[PATCH] D21189: Create subranges for new intervals resulting from live interval splitting

[Matthias Braun via llvm-commits]

MatzeB added a comment.

In http://reviews.llvm.org/D21189#465028, @kparzysz wrote:

> A read-undef flag on a def of sub0 does not have any implications about the liveness of sub1.  Otherwise, a sub0<def,read-undef> would need to be reflected in the live range of sub1, or else you wouldn't be able to extend it to its uses.


No no no: On a def for sub0 the read-undef flag is exactly about the liveness of the other subregs like sub1


Repository:
  rL LLVM

http://reviews.llvm.org/D21189