[flang-commits] [flang] [flang] Add ETIME runtime and lowering intrinsics implementation (PR #90578)

[Michael Klemm via flang-commits]

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@@ -1340,6 +1340,12 @@ static const IntrinsicInterface intrinsicSubroutine[]{
             {"values", AnyInt, Rank::vector, Optionality::optional,
                 common::Intent::Out}},
         {}, Rank::elemental, IntrinsicClass::impureSubroutine},
+    {"etime",
+        {{"values", TypePattern{RealType, KindCode::exactKind, 4}, Rank::vector,
+             Optionality::required, common::Intent::Out},
+            {"time", TypePattern{RealType, KindCode::exactKind, 4},
+                Rank::scalar, Optionality::required, common::Intent::Out}},
+        {}, Rank::elemental, IntrinsicClass::impureSubroutine},
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mjklemm wrote:

This only supports the `call etime(ta, ti)` pattern of the `ETIME` intrinsic.  However, it also has a function form `ti = etime(at)`.  Support for this would also be needed, as it's being used by applications (despite being discouraged by the GFortran docs).  I was struggling with this, when I tried to make both forms work, as it seems the standard code-gen handlers only support either one. 

https://github.com/llvm/llvm-project/pull/90578