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

[Tarun Prabhu via cfe-commits]

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@@ -7646,6 +7646,17 @@ def J : JoinedOrSeparate<["-"], "J">,
 
 let Visibility = [FC1Option] in {
 
+def ffp_maxmin_behavior_EQ
+    : Joined<["-"], "ffp-maxmin-behavior=">,
+      Flags<[HelpHidden]>,
+      Group<f_Group>,
+      Values<"legacy,portable,extremum,extremenum">,
+      HelpText<"Control MAX/MIN and [max|min][loc|val] behavior: "
+               "legacy (cmp+select), portable (same as legacy, "
+               " but may use max/minNum when -fno-signed-zeros "
+               "-fno-honor-nans), extremum (IEEE-754-2019 maximum/minimum), "
+               "extremenum (IEEE-754-2008 max/minNum)">;
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tarunprabhu wrote:

Do you know if the terms `extremum` and `extremenum` are "effectively standard"? I had to look closely to see the difference. They do make sense to me, it's just that they are so close to one another that I can see users making a mistake fairly easily. I was just wondering if there might be a different name one could use here. 

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