[clang] [CLANG] Add warning when comparing to INF or NAN in fast math mode. (PR #76873)

[Andy Kaylor via cfe-commits]

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@@ -13044,9 +13044,12 @@ static QualType checkArithmeticOrEnumeralCompare(Sema &S, ExprResult &LHS,
   if (Type->isAnyComplexType() && BinaryOperator::isRelationalOp(Opc))
     return S.InvalidOperands(Loc, LHS, RHS);
 
-  // Check for comparisons of floating point operands using != and ==.
-  if (Type->hasFloatingRepresentation())
+  if (Type->hasFloatingRepresentation()) {
+    // Check for comparisons to NAN or INFINITY in fast math mode.
+    S.CheckInfNaNFloatComparison(Loc, LHS.get(), RHS.get(), Opc);
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andykaylor wrote:

Should this be done in CheckFloatComparison()?

https://github.com/llvm/llvm-project/pull/76873