[PATCH] D20387: [AArch64] Generate a BFI/BFXIL from 'or (and X, MaskImm), OrImm' iff the value being inserted only sets known zero bits.

[Chad Rosier via llvm-commits]

mcrosier marked 3 inline comments as done.

================
Comment at: lib/Target/AArch64/AArch64ISelDAGToDAG.cpp:2023
@@ +2022,3 @@
+  if (!isShiftedMask(KnownZero.getZExtValue(), VT))
+    return false;
+
----------------
I agree this may be conservative, but I'm going to defer this improvement for the moment.


http://reviews.llvm.org/D20387