[PATCH] D48555: Account for undef values from predecessors in extendSegmentsToUses

[David Stuttard via Phabricator via llvm-commits]

dstuttard accepted this revision.
dstuttard added a comment.
This revision is now accepted and ready to land.

Yes, this change looks better based on what you say about not requiring live-in's for undef sub-ranges.

Regarding cutting down the .mir test case. Presumably you're happy with the version you've copied across to this change (removing the unnecessary register classes)? I've already spent quite a lot of time reducing the test case as much as this - the problem is that it requires spilling to trigger the issue. Using -stress-regalloc worked to some extent, but couldn't be reduced further in this case - hence some of the extra code that doesn't directly impinge on the problem.


Repository:
  rL LLVM

https://reviews.llvm.org/D48555