[llvm] [LV] Disable interleaving via hints for uncountable early exit loops (PR #145877)

[David Sherwood via llvm-commits]

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@@ -10101,6 +10101,13 @@ bool LoopVectorizePass::processLoop(Loop *L) {
   // Get user vectorization factor and interleave count.
   ElementCount UserVF = Hints.getWidth();
   unsigned UserIC = Hints.getInterleave();
+  if (LVL.hasUncountableEarlyExit() && UserIC != 1 &&
+      !VectorizerParams::isInterleaveForced()) {
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david-arm wrote:

I think the problem then is that it becomes extremely difficult to write IR tests for any fixes. Any fixes would have to be unit tests.

https://github.com/llvm/llvm-project/pull/145877