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# bed1c7f0 19-Dec-2022 Nikita Popov <npopov@redhat.com>

[ARM] Convert some tests to opaque pointers (NFC)


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# ca0abaeb 02-Feb-2018 Matthias Braun <matze@braunis.de>

SplitKit: Fix liveness recomputation in some remat cases.

Example situation:
```
BB0:
%0 = ...
use %0
; ...
condjump BB1
jmp BB2

BB1:
%0 = ... ; rematerialized def from above (from ea

SplitKit: Fix liveness recomputation in some remat cases.

Example situation:
```
BB0:
%0 = ...
use %0
; ...
condjump BB1
jmp BB2

BB1:
%0 = ... ; rematerialized def from above (from earlier split step)
jmp BB2

BB2:
; ...
use %0
```

%0 will have a live interval with 3 value numbers (for the BB0, BB1 and
BB2 parts). Now SplitKit tries and succeeds in rematerializing the value
number in BB2 (This only works because it is a secondary split so
SplitKit is can trace this back to a single original def).

We need to recompute all live ranges affected by a value number that we
rematerialize. The case that we missed before is that when the value
that is rematerialized is at a join (Phi VNI) then we also have to
recompute liveness for the predecessor VNIs.

rdar://35699130

Differential Revision: https://reviews.llvm.org/D42667

llvm-svn: 324039

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