[llvm] 9c06c10 - [SelectionDAG] GetDemandedBits - fallback to SimplifyMultipleUseDemandedBits by default.

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2020-01-20T16:51:52Z
New Revision: 9c06c10fbae941feaf2738962d7ee58745b33725

URL: https://github.com/llvm/llvm-project/commit/9c06c10fbae941feaf2738962d7ee58745b33725
DIFF: https://github.com/llvm/llvm-project/commit/9c06c10fbae941feaf2738962d7ee58745b33725.diff

LOG: [SelectionDAG] GetDemandedBits - fallback to SimplifyMultipleUseDemandedBits by default.

First step towards removing SelectionDAG::GetDemandedBits entirely since it so similar to SimplifyMultipleUseDemandedBits anyhow.

Added: 
    

Modified: 
    llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 90476641d620..e191abb154fe 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2184,6 +2184,8 @@ SDValue SelectionDAG::GetDemandedBits(SDValue V, const APInt &DemandedBits,
                                       const APInt &DemandedElts) {
   switch (V.getOpcode()) {
   default:
+    return TLI->SimplifyMultipleUseDemandedBits(V, DemandedBits, DemandedElts,
+                                                *this, 0);
     break;
   case ISD::Constant: {
     auto *CV = cast<ConstantSDNode>(V.getNode());
@@ -2194,11 +2196,6 @@ SDValue SelectionDAG::GetDemandedBits(SDValue V, const APInt &DemandedBits,
       return getConstant(NewVal, SDLoc(V), V.getValueType());
     break;
   }
-  case ISD::OR:
-  case ISD::XOR:
-  case ISD::SIGN_EXTEND_INREG:
-    return TLI->SimplifyMultipleUseDemandedBits(V, DemandedBits, DemandedElts,
-                                                *this, 0);
   case ISD::SRL:
     // Only look at single-use SRLs.
     if (!V.getNode()->hasOneUse())