[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 llvm-commits at lists.llvm.org
Wed May 25 12:58:24 PDT 2016

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.


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