[PATCH] D78291: [NFC][DAGCombine] Adding three helper functions and change the getNegatedExpression to negateExpression

[Qing Shan Zhang via Phabricator via llvm-commits]

steven.zhang marked an inline comment as done.
steven.zhang added inline comments.


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Comment at: llvm/include/llvm/CodeGen/TargetLowering.h:3547
+  virtual SDValue negateExpression(SDValue Op, SelectionDAG &DAG, bool LegalOps,
+                                   bool OptForSize, unsigned Depth = 0) const;
+
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RKSimon wrote:
> Its annoying that we're introducing negateExpression that will then go away again in D77319 - is there anyway to avoid creating negateExpression?
Old getNegatedExpression means always negate the expr and never fail. We are changing the sematics to allow it failing if return null. And we need both the old getNegatedExpression and new one in this nfc patch. So I have to rename it. The negateExpression is only called inside target lowering，and merged with getNegatibleCost into getNegatedExpression in D77319. I don't have good idea not to rename it. Do you have any idea ？


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https://reviews.llvm.org/D78291