R600: Fix scheduler crash caused by invalid MachinePointerInfo

Kernel function arguments are lowered to loads from the PARAM_I address
space.  When creating these load instructions, we were initializing
their MachinePointerInfo with an Arguement object that was not attached
to any function.  This was causing the MachineScheduler to crash when
it tried to access the parent of the Arguement.

This has been fixed by initializing the MachinePointerInfo with a
UndefValue instead.

NOTE: This is a candidate for the Mesa stable branch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175517 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/R600/R600ISelLowering.cpp b/lib/Target/R600/R600ISelLowering.cpp
index a7796b623035fc8d77c9f52d353737377fcc6e1e..b5c2a9307e4ecd4d657c7bd390c62dfe30025287 100644 (file)
--- a/lib/Target/R600/R600ISelLowering.cpp
+++ b/lib/Target/R600/R600ISelLowering.cpp
@@ -1039,7 +1039,7 @@ SDValue R600TargetLowering::LowerFormalArguments(
                                                     AMDGPUAS::PARAM_I_ADDRESS);
     SDValue Arg = DAG.getExtLoad(ISD::ZEXTLOAD, DL, VT, DAG.getRoot(),
                                 DAG.getConstant(ParamOffsetBytes, MVT::i32),
-                                       MachinePointerInfo(new Argument(PtrTy)),
+                                       MachinePointerInfo(UndefValue::get(PtrTy)),
                                        ArgVT, false, false, ArgBytes);
     InVals.push_back(Arg);
     ParamOffsetBytes += ArgBytes;