[flang] [llvm] [mlir] [flang][OpenMP] Enable tiling (PR #143715)

[Jan Leyonberg via llvm-commits]

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@@ -418,6 +420,28 @@ static void processHostEvalClauses(lower::AbstractConverter &converter,
               beginClauseList =
                   &std::get<parser::OmpClauseList>(beginDirective.t);
 
+              // For now we check if there is an inner OpenMPLoopConstruct, and
+              // extract the size clause from there
+              const auto &nestedOptional =
+                  std::get<std::optional<parser::NestedConstruct>>(
+                      ompConstruct.t);
+              assert(nestedOptional.has_value() &&
+                     "Expected a DoConstruct or OpenMPLoopConstruct");
+              const auto *innerConstruct =
+                  std::get_if<common::Indirection<parser::OpenMPLoopConstruct>>(
+                      &(nestedOptional.value()));
+              if (innerConstruct) {
+                const auto &innerLoopConstruct = innerConstruct->value();
+                const auto &innerBegin =
+                    std::get<parser::OmpBeginLoopDirective>(
+                        innerLoopConstruct.t);
+                const auto &innerDirective =
+                    std::get<parser::OmpLoopDirective>(innerBegin.t);
+                if (innerDirective.v == llvm::omp::Directive::OMPD_tile) {
+                  middleClauseList =
+                      &std::get<parser::OmpClauseList>(innerBegin.t);
+                }
+              }
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jsjodin wrote:

This was removed since we are only using constants for now. Later PRs will have to update this.

https://github.com/llvm/llvm-project/pull/143715