[clang] [flang] [mlir] [flang,acc] Support -ffp-maxmin-behavior option in lowering. (PR #184730)

[Razvan Lupusoru via cfe-commits]

================
@@ -47,16 +52,30 @@ def OpenACC_ReductionOperatorLogEqv  : I32EnumAttrCase<"AccEqv", 8, "eqv">;
 def OpenACC_ReductionOperatorLogNeqv : I32EnumAttrCase<"AccNeqv", 9, "neqv">;
 def OpenACC_ReductionOperatorLogAnd  : I32EnumAttrCase<"AccLand", 10, "land">;
 def OpenACC_ReductionOperatorLogOr   : I32EnumAttrCase<"AccLor", 11, "lor">;
-
-def OpenACC_ReductionOperator : I32EnumAttr<"ReductionOperator",
-    "built-in reduction operations supported by OpenACC",
-    [OpenACC_ReductionOperatorNone, OpenACC_ReductionOperatorAdd, 
-     OpenACC_ReductionOperatorMul, OpenACC_ReductionOperatorMax, OpenACC_ReductionOperatorMin,
-     OpenACC_ReductionOperatorAnd, OpenACC_ReductionOperatorOr,
-     OpenACC_ReductionOperatorXor, OpenACC_ReductionOperatorLogEqv,
-     OpenACC_ReductionOperatorLogNeqv, OpenACC_ReductionOperatorLogAnd,
-     OpenACC_ReductionOperatorLogOr
-    ]> {
+// The following reduction operators correspond to arith::AtomicRMWKind kinds
+// named alike. They can only be applied to floating-point types.
+// These reductions can be auto-parallelized.
+def OpenACC_ReductionOperatorMaximum
+    : I32EnumAttrCase<"AccMaximumf", 12, "maximumf">;
+def OpenACC_ReductionOperatorMinimum
+    : I32EnumAttrCase<"AccMinimumf", 13, "minimumf">;
+def OpenACC_ReductionOperatorMaxnum
+    : I32EnumAttrCase<"AccMaxnumf", 14, "maxnumf">;
+def OpenACC_ReductionOperatorMinnum
+    : I32EnumAttrCase<"AccMinnumf", 15, "minnumf">;
+
+def OpenACC_ReductionOperator
+    : I32EnumAttr<
+          "ReductionOperator",
+          "built-in reduction operations supported by OpenACC",
----------------
razvanlupusoru wrote:

Thank you - the comment is great.

https://github.com/llvm/llvm-project/pull/184730