[mips] Make sure FuncArg doesn't advance when OrigArgIndex is the same as in the

previous iteration.

llvm-svn: 166850

diff --git a/llvm/lib/Target/Mips/MipsISelLowering.cpp b/llvm/lib/Target/Mips/MipsISelLowering.cpp
index d4a47b5..02674f5 100644 (file)
--- a/llvm/lib/Target/Mips/MipsISelLowering.cpp
+++ b/llvm/lib/Target/Mips/MipsISelLowering.cpp
@@ -2983,10 +2983,13 @@ MipsTargetLowering::LowerFormalArguments(SDValue Chain,
 
   Function::const_arg_iterator FuncArg =
     DAG.getMachineFunction().getFunction()->arg_begin();
+  unsigned CurArgIdx = 0;
   MipsCC::byval_iterator ByValArg = MipsCCInfo.byval_begin();
 
-  for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i, ++FuncArg) {
+  for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
     CCValAssign &VA = ArgLocs[i];
+    std::advance(FuncArg, Ins[i].OrigArgIndex - CurArgIdx);
+    CurArgIdx = Ins[i].OrigArgIndex;
     EVT ValVT = VA.getValVT();
     ISD::ArgFlagsTy Flags = Ins[i].Flags;
     bool IsRegLoc = VA.isRegLoc();

diff --git a/llvm/test/CodeGen/Mips/o32_cc_byval.ll b/llvm/test/CodeGen/Mips/o32_cc_byval.ll
index eac0d80..5558ba6 100644 (file)
--- a/llvm/test/CodeGen/Mips/o32_cc_byval.ll
+++ b/llvm/test/CodeGen/Mips/o32_cc_byval.ll
@@ -119,6 +119,16 @@ entry:
   ret void
 }
 
+%struct.S4 = type { [4 x i32] }
+
+define void @f5(i64 %a0, %struct.S4* nocapture byval %a1) nounwind {
+entry:
+  tail call void @f6(%struct.S4* byval %a1, i64 %a0) nounwind
+  ret void
+}
+
+declare void @f6(%struct.S4* nocapture byval, i64)
+
 !0 = metadata !{metadata !"int", metadata !1}
 !1 = metadata !{metadata !"omnipotent char", metadata !2}
 !2 = metadata !{metadata !"Simple C/C++ TBAA", null}