Index: lib/Target/Mips/MipsInstrInfo.cpp
===================================================================
--- lib/Target/Mips/MipsInstrInfo.cpp
+++ lib/Target/Mips/MipsInstrInfo.cpp
@@ -104,7 +104,7 @@
 
   for (unsigned i = 1; i < Cond.size(); ++i) {
     if (Cond[i].isReg())
-      MIB.addReg(Cond[i].getReg());
+      MIB.addReg(Cond[i].getReg(), getRegState(Cond[i]));
     else if (Cond[i].isImm())
       MIB.addImm(Cond[i].getImm());
     else
Index: test/CodeGen/Mips/brundef.ll
===================================================================
--- /dev/null
+++ test/CodeGen/Mips/brundef.ll
@@ -0,0 +1,123 @@
+; RUN: llc -march=mips < %s > %t
+define void @ham.928() local_unnamed_addr #0 align 2 {
+bb:
+  %tmp = alloca [100 x i32], align 4
+  %tmp13 = ptrtoint [100 x i32]* %tmp to i32
+  switch i32 undef, label %bb35 [
+    i32 1, label %bb18
+    i32 0, label %bb19
+    i32 3, label %bb20
+    i32 2, label %bb21
+    i32 4, label %bb17
+  ]
+
+bb17:                                             ; preds = %bb
+  unreachable
+
+bb18:                                             ; preds = %bb
+  unreachable
+
+bb19:                                             ; preds = %bb
+  unreachable
+
+bb20:                                             ; preds = %bb
+  unreachable
+
+bb21:                                             ; preds = %bb
+  unreachable
+
+bb35:                                             ; preds = %bb
+  br label %bb69
+
+bb40:                                             ; preds = %bb171, %bb72, %bb71
+  %tmp41 = phi i32 [ %tmp13, %bb71 ], [ %tmp13, %bb72 ], [ %tmp13, %bb171 ]
+  %tmp55 = inttoptr i32 %tmp41 to i32*
+  %tmp58 = insertelement <2 x i32*> undef, i32* %tmp55, i32 1
+  br label %bb59
+
+bb59:                                             ; preds = %bb59, %bb40
+  %tmp60 = phi <2 x i32*> [ %tmp61, %bb59 ], [ %tmp58, %bb40 ]
+  %tmp61 = getelementptr i32, <2 x i32*> %tmp60, <2 x i32> <i32 -1, i32 1>
+  %tmp62 = extractelement <2 x i32*> %tmp61, i32 1
+  br label %bb59
+
+bb69:                                             ; preds = %bb35
+  %tmp70 = icmp eq i32 undef, -1
+  br i1 %tmp70, label %bb72, label %bb71
+
+bb71:                                             ; preds = %bb69
+  br label %bb40
+
+bb72:                                             ; preds = %bb69
+  br i1 undef, label %bb40, label %bb73
+
+bb73:                                             ; preds = %bb72
+  switch i32 undef, label %bb81 [
+    i32 1, label %bb79
+    i32 0, label %bb80
+    i32 3, label %bb76
+    i32 2, label %bb75
+    i32 4, label %bb74
+  ]
+
+bb74:                                             ; preds = %bb73
+  unreachable
+
+bb75:                                             ; preds = %bb73
+  unreachable
+
+bb76:                                             ; preds = %bb73
+  unreachable
+
+bb79:                                             ; preds = %bb73
+  ret void
+
+bb80:                                             ; preds = %bb73
+  unreachable
+
+bb81:                                             ; preds = %bb73
+  switch i32 undef, label %bb171 [
+    i32 1, label %bb169
+    i32 0, label %bb170
+    i32 3, label %bb168
+    i32 2, label %bb167
+    i32 4, label %bb83
+  ]
+
+bb83:                                             ; preds = %bb81
+  unreachable
+
+bb167:                                            ; preds = %bb81
+  unreachable
+
+bb168:                                            ; preds = %bb81
+  unreachable
+
+bb169:                                            ; preds = %bb81
+  unreachable
+
+bb170:                                            ; preds = %bb81
+  unreachable
+
+bb171:                                            ; preds = %bb81
+  switch i32 undef, label %bb40 [
+    i32 4, label %bb175
+    i32 2, label %bb180
+    i32 3, label %bb181
+  ]
+
+bb175:                                            ; preds = %bb171
+  unreachable
+
+bb180:                                            ; preds = %bb171
+  unreachable
+
+bb181:                                            ; preds = %bb171
+  unreachable
+}
+
+attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.ident = !{!0}
+
+!0 = !{!"DESRES-37 clang version 4.0.0  (based on LLVM 4.0.0)"}