[llvm] [LoopUnroll] Rotate loop before unrolling inside of UnrollRuntimeLoopRemainder (PR #148243)

[via llvm-commits]

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@@ -239,14 +239,16 @@ llvm::UnrollAndJamLoop(Loop *L, unsigned Count, unsigned TripCount,
 
   // We use the runtime remainder in cases where we don't know trip multiple
   if (TripMultiple % Count != 0) {
-    if (!UnrollRuntimeLoopRemainder(L, Count, /*AllowExpensiveTripCount*/ false,
-                                    /*UseEpilogRemainder*/ true,
-                                    UnrollRemainder, /*ForgetAllSCEV*/ false,
-                                    LI, SE, DT, AC, TTI, true,
-                                    SCEVCheapExpansionBudget, EpilogueLoop)) {
+    auto UnrollReminderResult = UnrollRuntimeLoopRemainder(
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annamthomas wrote:

Another idea in the main comment.

https://github.com/llvm/llvm-project/pull/148243