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When propagating equalities, eg replacing A with B in every basic block

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dominated by Root, check that B is available throughout the scope.  This
is obviously true (famous last words?) given the current logic, but the
check may be helpful if more complicated reasoning is added one day.

llvm-svn: 153323
This commit is contained in:
Duncan Sands 2012-03-23 08:45:52 +00:00
parent 1ac68ded1a
commit fcc4791c7b
1 changed files with 3 additions and 0 deletions
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3
lib/Transforms/Scalar/GVN.cpp
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@ -2001,6 +2001,9 @@ bool GVN::propagateEquality(Value *LHS, Value *RHS, BasicBlock *Root) {
LVN = RVN;
}
}
assert((!isa<Instruction>(RHS) ||
DT->properlyDominates(cast<Instruction>(RHS)->getParent(), Root)) &&
"Instruction doesn't dominate scope!");
// If value numbering later deduces that an instruction in the scope is equal
// to 'LHS' then ensure it will be turned into 'RHS'.