[llvm] 8139900 - [X86] combineOrShiftToFunnelShift - use isOperationLegalOrCustom to check FSHL/FSHR support

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2019-10-30T11:52:22Z
New Revision: 81399002aeafe35b13c2bea10da11c3cc4c11946

URL: https://github.com/llvm/llvm-project/commit/81399002aeafe35b13c2bea10da11c3cc4c11946
DIFF: https://github.com/llvm/llvm-project/commit/81399002aeafe35b13c2bea10da11c3cc4c11946.diff

LOG: [X86] combineOrShiftToFunnelShift - use isOperationLegalOrCustom to check FSHL/FSHR support

Remove hard wired legality check.

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86ISelLowering.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index c407efb543bd..ccb8e8aa76b3 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -39599,7 +39599,8 @@ static SDValue combineOrShiftToFunnelShift(SDNode *N, SelectionDAG &DAG,
   EVT VT = N->getValueType(0);
   const TargetLowering &TLI = DAG.getTargetLoweringInfo();
 
-  if (VT != MVT::i16 && VT != MVT::i32 && VT != MVT::i64)
+  if (!TLI.isOperationLegalOrCustom(ISD::FSHL, VT) ||
+      !TLI.isOperationLegalOrCustom(ISD::FSHR, VT))
     return SDValue();
 
   // fold (or (x << c) | (y >> (64 - c))) ==> (shld64 x, y, c)