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  1. JDK
  2. JDK-8220159

Optimize various RegMask operations by introducing watermarks

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    • b12

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      By introducing a low and high water mark of the RegMask words that we are sure have register bits, we can reduce time spent doing a variety of operations.

      On a few profiled startup application the average number of instructions spent compiling methods in C2 drops 10-15%, and we see improvements on a range of startup and footprint applications.

      There are also a few improvements on microbenchmarks, likely due to a positive effect on warmup times.

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