[PATCH] D12697: [DAGCombine] Truncate BUILD_VECTOR operators if necessary when constant folding vectors

[James Molloy via llvm-commits]

jmolloy added a subscriber: jmolloy.

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Comment at: lib/CodeGen/SelectionDAG/DAGCombiner.cpp:13354
@@ +13353,3 @@
+      if (ST != VT)
+        FoldOp = DAG.getNode(ISD::ZERO_EXTEND, SDLoc(LHS), ST, FoldOp);
+
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I'd prefer to see this as ANY_EXTEND, as that more precisely describes that the upper bits are known to be undefined.

But shouldn't this only happen if we're in the post-legalize stage?


http://reviews.llvm.org/D12697