Stanislav Mekhanoshin c8f78f8dd3 [AMDGPU] Add MachineDCE pass after RenameIndependentSubregs ...

Detect dead lanes can create some dead defs. Then RenameIndependentSubregs
will break a REG_SEQUENCE which may use these dead defs. At this point
a dead instruction can be removed but we do not run a DCE anymore.

MachineDCE was only running before live variable analysis. The patch
adds a mean to preserve LiveIntervals and SlotIndexes in case it works
past this.

Differential Revision: https://reviews.llvm.org/D59626

llvm-svn: 357805

2019-04-05 20:11:32 +00:00

7.2 KiB

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