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Override dominates and properlyDominates for SCEVAddRecExpr, as a

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SCEVAddRecExpr doesn't necessarily dominate blocks merely dominated
by all of its operands. This fixes an abort compiling 403.gcc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96056 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-02-13 00:19:39 +00:00
parent 9c60f534cb
commit 39125d8ef9
2 changed files with 19 additions and 0 deletions
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15
lib/Analysis/ScalarEvolution.cpp
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@ -312,6 +312,21 @@ bool SCEVAddRecExpr::isLoopInvariant(const Loop *QueryLoop) const {
return true;
}
bool
SCEVAddRecExpr::dominates(BasicBlock *BB, DominatorTree *DT) const {
return DT->dominates(L->getHeader(), BB) &&
SCEVNAryExpr::dominates(BB, DT);
}
bool
SCEVAddRecExpr::properlyDominates(BasicBlock *BB, DominatorTree *DT) const {
// This uses a "dominates" query instead of "properly dominates" query because
// the instruction which produces the addrec's value is a PHI, and a PHI
// effectively properly dominates its entire containing block.
return DT->dominates(L->getHeader(), BB) &&
SCEVNAryExpr::properlyDominates(BB, DT);
}
void SCEVAddRecExpr::print(raw_ostream &OS) const {
OS << "{" << *Operands[0];
for (unsigned i = 1, e = Operands.size(); i != e; ++i)