[PATCH] D60457: [CodeGen] Fixed de-optimization of legalize subvector extract

[Eli Friedman via Phabricator via llvm-commits]

efriedma added inline comments.


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Comment at: lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp:4066
 
+  if (VT.isVector()) {
+    EVT EltVT = VT.getVectorElementType();
----------------
So if I'm following this correctly, this takes a cast like `<12 x i8>` -> `<3 x i32>`, and turns it into `<16 x i8>` -> `<4 x i32>`?  That makes sense, but please add a comment describing it.


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D60457/new/

https://reviews.llvm.org/D60457