Index: mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td
===================================================================
--- mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td
+++ mlir/lib/Dialect/Arith/IR/ArithCanonicalization.td
@@ -115,6 +115,16 @@
           (Arith_ConstantOp ConstantAttr<I1Attr, "1">)),
         (Arith_CmpIOp (InvertPredicate $pred), $a, $b)>;
 
+// xor extui(x), extui(y) -> extui(xor(x,y))
+def XOrIOfExtUI :
+    Pat<(Arith_XOrIOp (Arith_ExtUIOp $x), (Arith_ExtUIOp $y)), (Arith_ExtUIOp (Arith_XOrIOp $x, $y)),
+      [(Constraint<CPred<"$0.getType() == $1.getType()">> $x, $y)]>;
+
+// xor extsi(x), extsi(y) -> extsi(xor(x,y))
+def XOrIOfExtSI :
+    Pat<(Arith_XOrIOp (Arith_ExtSIOp $x), (Arith_ExtSIOp $y)), (Arith_ExtSIOp (Arith_XOrIOp $x, $y)),
+      [(Constraint<CPred<"$0.getType() == $1.getType()">> $x, $y)]>;
+
 //===----------------------------------------------------------------------===//
 // CmpIOp
 //===----------------------------------------------------------------------===//
Index: mlir/lib/Dialect/Arith/IR/ArithOps.cpp
===================================================================
--- mlir/lib/Dialect/Arith/IR/ArithOps.cpp
+++ mlir/lib/Dialect/Arith/IR/ArithOps.cpp
@@ -707,7 +707,7 @@
 
 void arith::XOrIOp::getCanonicalizationPatterns(RewritePatternSet &patterns,
                                                 MLIRContext *context) {
-  patterns.add<XOrINotCmpI>(context);
+  patterns.add<XOrINotCmpI, XOrIOfExtUI, XOrIOfExtSI>(context);
 }
 
 //===----------------------------------------------------------------------===//
Index: mlir/test/Dialect/Arith/canonicalize.mlir
===================================================================
--- mlir/test/Dialect/Arith/canonicalize.mlir
+++ mlir/test/Dialect/Arith/canonicalize.mlir
@@ -317,6 +317,28 @@
   return %res : i64
 }
 
+// CHECK-LABEL: @xorOfExtSI
+//       CHECK:  %[[comb:.+]] = arith.xori %arg0, %arg1 : i8
+//       CHECK:  %[[ext:.+]] = arith.extsi %[[comb]] : i8 to i64
+//       CHECK:   return %[[ext]]
+func.func @xorOfExtSI(%arg0: i8, %arg1: i8) -> i64 {
+  %ext0 = arith.extsi %arg0 : i8 to i64
+  %ext1 = arith.extsi %arg1 : i8 to i64
+  %res = arith.xori %ext0, %ext1 : i64
+  return %res : i64
+}
+
+// CHECK-LABEL: @xorOfExtUI
+//       CHECK:  %[[comb:.+]] = arith.xori %arg0, %arg1 : i8
+//       CHECK:  %[[ext:.+]] = arith.extui %[[comb]] : i8 to i64
+//       CHECK:   return %[[ext]]
+func.func @xorOfExtUI(%arg0: i8, %arg1: i8) -> i64 {
+  %ext0 = arith.extui %arg0 : i8 to i64
+  %ext1 = arith.extui %arg1 : i8 to i64
+  %res = arith.xori %ext0, %ext1 : i64
+  return %res : i64
+}
+
 // -----
 
 // CHECK-LABEL: @indexCastOfSignExtend