[all-commits] [llvm/llvm-project] c1cd69: [InstSimplify] Simplify bool icmp with not in LHS

[Hasyimi Bahrudin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c1cd698a5228ef687641fdf34742dec80a08e085
      https://github.com/llvm/llvm-project/commit/c1cd698a5228ef687641fdf34742dec80a08e085
  Author: Hasyimi Bahrudin <hasyimi at gatech.edu>
  Date:   2021-12-09 (Thu, 09 Dec 2021)

  Changed paths:
    M llvm/lib/Analysis/InstructionSimplify.cpp
    M llvm/test/Transforms/InstSimplify/icmp-not-bool-constant.ll

  Log Message:
  -----------
  [InstSimplify] Simplify bool icmp with not in LHS

Refer to https://llvm.org/PR52546.

Simplifies the following cases:
    not(X) == 0 -> X != 0 -> X
    not(X) <=u 0 -> X >u 0 -> X
    not(X) >=s 0 -> X <s 0 -> X
    not(X) != 1 -> X == 1 -> X
    not(X) <=u 1 -> X >=u 1 -> X
    not(X) >s 1 -> X <=s -1 -> X

Differential Revision: https://reviews.llvm.org/D114666