[mips] Make sure there is a chain edge dependency between loads that read

formal arguments on the stack and stores created afterwards. We need this to
ensure tail call optimized function calls do not write over the argument area
of the stack before it is read out.
 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194309 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 3 deletions

diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index 7a0e666..5f82b4e 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -2650,9 +2650,11 @@ MipsTargetLowering::LowerFormalArguments(SDValue Chain,
 
       // Create load nodes to retrieve arguments from the stack
       SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
-      InVals.push_back(DAG.getLoad(ValVT, DL, Chain, FIN,
-                                   MachinePointerInfo::getFixedStack(FI),
-                                   false, false, false, 0));
+      SDValue Load = DAG.getLoad(ValVT, DL, Chain, FIN,
+                                 MachinePointerInfo::getFixedStack(FI),
+                                 false, false, false, 0);
+      InVals.push_back(Load);
+      OutChains.push_back(Load.getValue(1));
     }
   }