[clang] [OpenMP] Tile/stripe followed by reverse (PR #222401)

[Michael Klemm via cfe-commits]

================
@@ -177,6 +178,12 @@ bool OMPLoopBasedDirective::doForAllLoops(
         OnTransformationCallback) {
   CurStmt = ignoreContainersKeepingIntraTileHint(CurStmt);
   for (unsigned Cnt = 0; Cnt < NumLoops; ++Cnt) {
+    // If we peel a loop-transformation directive, the enclosing ForStmt is
+    // compiler-synthesized and its body may hold helper statements (e.g.
+    // `reverse` injects `.reversed.iv` and update exprs) before the next
+    // loop. Scan it as an imperfect nest so that e.g. `omp tile` followed by
+    // `omp reverse` is accepted.
----------------
mjklemm wrote:

```suggestion
    // `reverse` injects `.reversed.iv` and update exprs) before the next
    // loop. Scan it as an imperfect nest so that, e.g., `omp tile` followed by
    // `omp reverse` is accepted.
```

https://github.com/llvm/llvm-project/pull/222401