[all-commits] [llvm/llvm-project] 0eddee: [ValueTracking] Improve isKnownNonNaN() to recogn...

[Jonas Paulsson via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 0eddeeab29a1cce8f9169b270c9fdd484534d91b
      https://github.com/llvm/llvm-project/commit/0eddeeab29a1cce8f9169b270c9fdd484534d91b
  Author: Jonas Paulsson <paulsson at linux.vnet.ibm.com>
  Date:   2020-02-19 (Wed, 19 Feb 2020)

  Changed paths:
    M llvm/lib/Analysis/ValueTracking.cpp
    A llvm/test/CodeGen/SystemZ/vec-max-min-zerosplat.ll

  Log Message:
  -----------
  [ValueTracking]  Improve isKnownNonNaN() to recognize zero splats.

isKnownNonNaN() could not recognize a zero splat because that is a
ConstantAggregateZero which is-a ConstantData but not a ConstantDataVector.

Patch makes a ConstantAggregateZero return true.

Review: Thomas Lively

Differential Revision: https://reviews.llvm.org/D74263