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Remove the Expr member from IVUsers. Instead of remembering the expression,

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just ask ScalarEvolution for it on demand. This helps IVUsers be more robust
in the case of expressions changing underneath it. This fixes PR6862.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101819 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-04-19 21:48:58 +00:00
parent 22e401f5d4
commit c056454ecf
4 changed files with 65 additions and 58 deletions
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11
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@@ -1575,8 +1575,8 @@ LSRInstance::OptimizeLoopTermCond() {
!DT.properlyDominates(UI->getUser()->getParent(), ExitingBlock)) {
// Conservatively assume there may be reuse if the quotient of their
// strides could be a legal scale.
const SCEV *A = CondUse->getStride(L);
const SCEV *B = UI->getStride(L);
const SCEV *A = IU.getStride(*CondUse, L);
const SCEV *B = IU.getStride(*UI, L);
if (!A || !B) continue;
if (SE.getTypeSizeInBits(A->getType()) !=
SE.getTypeSizeInBits(B->getType())) {
@@ -1629,8 +1629,7 @@ LSRInstance::OptimizeLoopTermCond() {
ExitingBlock->getInstList().insert(TermBr, Cond);
// Clone the IVUse, as the old use still exists!
CondUse = &IU.AddUser(CondUse->getExpr(),
Cond, CondUse->getOperandValToReplace());
CondUse = &IU.AddUser(Cond, CondUse->getOperandValToReplace());
TermBr->replaceUsesOfWith(OldCond, Cond);
}
}
@@ -1748,7 +1747,7 @@ void LSRInstance::CollectInterestingTypesAndFactors() {
// Collect interesting types and strides.
SmallVector<const SCEV *, 4> Worklist;
for (IVUsers::const_iterator UI = IU.begin(), E = IU.end(); UI != E; ++UI) {
const SCEV *Expr = UI->getExpr();
const SCEV *Expr = IU.getExpr(*UI);
// Collect interesting types.
Types.insert(SE.getEffectiveSCEVType(Expr->getType()));
@@ -1819,7 +1818,7 @@ void LSRInstance::CollectFixupsAndInitialFormulae() {
AccessTy = getAccessType(LF.UserInst);
}
const SCEV *S = UI->getExpr();
const SCEV *S = IU.getExpr(*UI);
// Equality (== and !=) ICmps are special. We can rewrite (i == N) as
// (N - i == 0), and this allows (N - i) to be the expression that we work