Alexander Markov b7c3c32f63 [vm] Do not assign type to phi if it was loaded from a different local ...

During SSA construction in strong mode, types of local variables are
propagated (assigned) to phis which are 'loaded' from slots corresponding
to those local variables.

It is incorrect if phi was stored in a different local variable with a more
specific type and then reloaded.

After this change, type is propagated from local variable to phis only if
phi was created for this local.

Fixes https://github.com/dart-lang/sdk/issues/32597

Change-Id: I7d86c2ef79d14895c9b4c3651d0234b3f9c66173
Reviewed-on: https://dart-review.googlesource.com/47200
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>

2018-03-20 23:08:49 +00:00

..

vm

[vm] Do not assign type to phi if it was loaded from a different local

2018-03-20 23:08:49 +00:00