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

[YunQiang Su via llvm-commits]

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

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

>From a8906faf5dcf9f5fa96498f0f232f6d088c7b3bd Mon Sep 17 00:00:00 2001
From: YunQiang Su <syq at debian.org>
Date: Thu, 5 Sep 2024 23:33:20 +0800
Subject: [PATCH] SelectionDAG: Remove unneeded getSelectCC in
 expandFMINIMUMNUM_FMAXIMUMNUM

ISD::FCANONICALIZE is enough, which can process NaN or non-NaN
correctly, thus getSelectCC is not needed here.
---
 llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

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.