[llvm] 76a27f3 - [X86] Add getBitSelect helper function to create OR(AND(LHS,MASK),AND(RHS,~MASK)) bit select patterns. NFC.

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2023-06-27T18:16:51+01:00
New Revision: 76a27f3a32f619d386fb8efa1563ba21b76e9170

URL: https://github.com/llvm/llvm-project/commit/76a27f3a32f619d386fb8efa1563ba21b76e9170
DIFF: https://github.com/llvm/llvm-project/commit/76a27f3a32f619d386fb8efa1563ba21b76e9170.diff

LOG: [X86] Add getBitSelect helper function to create OR(AND(LHS,MASK),AND(RHS,~MASK)) bit select patterns. NFC.

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 f981057cbb17c..ead2d074fcd99 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -7162,6 +7162,14 @@ static SDValue getEXTEND_VECTOR_INREG(unsigned Opcode, const SDLoc &DL, EVT VT,
   return DAG.getNode(Opcode, DL, VT, In);
 }
 
+// Create OR(AND(LHS,MASK),AND(RHS,~MASK)) bit select pattern
+static SDValue getBitSelect(const SDLoc &DL, MVT VT, SDValue LHS, SDValue RHS,
+                            SDValue Mask, SelectionDAG &DAG) {
+  LHS = DAG.getNode(ISD::AND, DL, VT, LHS, Mask);
+  RHS = DAG.getNode(X86ISD::ANDNP, DL, VT, Mask, RHS);
+  return DAG.getNode(ISD::OR, DL, VT, LHS, RHS);
+}
+
 // Match (xor X, -1) -> X.
 // Match extract_subvector(xor X, -1) -> extract_subvector(X).
 // Match concat_vectors(xor X, -1, xor Y, -1) -> concat_vectors(X, Y).
@@ -13059,9 +13067,7 @@ static SDValue lowerShuffleAsBitBlend(const SDLoc &DL, MVT VT, SDValue V1,
   }
 
   SDValue V1Mask = DAG.getBuildVector(VT, DL, MaskOps);
-  V1 = DAG.getNode(ISD::AND, DL, VT, V1, V1Mask);
-  V2 = DAG.getNode(X86ISD::ANDNP, DL, VT, V1Mask, V2);
-  return DAG.getNode(ISD::OR, DL, VT, V1, V2);
+  return getBitSelect(DL, VT, V1, V2, V1Mask, DAG);
 }
 
 static SDValue getVectorMaskingNode(SDValue Op, SDValue Mask,