[llvm] Changed default value of slp-max-vf to 192 (PR #70479)

[Kiran Chandramohan via llvm-commits]

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@@ -138,8 +138,8 @@ MaxVectorRegSizeOption("slp-max-reg-size", cl::init(128), cl::Hidden,
     cl::desc("Attempt to vectorize for this register size in bits"));
 
 static cl::opt<unsigned>
-MaxVFOption("slp-max-vf", cl::init(0), cl::Hidden,
-    cl::desc("Maximum SLP vectorization factor (0=unlimited)"));
+    MaxVFOption("slp-max-vf", cl::init(192), cl::Hidden,
+                cl::desc("Maximum SLP vectorization factor (0=unlimited)"));
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kiranchandramohan wrote:

Can the usage of `SmallDenseSet` instead of `SmallSet` (below) go in without further info or investigation?

Would you have suggestions on how to share a reproducer, since the issue manifests only at LTO on a large benchmark 528.cam4_r (spec2017)?

https://github.com/llvm/llvm-project/pull/70479