[PATCH] D85548: Allow fneg + strict_fadd -> strict_fsub in DAGCombiner

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added inline comments.


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Comment at: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:12824
+  // fold (strict_fadd A, (fneg B)) -> (strict_fsub A, B)
+  if (!LegalOperations || TLI.isOperationLegalOrCustom(ISD::STRICT_FSUB, VT))
+    if (SDValue NegN1 = TLI.getCheaperNegatedExpression(
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There is some strange legality predicate you are supposed to use for the strict cases, although I don't fully understand it


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  https://reviews.llvm.org/D85548/new/

https://reviews.llvm.org/D85548