[flang] [clang] [clang-tools-extra] [llvm] [compiler-rt] [Legalizer] Expand fmaximum and fminimum (PR #67301)

[Matt Arsenault via cfe-commits]

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@@ -8201,6 +8201,66 @@ SDValue TargetLowering::expandFMINNUM_FMAXNUM(SDNode *Node,
   return SDValue();
 }
 
+SDValue TargetLowering::expandFMINIMUM_FMAXIMUM(SDNode *N,
+                                                SelectionDAG &DAG) const {
+  SDLoc DL(N);
+  SDValue LHS = N->getOperand(0);
+  SDValue RHS = N->getOperand(1);
+  unsigned Opc = N->getOpcode();
+  EVT VT = N->getValueType(0);
+  EVT CCVT = getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), VT);
+  bool NoNaN = (N->getFlags().hasNoNaNs() ||
+                (DAG.isKnownNeverNaN(LHS) && DAG.isKnownNeverNaN(RHS)));
+  bool NoZeroSign =
+      (N->getFlags().hasNoSignedZeros() || DAG.isKnownNeverZeroFloat(LHS) ||
+       DAG.isKnownNeverZeroFloat(RHS));
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arsenm wrote:

Can you defer these checks as late as possible?

https://github.com/llvm/llvm-project/pull/67301