[llvm] [AArch64][GlobalISel] Perfect Shuffles (PR #106446)

[Matt Arsenault via llvm-commits]

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@@ -1365,6 +1365,24 @@ class MachineIRBuilder {
                                                const SrcOp &Elt,
                                                const SrcOp &Idx);
 
+  /// Build and insert \p Res = G_INSERT_VECTOR_ELT \p Val, \p Elt, \p Idx
+  ///
+  /// \pre setBasicBlock or setMI must have been called.
+  /// \pre \p Res must be a generic virtual register with scalar type.
+  /// \pre \p Val must be a generic virtual register with vector type.
+  /// \pre \p Elt must be a generic virtual register with scalar type.
+  ///
+  /// \return The newly created instruction.
+  MachineInstrBuilder buildInsertVectorElementConstant(const DstOp &Res,
+                                                       const SrcOp &Val,
+                                                       const SrcOp &Elt,
+                                                       const int Idx) {
+    auto TLI = getMF().getSubtarget().getTargetLowering();
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arsenm wrote:

no auto

https://github.com/llvm/llvm-project/pull/106446