[PATCH] D49229: [AggressiveInstCombine] Fold redundant masking operations of shifted value

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

In D49229#1562329 <https://reviews.llvm.org/D49229#1562329>, @dnsampaio wrote:

> Hi @lebedev.ri,
>  Nice you looked this one as I am not quite sure what to do about it. Any suggestions?


As it can be seen from the disscussion here, while the problem this is trying to solve is real,
the actual solution that should be done is very much non-obvious. It kind-of doesn't anywhere.
Or maybe there's some astounding perf numbers (SPEC?) that justify **this** solution?
I don't have any further ideas presently, sorry. I only marked it to remove from review queue.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D49229/new/

https://reviews.llvm.org/D49229