[PATCH] D150288: [SLP] Simplify `tryToVectorizeSequence()`

[Vasileios Porpodas via Phabricator via llvm-commits]

vporpo added inline comments.


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Comment at: llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp:14276
-    function_ref<bool(ArrayRef<T *>, bool)> TryToVectorizeHelper,
-    bool MaxVFOnly, BoUpSLP &R) {
   bool Changed = false;
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ABataev wrote:
> vporpo wrote:
> > ABataev wrote:
> > > Removal of this parameter causes regressions in the vectorization, better to restore it.
> > Do you have some examples where this is needed?
> No, I don't, just from my experience when I added this parameter. Testing showed regressions in LTO mode with it, IIRC.
Is this in SPEC?


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Comment at: llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp:14278-14280
+  MapVector<Type *, SmallVector<T *>> SeedsMap;
+  for (T *Seed : UnsortedSeeds)
+    SeedsMap[Seed->getType()].push_back(Seed);
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ABataev wrote:
> vporpo wrote:
> > ABataev wrote:
> > > It increases memory consumption.
> > The previous version was using a `Candidates` vector, this one is using a map, so the memory consumption should be fairly similar.
> > Also this is not a global data structure, it is being freed right away, so memory consumption shouldn't matter much in this context.
> It is not quite map, it is mapvector, which is vector + map
OK, so if I use an std::map would you be fine with this?


Repository:
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  https://reviews.llvm.org/D150288/new/

https://reviews.llvm.org/D150288