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Use getSCEV instead of getUnknown to create a SCEV for a 

Constant. This lets ConstantInts be handled as SCEVConstant instead
of SCEVUnknown, as getUnknown no longer has special-case code for
ConstantInt and friends. This usually doesn't affect the final
output, since the constants end up getting folded later, but it
does make intermediate expressions more obvious in many cases.

llvm-svn: 74459
This commit is contained in:
Dan Gohman 2009-06-29 21:31:18 +00:00
parent 231898baf5
commit 9d203c636b
1 changed files with 3 additions and 3 deletions
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6
llvm/lib/Analysis/ScalarEvolution.cpp
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@ -3572,7 +3572,7 @@ const SCEV* ScalarEvolution::getSCEVAtScope(const SCEV *V, const Loop *L) {
Constant *RV = getConstantEvolutionLoopExitValue(PN,
BTCC->getValue()->getValue(),
LI);
if (RV) return getUnknown(RV);
if (RV) return getSCEV(RV);
}
}
@ -3586,7 +3586,7 @@ const SCEV* ScalarEvolution::getSCEVAtScope(const SCEV *V, const Loop *L) {
std::pair<std::map<const Loop *, Constant *>::iterator, bool> Pair =
Values.insert(std::make_pair(L, static_cast<Constant *>(0)));
if (!Pair.second)
return Pair.first->second ? &*getUnknown(Pair.first->second) : V;
return Pair.first->second ? &*getSCEV(Pair.first->second) : V;
std::vector<Constant*> Operands;
Operands.reserve(I->getNumOperands());
@ -3635,7 +3635,7 @@ const SCEV* ScalarEvolution::getSCEVAtScope(const SCEV *V, const Loop *L) {
C = ConstantFoldInstOperands(I->getOpcode(), I->getType(),
&Operands[0], Operands.size());
Pair.first->second = C;
return getUnknown(C);
return getSCEV(C);
}
}