[llvm] [LV] Vectorize FMax w/o fast-math flags. (PR #146711)

[Ramkumar Ramachandra via llvm-commits]

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@@ -595,7 +596,8 @@ Value *VPInstruction::generate(VPTransformState &State) {
     llvm_unreachable("should be handled by VPPhi::execute");
   }
   case Instruction::Select: {
-    bool OnlyFirstLaneUsed = vputils::onlyFirstLaneUsed(this);
+    bool OnlyFirstLaneUsed =
+        State.VF.isScalar() || vputils::onlyFirstLaneUsed(this);
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artagnon wrote:

Seems unrelated?

https://github.com/llvm/llvm-project/pull/146711