From 7c7aba6e5fef47a01a136be655b0a92cfd7090f6 Mon Sep 17 00:00:00 2001 From: Dimitry Andric Date: Fri, 16 Jun 2017 21:03:24 +0000 Subject: Vendor import of llvm trunk r305575: https://llvm.org/svn/llvm-project/llvm/trunk@305575 --- lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'lib/CodeGen/SelectionDAG/SelectionDAG.cpp') diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index dff8bd2ad37d..7abdc76cb004 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -7244,6 +7244,24 @@ void SelectionDAG::TransferDbgValues(SDValue From, SDValue To) { AddDbgValue(I, ToNode, false); } +void SelectionDAG::makeEquivalentMemoryOrdering(LoadSDNode *OldLoad, + SDValue NewMemOp) { + assert(isa(NewMemOp.getNode()) && "Expected a memop node"); + if (!OldLoad->hasAnyUseOfValue(1)) + return; + + // The new memory operation must have the same position as the old load in + // terms of memory dependency. Create a TokenFactor for the old load and new + // memory operation and update uses of the old load's output chain to use that + // TokenFactor. + SDValue OldChain = SDValue(OldLoad, 1); + SDValue NewChain = SDValue(NewMemOp.getNode(), 1); + SDValue TokenFactor = + getNode(ISD::TokenFactor, SDLoc(OldLoad), MVT::Other, OldChain, NewChain); + ReplaceAllUsesOfValueWith(OldChain, TokenFactor); + UpdateNodeOperands(TokenFactor.getNode(), OldChain, NewChain); +} + //===----------------------------------------------------------------------===// // SDNode Class //===----------------------------------------------------------------------===// -- cgit v1.3