[llvm] [LoopVectorize] Improve Vectorization of Low Trip Count Loops (PR #195823)

[Florian Hahn via llvm-commits]

================
@@ -415,6 +415,11 @@ static cl::opt<bool> EnableEarlyExitVectorizationWithSideEffects(
     cl::desc("Enable vectorization of early exit loops with uncountable exits "
              "and side effects"));
 
+static cl::opt<unsigned> LowTripCountLoopBodySizeLimit(
+    "low-trip-count-loop-body-size-limit", cl::init(20), cl::Hidden,
+    cl::desc("Minimum loop size for loops trip counts "
+             "below tail folding threshold"));
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fhahn wrote:

nit: maybe slightly more descriptive, something like
```suggestion
    cl::desc("Minimum number of instruction to vectorize loops with trip counts below tail folding threshold"));
```

https://github.com/llvm/llvm-project/pull/195823