[PATCH] D45867: [InstCombine] Unfold masked merge with constant mask

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

In https://reviews.llvm.org/D45867#1082079, @xbolva00 wrote:

> Not related to this patch exactly but since you work in this area... maybe you can check this too?
>  https://godbolt.org/g/wksfqb


That particular example should be handled by dead code elimination pass i guess,
because it is literally optimized down to `return 0;`,
since it only reads global `uint32_t b;` once, and ultimately does nothing with that.

But, i have zero clues how it should be done.


Repository:
  rL LLVM

https://reviews.llvm.org/D45867