diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 2c87d120cb7..c4cbeb00766 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -7426,6 +7426,14 @@ SDValue DAGCombiner::visitFADDForFMACombine(SDNode *N) { bool Aggressive = TLI.enableAggressiveFMAFusion(VT); bool LookThroughFPExt = TLI.isFPExtFree(VT); + // If we have two choices trying to fold (fadd (fmul u, v), (fmul x, y)), + // prefer to fold the multiply with fewer uses. + if (Aggressive && N0.getOpcode() == ISD::FMUL && + N1.getOpcode() == ISD::FMUL) { + if (N0.getNode()->use_size() > N1.getNode()->use_size()) + std::swap(N0, N1); + } + // fold (fadd (fmul x, y), z) -> (fma x, y, z) if (N0.getOpcode() == ISD::FMUL && (Aggressive || N0->hasOneUse())) { |
