Add sanity checks
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5020 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/InstSelectSimple.cpp b/lib/Target/X86/InstSelectSimple.cpp
index cad8e0d..d9feff1 100644
--- a/lib/Target/X86/InstSelectSimple.cpp
+++ b/lib/Target/X86/InstSelectSimple.cpp
@@ -35,6 +35,7 @@
MachineOpCode Opcode,
unsigned NumOperands,
unsigned DestReg) {
+ assert(I >= MBB->begin() && I <= MBB->end() && "Bad iterator!");
MachineInstr *MI = new MachineInstr(Opcode, NumOperands+1, true, true);
I = ++MBB->insert(I, MI);
return MachineInstrBuilder(MI).addReg(DestReg, MOTy::Def);
@@ -46,6 +47,7 @@
MachineBasicBlock::iterator &I,
MachineOpCode Opcode,
unsigned NumOperands) {
+ assert(I > MBB->begin() && I <= MBB->end() && "Bad iterator!");
MachineInstr *MI = new MachineInstr(Opcode, NumOperands, true, true);
I = ++MBB->insert(I, MI);
return MachineInstrBuilder(MI);