlvm tests.
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