[all-commits] [llvm/llvm-project] 86dea1: [ValueTracking] Improve llvm.abs handling in compu...

[topperc via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 86dea1f39bd127776b999e10dff212003068d30a
      https://github.com/llvm/llvm-project/commit/86dea1f39bd127776b999e10dff212003068d30a
  Author: Craig Topper <craig.topper at intel.com>
  Date:   2020-07-31 (Fri, 31 Jul 2020)

  Changed paths:
    M llvm/lib/Analysis/ValueTracking.cpp
    M llvm/test/Transforms/InstCombine/abs-intrinsic.ll

  Log Message:
  -----------
  [ValueTracking] Improve llvm.abs handling in computeKnownBits.

Add the optimizations we have in the SelectionDAG version.
Known non-negative copies all known bits. Any known one other than
the sign bit makes result non-negative.

Differential Revision: https://reviews.llvm.org/D85000