[PATCH] D42262: [JumpThreading] Don't restrict cast-traversal to i1

[Keno Fischer via Phabricator via llvm-commits]

loladiro added a comment.

This happens fairly frequently for us in julia, because we use i8 to represent tags for tagged unions and then switch on them to discover which of the union components is active.
Without this patch I saw ~3x performance regressions in the worst benchmark (because it prevented other optimizations from seeing optimization opportunities based on the
active union component). I did not see compilation performance impact in my testing.


Repository:
  rL LLVM

https://reviews.llvm.org/D42262