From da7e4017c6403dedf25f9e3740b22977bd3b6ad1 Mon Sep 17 00:00:00 2001 From: Nicolai Haehnle Date: Thu, 1 Dec 2016 14:04:13 +0000 Subject: [SelectionDAG] Rename and clarify visitFMULForFMADCombine (NFC) Summary: Suggested by @spatel in D26602. Reviewers: spatel, hfinkel Subscribers: spatel, llvm-commits Differential Revision: https://reviews.llvm.org/D27260 llvm-svn: 288336 --- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp') diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index a76c7a15b0d..57d866ad730 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -326,7 +326,7 @@ namespace { SDValue visitFADDForFMACombine(SDNode *N); SDValue visitFSUBForFMACombine(SDNode *N); - SDValue visitFMULForFMACombine(SDNode *N); + SDValue visitFMULForFMADistributiveCombine(SDNode *N); SDValue XformToShuffleWithZero(SDNode *N); SDValue ReassociateOps(unsigned Opc, const SDLoc &DL, SDValue LHS, @@ -8380,8 +8380,10 @@ SDValue DAGCombiner::visitFSUBForFMACombine(SDNode *N) { return SDValue(); } -/// Try to perform FMA combining on a given FMUL node. -SDValue DAGCombiner::visitFMULForFMACombine(SDNode *N) { +/// Try to perform FMA combining on a given FMUL node based on the distributive +/// law x * (y + 1) = x * y + x and variants thereof (commuted versions, +/// subtraction instead of addition). +SDValue DAGCombiner::visitFMULForFMADistributiveCombine(SDNode *N) { SDValue N0 = N->getOperand(0); SDValue N1 = N->getOperand(1); EVT VT = N->getValueType(0); @@ -8776,7 +8778,7 @@ SDValue DAGCombiner::visitFMUL(SDNode *N) { } // FMUL -> FMA combines: - if (SDValue Fused = visitFMULForFMACombine(N)) { + if (SDValue Fused = visitFMULForFMADistributiveCombine(N)) { AddToWorklist(Fused.getNode()); return Fused; } -- cgit v1.2.3