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Fix crash in AggressiveAntiDepBreaker with empty CriticalPathSet

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If no register classes are added to CriticalPathRCs, then the CriticalPathSet
bitmask will be empty. In that case, ExcludeRegs must remain NULL or else this
line will cause a segfault:

  } else if ((ExcludeRegs != NULL) && ExcludeRegs->test(AntiDepReg)) {

I have no in-tree test case.

llvm-svn: 190584
This commit is contained in:
Hal Finkel 2013-09-12 04:22:31 +00:00
parent 6a507da088
commit c56d8f90fd
1 changed files with 1 additions and 1 deletions
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2
lib/CodeGen/AggressiveAntiDepBreaker.cpp
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@ -782,7 +782,7 @@ unsigned AggressiveAntiDepBreaker::BreakAntiDependencies(
if (MI == CriticalPathMI) {
CriticalPathSU = CriticalPathStep(CriticalPathSU);
CriticalPathMI = (CriticalPathSU) ? CriticalPathSU->getInstr() : 0;
} else {
} else if (CriticalPathSet.any()) {
ExcludeRegs = &CriticalPathSet;
}