[llvm] [LV] Support binary and unary operations with EVL-vectorization (PR #93854)

[Florian Hahn via llvm-commits]

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@@ -1366,6 +1373,49 @@ class VPWidenRecipe : public VPRecipeWithIRFlags {
 #endif
 };
 
+class VPWidenEVLRecipe : public VPWidenRecipe {
+  using VPRecipeWithIRFlags::transferFlags;
+
+public:
+  template <typename IterT>
+  VPWidenEVLRecipe(Instruction &I, iterator_range<IterT> Operands, VPValue &EVL)
+      : VPWidenRecipe(VPDef::VPWidenEVLSC, I, Operands) {
+    addOperand(&EVL);
+  }
+  VPWidenEVLRecipe(VPWidenRecipe *W, VPValue &EVL)
+      : VPWidenEVLRecipe(*W->getUnderlyingInstr(), W->operands(), EVL) {
+    this->transferFlags(*W);
+  }
+
+  ~VPWidenEVLRecipe() override = default;
+
+  VPWidenRecipe *clone() override final {
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fhahn wrote:

at the moment this is only used when vectorizing the epilogue, which is disabled for EVL-style vectorization for now, right? Other recipes that don't exercise the clone() use unreachable here.

https://github.com/llvm/llvm-project/pull/93854