RFR: 8222484: Specialize generation of simple String concatenation expressions

Claes Redestad claes.redestad at oracle.com
Mon Apr 15 14:14:26 UTC 2019

On 2019-04-15 15:10, Claes Redestad wrote:
> This reduces first-time bootstrap times for the targeted patterns from
> ~20ms to be lost in the noise on my machine (so ~0.5ms), while being
> peak performance neutral and not regressing bootstrap characteristics on
> more complex patterns.

Correction: I accidentally had some tuning flags applied to one set of
runs but not the other. In a more fair apple-to-apples re-run the first-
time bootstrap cost drops from ~30ms to ~9ms. The 20ms drop was correct
in absolute terms, but there's still a measurable cost overhead of
initializing SCF itself (this RFE helps amortize those costs in many


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