[PATCH] D141344: Remove a FIXME that will never be fixed since undef is being removed.

[Owen Anderson via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG1e0f814e7309: Remove a FIXME that will never be fixed since undef is being removed. (authored by resistor).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D141344/new/

https://reviews.llvm.org/D141344

Files:
  llvm/lib/Transforms/Scalar/BDCE.cpp


Index: llvm/lib/Transforms/Scalar/BDCE.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/BDCE.cpp
+++ llvm/lib/Transforms/Scalar/BDCE.cpp
@@ -143,9 +143,8 @@
 
       clearAssumptionsOfUsers(&I, DB);
 
-      // FIXME: In theory we could substitute undef here instead of zero.
-      // This should be reconsidered once we settle on the semantics of
-      // undef, poison, etc.
+      // Substitute all uses with zero. In theory we could use `freeze poison`
+      // instead, but that seems unlikely to be profitable.
       U.set(ConstantInt::get(U->getType(), 0));
       ++NumSimplified;
       Changed = true;


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