[PATCH] D23893: [DAGCombine] Don't fold a trunc if it feeds an anyext

[Simon Pilgrim via llvm-commits]

RKSimon added a comment.

Are the mem-intrin-base-reg.ll changes relevant?


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Comment at: lib/CodeGen/SelectionDAG/DAGCombiner.cpp:7139
@@ +7138,3 @@
+  // If this is anyext(trunc), don't fold it, allow ourselves to be folded.
+  if (N->hasOneUse() && (N->use_begin()->getOpcode() == ISD::ANY_EXTEND))
+    return SDValue();
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Should we limit this to AfterLegalizeTypes or later?


https://reviews.llvm.org/D23893