================
@@ -14853,6 +14861,158 @@ StmtResult
SemaOpenMP::ActOnOpenMPReverseDirective(Stmt *AStmt,
buildPreInits(Context, PreInits));
}
+StmtResult SemaOpenMP::ActOnOpenMPInterchangeDirective(
+ ArrayRef<OMPClause *> Clauses, Stmt *AStmt, SourceLocation StartLoc,
+ SourceLocation EndLoc) {
+ ASTContext &Context = getASTContext();
+ DeclContext *CurContext = SemaRef.CurContext;
+ Scope *CurScope = SemaRef.getCurScope();
+
+ // Empty statement should only be possible if there already was an error.
+ if (!AStmt)
+ return StmtError();
+
+ // interchange without permutation clause swaps two loops.
+ constexpr size_t NumLoops = 2;
+
+ // Verify and diagnose loop nest.
+ SmallVector<OMPLoopBasedDirective::HelperExprs, 4> LoopHelpers(NumLoops);
+ Stmt *Body = nullptr;
+ SmallVector<SmallVector<Stmt *, 0>, 2> OriginalInits;
+ if (!checkTransformableLoopNest(OMPD_interchange, AStmt, NumLoops,
+ LoopHelpers, Body, OriginalInits))
+ return StmtError();
+
+ // Delay interchange to when template is completely instantiated.
+ if (CurContext->isDependentContext())
+ return OMPInterchangeDirective::Create(Context, StartLoc, EndLoc, Clauses,
+ NumLoops, AStmt, nullptr, nullptr);
+
+ assert(LoopHelpers.size() == NumLoops &&
+ "Expecting loop iteration space dimensionaly to match number of "
+ "affected loops");
+ assert(OriginalInits.size() == NumLoops &&
+ "Expecting loop iteration space dimensionaly to match number of "
+ "affected loops");
+
+ // Decode the permutation clause.
+ constexpr uint64_t Permutation[] = {1, 0};
+
+ // Find the affected loops.
+ SmallVector<Stmt *> LoopStmts(NumLoops, nullptr);
+ collectLoopStmts(AStmt, LoopStmts);
+
+ // Collect pre-init statements on the order before the permuation.
+ SmallVector<Stmt *> PreInits;
+ for (auto I : llvm::seq<int>(NumLoops)) {
+ OMPLoopBasedDirective::HelperExprs &LoopHelper = LoopHelpers[I];
+
+ assert(LoopHelper.Counters.size() == 1 &&
+ "Single-dimensional loop iteration space expected");
+ auto *OrigCntVar = cast<DeclRefExpr>(LoopHelper.Counters.front());
+
+ std::string OrigVarName = OrigCntVar->getNameInfo().getAsString();
----------------
alexey-bataev wrote:
Just saying, that better to use SmallString where possible. If you think,
std::string is good enough here, I'm fine with it. It was just a suggestion.
https://github.com/llvm/llvm-project/pull/93022
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