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Some compilers are picky about accessing the first element of a std::vector if

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there's nothing in the vector. Pacify them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61536 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2009-01-01 01:14:31 +00:00
parent 1010941954
commit d5b207baab
1 changed files with 5 additions and 2 deletions
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7
include/llvm/CodeGen/ScheduleDAGSDNodes.h
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@ -103,10 +103,13 @@ namespace llvm {
/// ///
SUnit *NewSUnit(SDNode *N) { SUnit *NewSUnit(SDNode *N) {
#ifndef NDEBUG #ifndef NDEBUG
const SUnit *Addr = &SUnits[0]; const SUnit *Addr = 0;
if (SUnits.size() > 0)
Addr = &SUnits[0];
#endif #endif
SUnits.push_back(SUnit(N, (unsigned)SUnits.size())); SUnits.push_back(SUnit(N, (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(); SUnits.back().OrigNode = &SUnits.back();
return &SUnits.back(); return &SUnits.back();
} }