[all-commits] [llvm/llvm-project] a7ca9e: [Attributor] Fix callsite check in AAUndefinedBeha...

[Shinji Okumura via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: a7ca9e09bd10a989cf920df2fd70f562707c4776
      https://github.com/llvm/llvm-project/commit/a7ca9e09bd10a989cf920df2fd70f562707c4776
  Author: Shinji Okumura <okuraofvegetable at gmail.com>
  Date:   2020-08-30 (Sun, 30 Aug 2020)

  Changed paths:
    M llvm/lib/Transforms/IPO/AttributorAttributes.cpp
    M llvm/test/Transforms/Attributor/undefined_behavior.ll

  Log Message:
  -----------
  [Attributor] Fix callsite check in AAUndefinedBehavior

This is the next patch of D86842
When we check `noundef` attribute violation at callsites, we do not have to require `nonnull` in the following two cases.
1. An argument is known to be simplified to undef
2. An argument is known to be dead

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D86845