[llvm] Vectorize: Support fminimumnum and fmaximumnum (PR #131781)

[Matt Arsenault via llvm-commits]

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@@ -2776,6 +2776,12 @@ class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
       }
       return Cost;
     }
+    case Intrinsic::maximumnum:
+    case Intrinsic::minimumnum: {
+      if (TLI->isOperationLegalOrPromote(llvm::ISD::FMAXNUM_IEEE, LT.second))
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arsenm wrote:

I don't think this really needs to be that detailed. Plus you can always directly query for the cost of the canonicalize intrinsic (some of the other costs here have long sequences of getIntrinsicInstrCost with some assumed expansion, but it's kind of annoying).

Should check the right ISD for the right intrinsic too 

https://github.com/llvm/llvm-project/pull/131781