[llvm] SelectionDAG: Remove unneeded getSelectCC in expandFMINIMUMNUM_FMAXIMUMNUM (PR #107416)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-selectiondag

Author: YunQiang Su (wzssyqa)

<details>
<summary>Changes</summary>

ISD::FCANONICALIZE is enough, which can process NaN or non-NaN correctly, thus getSelectCC is not needed here.

---
Full diff: https://github.com/llvm/llvm-project/pull/107416.diff


1 Files Affected:

- (modified) llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp (+1-4) 


``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 01feec0c435edf..b7ddfeeaefcb7a 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -8616,10 +8616,7 @@ SDValue TargetLowering::expandFMINIMUMNUM_FMAXIMUMNUM(SDNode *Node,
   // If MinMax is NaN, let's quiet it.
   if (!Flags.hasNoNaNs() && !DAG.isKnownNeverNaN(LHS) &&
       !DAG.isKnownNeverNaN(RHS)) {
-    SDValue MinMaxQuiet =
-        DAG.getNode(ISD::FCANONICALIZE, DL, VT, MinMax, Flags);
-    MinMax =
-        DAG.getSelectCC(DL, MinMax, MinMax, MinMaxQuiet, MinMax, ISD::SETUO);
+    MinMax = DAG.getNode(ISD::FCANONICALIZE, DL, VT, MinMax, Flags);
   }
 
   // Fixup signed zero behavior.

``````````

</details>


https://github.com/llvm/llvm-project/pull/107416