[llvm] [VPlan] Model first memory runtime checks as VPlan recipes. (PR #221483)

[Florian Hahn via llvm-commits]

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@@ -808,8 +808,11 @@ Value *VPInstruction::generate(VPTransformState &State) {
                   OnlyFirstLaneUsed || vputils::isSingleScalar(getOperand(0)));
     Value *Op1 = State.get(getOperand(1), OnlyFirstLaneUsed);
     Value *Op2 = State.get(getOperand(2), OnlyFirstLaneUsed);
-    return Builder.CreateSelectFMF(Cond, Op1, Op2, getFastMathFlagsOrNone(),
-                                   Name);
+    Value *Sel =
+        Builder.CreateSelectFMF(Cond, Op1, Op2, getFastMathFlagsOrNone(), Name);
+    if (auto *I = dyn_cast<Instruction>(Sel))
+      applyMetadata(*I);
+    return Sel;
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fhahn wrote:

This is only needed/testable via this patch. But I split off the whole pointer max handling that emits selects as we now also need the metadata changes to match IR SCEV expander and it has become quite a bit of extra code

https://github.com/llvm/llvm-project/pull/221483