Index: include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
===================================================================
--- include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
+++ include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
@@ -1263,6 +1263,20 @@
     return buildInstr(TargetOpcode::G_OR, {Dst}, {Src0, Src1});
   }
 
+  /// Build and insert \p Res = G_XOR \p Op0, \p Op1
+  MachineInstrBuilder buildXor(const DstOp &Dst, const SrcOp &Src0,
+                               const SrcOp &Src1) {
+    return buildInstr(TargetOpcode::G_XOR, {Dst}, {Src0, Src1});
+  }
+
+  /// Build and insert a bitwise not,
+  /// \p NegOne = G_CONSTANT -1
+  /// \p Res = G_OR \p Op0, NegOne
+  MachineInstrBuilder buildNot(const DstOp &Dst, const SrcOp &Src0) {
+    auto NegOne = buildConstant(Dst.getLLTTy(*getMRI()), -1);
+    return buildInstr(TargetOpcode::G_XOR, {Dst}, {Src0, NegOne});
+  }
+
   /// Build and insert \p Res = G_FADD \p Op0, \p Op1
   MachineInstrBuilder buildFAdd(const DstOp &Dst, const SrcOp &Src0,
                                 const SrcOp &Src1) {
Index: unittests/CodeGen/GlobalISel/MachineIRBuilderTest.cpp
===================================================================
--- unittests/CodeGen/GlobalISel/MachineIRBuilderTest.cpp
+++ unittests/CodeGen/GlobalISel/MachineIRBuilderTest.cpp
@@ -171,3 +171,31 @@
 
   EXPECT_TRUE(CheckMachineFunction(*MF, CheckStr)) << *MF;
 }
+
+TEST_F(GISelMITest, BuildXor) {
+  if (!TM)
+    return;
+
+  LLT S64 = LLT::scalar(64);
+  LLT S128 = LLT::scalar(128);
+  SmallVector<unsigned, 4> Copies;
+  collectCopies(Copies, MF);
+  B.buildXor(S64, Copies[0], Copies[1]);
+  B.buildNot(S64, Copies[0]);
+
+  // Make sure this works with > 64-bit types
+  auto Merge = B.buildMerge(S128, {Copies[0], Copies[1]});
+  B.buildNot(S128, Merge);
+  auto CheckStr = R"(
+  ; CHECK: [[COPY0:%[0-9]+]]:_(s64) = COPY $x0
+  ; CHECK: [[COPY1:%[0-9]+]]:_(s64) = COPY $x1
+  ; CHECK: [[XOR0:%[0-9]+]]:_(s64) = G_XOR [[COPY0]]:_, [[COPY1]]:_
+  ; CHECK: [[NEGONE64:%[0-9]+]]:_(s64) = G_CONSTANT i64 -1
+  ; CHECK: [[XOR1:%[0-9]+]]:_(s64) = G_XOR [[COPY0]]:_, [[NEGONE64]]:_
+  ; CHECK: [[MERGE:%[0-9]+]]:_(s128) = G_MERGE_VALUES [[COPY0]]:_(s64), [[COPY1]]:_(s64)
+  ; CHECK: [[NEGONE128:%[0-9]+]]:_(s128) = G_CONSTANT i128 -1
+  ; CHECK: [[XOR2:%[0-9]+]]:_(s128) = G_XOR [[MERGE]]:_, [[NEGONE128]]:_
+  )";
+
+  EXPECT_TRUE(CheckMachineFunction(*MF, CheckStr)) << *MF;
+}