R600/SI: return undef instead of null for skipped arguments

This is a candidate for the stable branch.

Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=64694

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Tested-by: Michel Dänzer <michel.daenzer@amd.com>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182084 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/R600/SIISelLowering.cpp b/lib/Target/R600/SIISelLowering.cpp
index 6bd82a5..98ef80f 100644 (file)
--- a/lib/Target/R600/SIISelLowering.cpp
+++ b/lib/Target/R600/SIISelLowering.cpp
@@ -156,8 +156,9 @@ SDValue SITargetLowering::LowerFormalArguments(
 
   for (unsigned i = 0, e = Ins.size(), ArgIdx = 0; i != e; ++i) {
 
+    const ISD::InputArg &Arg = Ins[i];
     if (Skipped & (1 << i)) {
-      InVals.push_back(SDValue());
+      InVals.push_back(DAG.getUNDEF(Arg.VT));
       continue;
     }
 
@@ -181,7 +182,6 @@ SDValue SITargetLowering::LowerFormalArguments(
     Reg = MF.addLiveIn(Reg, RC);
     SDValue Val = DAG.getCopyFromReg(Chain, DL, Reg, VT);
 
-    const ISD::InputArg &Arg = Ins[i];
     if (Arg.VT.isVector()) {
 
       // Build a vector from the registers