[PATCH] D38421: Eliminate ftrunc if source is know to be rounded

[Hal Finkel via Phabricator via llvm-commits]

hfinkel added inline comments.


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Comment at: lib/CodeGen/SelectionDAG/DAGCombiner.cpp:10705
 
+  // fold ftrunc (known rounded int x) -> x
+  switch (N0.getOpcode()) {
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Is there any way we can generalize this? All of the operations listed here are like ftrunc in this regard (they're idempotent for integer inputs).



https://reviews.llvm.org/D38421