Samir Jindel eff1a9ff97 Re-land "[vm] Aggressive write-barrier elimination."
The original revision is in Patchset 3.

Four bugs were fixed:

1. JoinEntryInstr::SuccessorCount() is not the correct way to get the
   number of successor blocks from the Join block;
   JoinEntryInstr::last_instruction()->SuccessorCount() must be used
   instead.

2. BitVector::Equals() was non-deterministically returning 'false'
   for equal vectors.

3. All blocks need to be processed at least once during the Analysis
   phase (not only in the SaveResults phase).

4. We were not removing write barriers from StoreIndexed instructions,
   even though we had support for it.

This reverts commit 7fd8ad5a2d.

Fixes https://github.com/dart-lang/sdk/issues/40780

Change-Id: I9650ec2c547ec49cf88ca0524e14f6c245621f6a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/138086
Commit-Queue: Samir Jindel <sjindel@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
2020-03-09 14:37:27 +00:00
2019-04-30 18:14:21 +00:00
2020-02-21 12:45:19 +00:00
2020-03-09 14:17:07 +00:00
2019-08-05 20:34:31 +00:00
2020-03-06 21:33:53 +00:00
2020-03-09 07:29:00 +00:00
2020-01-22 18:46:23 +00:00
2019-08-05 20:34:31 +00:00
2020-03-06 19:57:13 +00:00
2019-08-16 12:03:17 +00:00
2020-01-20 09:32:58 +00:00
2020-02-21 12:45:19 +00:00

Dart

A client-optimized language for fast apps on any platform

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