[PATCH] D44617: [Transforms] Keep TBAA tags in SimplifyCFG transformations

Danil Malyshev via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Sun Mar 18 18:12:32 PDT 2018

DanilM created this revision.
DanilM added reviewers: hfinkel, rjmccall, kosarev.
Herald added a subscriber: cfe-commits.

If SimplifyCFG attaches one block to another it removes all metadata from instructions of a block that should be attached because it can be depended on conditions that are changed during transformation.
In case of TBAA metadata, it looks too conservatively: data types of load/store instructions cannot be changed during such transformations even if the pointed data was changed.
So attached the patch saves TBAA tags from removing during SimplifyCFG transformations.

  rC Clang



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