Add ExprConstant support

Author: wzssyqa

clang/lib/AST/ExprConstant.cpp

@@ -15310,6 +15310,33 @@ bool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) {
       Result = RHS;
     return true;
   }
+
+  case Builtin::BI__builtin_fmaximum_num:
+  case Builtin::BI__builtin_fmaximum_numf:
+  case Builtin::BI__builtin_fmaximum_numl:
+  case Builtin::BI__builtin_fmaximum_numf16:
+  case Builtin::BI__builtin_fmaximum_numf128: {
+    APFloat RHS(0.);
+    if (!EvaluateFloat(E->getArg(0), Result, Info) ||
+        !EvaluateFloat(E->getArg(1), RHS, Info))
+      return false;
+    Result = maximumnum(Result, RHS);
+    return true;
+  }
+
+  case Builtin::BI__builtin_fminimum_num:
+  case Builtin::BI__builtin_fminimum_numf:
+  case Builtin::BI__builtin_fminimum_numl:
+  case Builtin::BI__builtin_fminimum_numf16:
+  case Builtin::BI__builtin_fminimum_numf128: {
+    APFloat RHS(0.);
+    if (!EvaluateFloat(E->getArg(0), Result, Info) ||
+        !EvaluateFloat(E->getArg(1), RHS, Info))
+      return false;
+    Result = minimumnum(Result, RHS);
+    return true;
+  }
+
   }
 }
 

clang/test/Preprocessor/feature_tests.cpp

@@ -58,7 +58,9 @@
 
 // Check __has_constexpr_builtin
 #if  !__has_constexpr_builtin(__builtin_fmax) || \
-     !__has_constexpr_builtin(__builtin_fmin)
+     !__has_constexpr_builtin(__builtin_fmin) || \
+     !__has_constexpr_builtin(__builtin_fmaximum_num) || \
+     !__has_constexpr_builtin(__builtin_fmaximum_num)
 #error Clang should have these constexpr builtins
 #endif