Commit f383a47b authored by Simon Pilgrim's avatar Simon Pilgrim
Browse files

[X86][AVX] combineInsertSubvector - remove concat_vectors(load(x),load(x)) --> sub_vbroadcast(x) 

D58053/rL354340 added this to EltsFromConsecutiveLoads directly

llvm-svn: 354732
parent 398d0b9e

llvm/lib/Target/X86/X86ISelLowering.cpp

+0 −5
Original line number Diff line number Diff line
@@ -41949,11 +41949,6 @@ static SDValue combineInsertSubvector(SDNode *N, SelectionDAG &DAG, 
            return Ld;

        }

      }

      // If lower/upper loads are the same and there's no other use of the lower

      // load, then splat the loaded value with a broadcast.

      if (auto *Ld = dyn_cast<LoadSDNode>(peekThroughOneUseBitcasts(SubVec2)))

        if (SubVec2 == SubVec && ISD::isNormalLoad(Ld) && Vec.hasOneUse())

          return DAG.getNode(X86ISD::SUBV_BROADCAST, dl, OpVT, SubVec);















      // If this broadcast/subv_broadcast is inserted into both halves, use a















      // larger broadcast/subv_broadcast.