diff options
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp index fb32487ac42..dda3fd92715 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp @@ -8798,11 +8798,19 @@ void SelectionDAGISel::LowerArguments(const Function &F) { SDB->setValue(&Arg, Res); if (!TM.Options.EnableFastISel && Res.getOpcode() == ISD::BUILD_PAIR) { + // We want to associate the argument with the frame index, among + // involved operands, that correspond to the lowest address. The + // getCopyFromParts function, called earlier, is swapping the order of + // the operands to BUILD_PAIR depending on endianness. The result of + // that swapping is that the least significant bits of the argument will + // be in the first operand of the BUILD_PAIR node, and the most + // significant bits will be in the second operand. + unsigned LowAddressOp = DAG.getDataLayout().isBigEndian() ? 1 : 0; if (LoadSDNode *LNode = - dyn_cast<LoadSDNode>(Res.getOperand(0).getNode())) + dyn_cast<LoadSDNode>(Res.getOperand(LowAddressOp).getNode())) if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(LNode->getBasePtr().getNode())) - FuncInfo->setArgumentFrameIndex(&Arg, FI->getIndex()); + FuncInfo->setArgumentFrameIndex(&Arg, FI->getIndex()); } // Update the SwiftErrorVRegDefMap. |
