[PATCH] D29443: [DAGCombine] Combine composition of ADDC(ADDE)

[Amjad Aboud via Phabricator via llvm-commits]

aaboud added inline comments.


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Comment at: lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1919
+  if (!N->hasAnyUseOfValue(1)) {
+    // (adde (add|addc X, Y), 0, Carry) -> (adde X, Y, Carry)
+    if ((N0.getOpcode() == ISD::ADD || N0.getOpcode() == ISD::ADDC) &&
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Is it worth checking that Carry != A:Carry, where A = add X, Y (or A = addc X, Y) ?


https://reviews.llvm.org/D29443