From Kalle Raiskila:
"the bigstack patch for SPU, with testcase. It is essentially the patch committed as 97091, and reverted as 97099, but with the following additions:
-in vararg handling, registers are marked to be live, to not confuse the register scavenger
-function prologue and epilogue are not emitted, if the stack size is 16. 16 means it is empty - there is only the register scavenger emergency spill slot, which is not used as there is no stack."
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99819 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/CellSPU/SPUISelLowering.cpp b/lib/Target/CellSPU/SPUISelLowering.cpp
index e863ee3..e7c7881 100644
--- a/lib/Target/CellSPU/SPUISelLowering.cpp
+++ b/lib/Target/CellSPU/SPUISelLowering.cpp
@@ -1107,7 +1107,8 @@
VarArgsFrameIndex = MFI->CreateFixedObject(StackSlotSize, ArgOffset,
true, false);
SDValue FIN = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
- SDValue ArgVal = DAG.getRegister(ArgRegs[ArgRegIdx], MVT::v16i8);
+ unsigned VReg = MF.addLiveIn(ArgRegs[ArgRegIdx], &SPU::R32CRegClass);
+ SDValue ArgVal = DAG.getRegister(VReg, MVT::v16i8);
SDValue Store = DAG.getStore(Chain, dl, ArgVal, FIN, NULL, 0,
false, false, 0);
Chain = Store.getOperand(0);