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If a vector is empty, you're not allowed to access any 

elements, even if it is only to take the address.  Test:
break-anti-dependencies.ll with ENABLE_EXPENSIVE_CHECKS.

llvm-svn: 62576
This commit is contained in:
Duncan Sands 2009-01-20 09:05:19 +00:00
parent 08c5dabf1b
commit cd3fbfb460
1 changed files with 3 additions and 2 deletions
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5
llvm/include/llvm/CodeGen/ScheduleDAGInstrs.h
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@ -49,10 +49,11 @@ namespace llvm {
///
SUnit *NewSUnit(MachineInstr *MI) {
#ifndef NDEBUG
const SUnit *Addr = &SUnits[0];
const SUnit *Addr = SUnits.empty() ? 0 : &SUnits[0];
#endif
SUnits.push_back(SUnit(MI, (unsigned)SUnits.size()));
assert(Addr == &SUnits[0] && "SUnits std::vector reallocated on the fly!");
assert((Addr == 0 || Addr == &SUnits[0]) &&
"SUnits std::vector reallocated on the fly!");
SUnits.back().OrigNode = &SUnits.back();
return &SUnits.back();
}