Replacing putIfAbsent with containsKey (and inserting if not) gives an
improvement.
When compiling dart2js with fasta (from source), measuring only calls
to `recordUse` (which is called 1,549,231 times) (but measured
'outside' the method itself to include the `AllocateContext` cost)
I get the following:
Difference at 95.0% confidence
-37.2 +/- 18.2218
-18.5814% +/- 9.10179%
(Student's t, pooled s = 12.494)
i.e. almost 40 ms faster.
(this should be seen in a context of the entire compile taking
10+ seconds, but still).
Change-Id: I96cf521bb3cf760f14e4a407ff24638f019a8e21
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/194760
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Jens Johansen
97742f827a