[PATCH] D65802: [DAGCombiner] Rebuild (setcc x, y, ==) from (xor (xor x, y), 1)

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added inline comments.


================
Comment at: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:13496-13499
+  // Transform (brcond (xor x, y)) -> (brcond (setcc, x, y, ne))
+  // Transform (brcond (xor (xor x, y), -1)) -> (brcond (setcc, x, y, eq))
+  if (N.getOpcode() == ISD::XOR && N->hasOneUse() &&
+      (*N->use_begin())->getOpcode() == ISD::BRCOND) {
----------------
Why is this one-use restriction being introduced here?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D65802/new/

https://reviews.llvm.org/D65802