[llvm] 79c7b7e - [X86] combineToExtendBoolVectorInReg - use SelectionDAG::getSplat helper instead of shuffle(scalar_to_vector(x))

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2024-11-08T16:49:29Z
New Revision: 79c7b7ee9f8b1cec13d9c1026e2bae9b9e91bc6f

URL: https://github.com/llvm/llvm-project/commit/79c7b7ee9f8b1cec13d9c1026e2bae9b9e91bc6f
DIFF: https://github.com/llvm/llvm-project/commit/79c7b7ee9f8b1cec13d9c1026e2bae9b9e91bc6f.diff

LOG: [X86] combineToExtendBoolVectorInReg - use SelectionDAG::getSplat helper instead of shuffle(scalar_to_vector(x))

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 33bfb32c0b2234..19a85a6d7ec6ce 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -46202,21 +46202,14 @@ static SDValue combineToExtendBoolVectorInReg(
     // widened bits won't be used, and this might allow the use of a broadcast
     // load.
     assert((EltSizeInBits % NumElts) == 0 && "Unexpected integer scale");
-    unsigned Scale = EltSizeInBits / NumElts;
-    EVT BroadcastVT =
-        EVT::getVectorVT(*DAG.getContext(), SclVT, NumElts * Scale);
-    Vec = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, BroadcastVT, N00);
-    ShuffleMask.append(NumElts * Scale, 0);
-    Vec = DAG.getVectorShuffle(BroadcastVT, DL, Vec, Vec, ShuffleMask);
-    Vec = DAG.getBitcast(VT, Vec);
+    EVT BroadcastVT = EVT::getVectorVT(*DAG.getContext(), SclVT,
+                                       (NumElts * EltSizeInBits) / NumElts);
+    Vec = DAG.getBitcast(VT, DAG.getSplat(BroadcastVT, DL, N00));
   } else {
     // For smaller scalar integers, we can simply any-extend it to the vector
     // element size (we don't care about the upper bits) and broadcast it to all
     // elements.
-    SDValue Scl = DAG.getAnyExtOrTrunc(N00, DL, SVT);
-    Vec = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, VT, Scl);
-    ShuffleMask.append(NumElts, 0);
-    Vec = DAG.getVectorShuffle(VT, DL, Vec, Vec, ShuffleMask);
+    Vec = DAG.getSplat(VT, DL, DAG.getAnyExtOrTrunc(N00, DL, SVT));
   }
 
   // Now, mask the relevant bit in each element.