[PATCH] D71657: [SDAG] Handle BUILD_PAIR in ComputeNumSignBits

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

In D71657#1795133 <https://reviews.llvm.org/D71657#1795133>, @RKSimon wrote:

> Your best bet is to drill down inside the build_pair to see if it comes from a common source, but it'll be very limited.


I believe in this case, the inputs to the build_pair are just two copyfromregs on liveins to the basic block. There's no where to drill down to.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D71657/new/

https://reviews.llvm.org/D71657