[PATCH] D139682: [DAG] Stop replace masked compressstore with normal masked store

[Phoebe Wang via Phabricator via llvm-commits]

pengfei added inline comments.


================
Comment at: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:11034
   // truncating store.  We can do this even if this is already a masked
-  // truncstore.
+  // truncstore or a compress store.
   if ((Value.getOpcode() == ISD::TRUNCATE) && Value->hasOneUse() &&
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pengfei wrote:
> xiangzhangllvm wrote:
> > pengfei wrote:
> > > Do you mean cannot be a compress store?
> > Yes, right
> Don't forget update the comments.
I meant the comment `We can do this even if this is already a masked truncstore or a compress store` is wrong. I'd expect it would be:
```
  // If this is a TRUNC followed by a masked store, fold this into a masked
  // truncating store.  We can do this even if this is already a masked
  // truncstore.
  // If this is a TRUNC followed by a compress store, we don't do the combine.
  // TODO: Try combine to masked compress store if possiable.
```


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  https://reviews.llvm.org/D139682/new/

https://reviews.llvm.org/D139682