tree 8a4fedbc13402ae7c6a4ee34346cf26f53df4195
parent 2b6b0e00d9e55d10f85ab60e42d1f5a42eaef12f
author Aart Bik <ajcbik@google.com> 1558463346 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1558463346 +0000

[dart/vm] Peephole optimizer (window size one) on stack code

Rationale:
A basic peephole optimizer with window size one that avoids
redundant push-pop sequences already results is substantial
savings in code size and runtime, without any noticeable impact
on compile time (the peephole is very, very fast).

Performance:
Golem unoptimized code (which typically runs -90% compared to
optimized code, sees 5-60% improvements

https://github.com/dart-lang/sdk/issues/36409

Change-Id: I08db4b3dbc92377d89340a4969db6e664e54bceb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/102980
Commit-Queue: Aart Bik <ajcbik@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>