[PATCH] D130839: [DAG] FoldConstantArithmetic - add initial support for undef elements in bitcasted binop constant folding

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:5589
+          if (!(IsUndef1 || IsUndef2))
+            Fold = FoldValue(Opcode, C1, C2);
+          else if (Opcode == ISD::AND || Opcode == ISD::MUL)
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xiangzhangllvm wrote:
> Do we need to make sure the C1 C2 has no other uses ?
I don't think we have any one use limits on constant folding?


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https://reviews.llvm.org/D130839