[all-commits] [llvm/llvm-project] 5a7a45: [InstCombine] Fold `(c & ~(a | b)) | (b & ~(a | c)...

[Stanislav Mekhanoshin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5a7a458306cdab6ba534822b4c46c6a209ff26d9
      https://github.com/llvm/llvm-project/commit/5a7a458306cdab6ba534822b4c46c6a209ff26d9
  Author: Stanislav Mekhanoshin <Stanislav.Mekhanoshin at amd.com>
  Date:   2021-10-28 (Thu, 28 Oct 2021)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
    M llvm/test/Transforms/InstCombine/and-xor-or.ll

  Log Message:
  -----------
  [InstCombine] Fold `(c & ~(a | b)) | (b & ~(a | c))` to `~a & (b ^ c)`

```
----------------------------------------
define i4 @src(i4 %a, i4 %b, i4 %c) {
%0:
  %or1 = or i4 %a, %b
  %not1 = xor i4 %or1, 15
  %and1 = and i4 %not1, %c
  %or2 = or i4 %a, %c
  %not2 = xor i4 %or2, 15
  %and2 = and i4 %not2, %b
  %or3 = or i4 %and1, %and2
  ret i4 %or3
}
=>
define i4 @tgt(i4 %a, i4 %b, i4 %c) {
%0:
  %xor = xor i4 %b, %c
  %not = xor i4 %a, 15
  %or3 = and i4 %xor, %not
  ret i4 %or3
}
Transformation seems to be correct!
```

Differential Revision: https://reviews.llvm.org/D112276