tree 0756def261ef6015ff7b79e354c6e292bbbc3178
parent bdeefc380ae85b526c0b0a992906edd91a904080
author Samir Jindel <sjindel@google.com> 1548160968 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1548160968 +0000

[vm] Improve SelectRepresentations.

It's no longer necessary to prove that a phi will fit into 64 bits to unbox it,
because all ints in Dart 2 are 64-bit.

Also, we add a new heuristic to always unbox a phi if all inputs are unboxed.

This improves MD5 performance on ARM32 AOT by 27%, matching existing JIT performance.

Change-Id: I9ebbfc3bb8d565e746d3740528fdf7ee32c0f7a4
Cq-Include-Trybots: luci.dart.try:vm-kernel-optcounter-threshold-linux-release-x64-try, vm-kernel-precomp-linux-debug-x64-try, vm-kernel-precomp-linux-release-simarm-try, vm-kernel-precomp-linux-release-simarm64-try, vm-kernel-precomp-linux-release-x64-try, vm-kernel-precomp-mac-release-simarm64-try, vm-kernel-precomp-win-release-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/88841
Commit-Queue: Samir Jindel <sjindel@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>