[llvm] Scalarize the vector inputs to llvm.lround intrinsic by default. (PR #101054)

[Matt Arsenault via llvm-commits]

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@@ -2063,6 +2063,12 @@ class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
     case Intrinsic::roundeven:
       ISD = ISD::FROUNDEVEN;
       break;
+    case Intrinsic::lround:
+      ISD = ISD::LROUND;
+      break;
+    case Intrinsic::llround:
+      ISD = ISD::LLROUND;
+      break;
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arsenm wrote:

This is a separate change that should get cost model tests 

https://github.com/llvm/llvm-project/pull/101054