Alexander Markov 69167e2bdb [vm/compiler] Recognize and propagate "value can be sentinel" property ...

This change adds can_be_sentinel() flag to CompileType and
prevents unboxing of phis which can be sentinel.
This flag means that set of values can potentially contain
Object::sentinel() which is used as a marker for the uninitialized
value of late variables.

TEST=runtime/tests/vm/dart/regress_46141_test.dart

Fixes https://github.com/dart-lang/sdk/issues/46141

Change-Id: I32f19488f54c6f69932584ecec3094e3b78cc0d0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/201600
Reviewed-by: Slava Egorov <vegorov@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>

2021-06-07 20:56:53 +00:00

..

concurrency

[VM/tests] issue/45618 - Avoid large outputs from tests

2021-05-26 06:04:01 +00:00

vm

[vm/compiler] Recognize and propagate "value can be sentinel" property

2021-06-07 20:56:53 +00:00