[llvm] [AArch64] Add flag to control unrolling for small multi-exit loops (PR #131998)

[Igor Kirillov via llvm-commits]

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@@ -4237,6 +4242,81 @@ getFalkorUnrollingPreferences(Loop *L, ScalarEvolution &SE,
   }
 }
 
+static bool shouldUnrollLoopWithInstruction(Instruction &I,
+                                            AArch64TTIImpl &TTI) {
+  // Don't unroll vectorised loop.
+  if (I.getType()->isVectorTy())
+    return false;
+
+  if (isa<CallInst>(I) || isa<InvokeInst>(I)) {
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igogo-x86 wrote:

I didn't know about that. :) But it looks like, with the current approach, `shouldUnrollLoopWithInstruction` will return true for `callbr`. Do we want to unroll that kind of loop?

https://github.com/llvm/llvm-project/pull/131998