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TargetLowering: Don't index into empty string. 

(This is triggered by current lit tests)

llvm-svn: 192549
This commit is contained in:
Will Dietz 2013-10-13 03:08:49 +00:00
parent 9f21325ac7
commit ae726a93e3
1 changed files with 1 additions and 1 deletions
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2
llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@ -2012,7 +2012,7 @@ void TargetLowering::LowerAsmOperandForConstraint(SDValue Op,
std::pair<unsigned, const TargetRegisterClass*> TargetLowering::
getRegForInlineAsmConstraint(const std::string &Constraint,
MVT VT) const {
if (Constraint[0] != '{')
if (Constraint.empty() || Constraint[0] != '{')
return std::make_pair(0u, static_cast<TargetRegisterClass*>(0));
assert(*(Constraint.end()-1) == '}' && "Not a brace enclosed constraint?");