[llvm] [llvm][CodeGen] Resolve issues when updating live intervals in window scheduler (PR #101945)

[Hua Tian via llvm-commits]

=?utf-8?b?4oCcYWtpcmF0aWFu4oCd?= <akiratian at tencent.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/101945 at github.com>


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@@ -644,6 +645,20 @@ void WindowScheduler::expand() {
   MSE.cleanup();
 }
 
+void WindowScheduler::reanalyzeLiveIntervals() {
+  auto SlotIndex = Context->LIS->getSlotIndexes();
+  // Check if the SlotIndex infomation is missing.
+  for (auto &MBB : *MF)
+    for (auto &MI : MBB)
+      if (!SlotIndex->hasIndex(MI)) {
+        // The slot index and live intervals of MF have been corrupted and need
+        // to be reanalyzed.
+        SlotIndex->reanalyze(*MF);
+        Context->LIS->reanalyze(*MF);
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huaatian wrote:

You are right. 
The issue occurs in the ModuloScheduleExpander module. We have avoided the current problem by adding the minimal amount of live interval information, without affecting the window scheduler.

https://github.com/llvm/llvm-project/pull/101945