[flang-commits] [flang] [mlir] [Flang][OpenMP] Privatize descriptors for assumed shape array maps for performance increase (PR #212336)

[Pranav Bhandarkar via flang-commits]

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@@ -7424,16 +7437,26 @@ static void processMapWithMembersOf(LLVM::ModuleTranslation &moduleTranslation,
 
   llvm::omp::OpenMPOffloadMappingFlags memberOfFlag =
       ompBuilder.getMemberOfFlag(combinedInfo.Types.size());
-  for (size_t i = 0; i < mapInfoIdx.size(); i++) {
-    // Index == 0 is the parent map and if it gets here it's an unattachable
-    // type and should have OMP_MAP_TARGET_PARAM applied and no MEMBER_OF flag.
-    if (i == 0) {
+
+  // The first index is the parent map, the rest are its members. The parent
+  // normally undergoes the standard parent-with-members mapping, contributing
+  // the MEMBER_OF flag that binds each member to it. The one exception is a
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bhandarkar-pranav wrote:

Got it, now this makes sense to me. So, we still have to emit the parent as a map but not all of its members and it seems it only gets emitted as `OMP_MAP_NONE` after all.

https://github.com/llvm/llvm-project/pull/212336