[llvm] [SLP]Support revectorization of the previously vectorized scalars (PR #133091)

[Alexey Bataev via llvm-commits]

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@@ -4814,12 +4803,19 @@ class BoUpSLP {
         ProcessBundleMember(SD, nullptr);
       } else {
         ScheduleBundle &Bundle = *cast<ScheduleBundle>(Data);
-        for_each(Bundle.getBundle(), [](ScheduleData *SD) {
-          SD->setScheduled(/*Scheduled=*/true);
-        });
+        Bundle.setScheduled(/*Scheduled=*/true);
         LLVM_DEBUG(dbgs() << "SLP:   schedule " << Bundle << "\n");
-        for (ScheduleData *SD : Bundle.getBundle())
-          ProcessBundleMember(SD, &Bundle);
+        for (ScheduleData *SD : Bundle.getBundle()) {
+          if (ArrayRef<ScheduleBundle *> SDBundles =
+                  getScheduleBundles(SD->getInst());
+              !SDBundles.empty() &&
+              all_of(SDBundles, [&](const ScheduleBundle *SDBundle) {
+                return SDBundle->isScheduled();
+              })) {
+            SD->setScheduled(/*Scheduled=*/true);
+            ProcessBundleMember(SD, &Bundle);
+          }
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alexey-bataev wrote:

The lambda is not very hard to read, it is pretty simple.
SD cannot get the list of bundles in its context, it will require extra parameters, which does not look simpler

https://github.com/llvm/llvm-project/pull/133091