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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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32
include/llvm/Analysis/IVUsers.h
View File

@ -36,9 +36,8 @@ class IVUsers;
class IVStrideUse : public CallbackVH, public ilist_node<IVStrideUse> {
friend class IVUsers;
public:
IVStrideUse(IVUsers *P, const SCEV *E,
Instruction* U, Value *O)
: CallbackVH(U), Parent(P), Expr(E), OperandValToReplace(O) {
IVStrideUse(IVUsers *P, Instruction* U, Value *O)
: CallbackVH(U), Parent(P), OperandValToReplace(O) {
}
/// getUser - Return the user instruction for this use.
@ -51,20 +50,6 @@ public:
setValPtr(NewUser);
}
/// getParent - Return a pointer to the IVUsers that owns
/// this IVStrideUse.
IVUsers *getParent() const { return Parent; }
/// getExpr - Return the expression for the use.
const SCEV *getExpr() const { return Expr; }
/// setExpr - Assign a new expression to this use.
void setExpr(const SCEV *Val) {
Expr = Val;
}
const SCEV *getStride(const Loop *L) const;
/// getOperandValToReplace - Return the Value of the operand in the user
/// instruction that this IVStrideUse is representing.
Value *getOperandValToReplace() const {
@ -91,9 +76,6 @@ private:
/// Parent - a pointer to the IVUsers that owns this IVStrideUse.
IVUsers *Parent;
/// Expr - The expression for this use.
const SCEV *Expr;
/// OperandValToReplace - The Value of the operand in the user instruction
/// that this IVStrideUse is representing.
WeakVH OperandValToReplace;
@ -161,12 +143,16 @@ public:
/// return true. Otherwise, return false.
bool AddUsersIfInteresting(Instruction *I);
IVStrideUse &AddUser(const SCEV *Expr,
Instruction *User, Value *Operand);
IVStrideUse &AddUser(Instruction *User, Value *Operand);
/// getReplacementExpr - Return a SCEV expression which computes the
/// value of the OperandValToReplace of the given IVStrideUse.
const SCEV *getReplacementExpr(const IVStrideUse &U) const;
const SCEV *getReplacementExpr(const IVStrideUse &IU) const;
/// getExpr - Return the expression for the use.
const SCEV *getExpr(const IVStrideUse &IU) const;
const SCEV *getStride(const IVStrideUse &IU, const Loop *L) const;
typedef ilist<IVStrideUse>::iterator iterator;
typedef ilist<IVStrideUse>::const_iterator const_iterator;

56
lib/Analysis/IVUsers.cpp
View File

@ -122,23 +122,21 @@ bool IVUsers::AddUsersIfInteresting(Instruction *I) {
if (AddUserToIVUsers) {
// Okay, we found a user that we cannot reduce.
IVUses.push_back(new IVStrideUse(this, ISE, User, I));
IVUses.push_back(new IVStrideUse(this, User, I));
IVStrideUse &NewUse = IVUses.back();
// Transform the expression into a normalized form.
NewUse.Expr =
TransformForPostIncUse(NormalizeAutodetect, NewUse.Expr,
User, I,
NewUse.PostIncLoops,
*SE, *DT);
DEBUG(dbgs() << " NORMALIZED TO: " << *NewUse.Expr << '\n');
ISE = TransformForPostIncUse(NormalizeAutodetect,
ISE, User, I,
NewUse.PostIncLoops,
*SE, *DT);
DEBUG(dbgs() << " NORMALIZED TO: " << *ISE << '\n');
}
}
return true;
}
IVStrideUse &IVUsers::AddUser(const SCEV *Expr,
Instruction *User, Value *Operand) {
IVUses.push_back(new IVStrideUse(this, Expr, User, Operand));
IVStrideUse &IVUsers::AddUser(Instruction *User, Value *Operand) {
IVUses.push_back(new IVStrideUse(this, User, Operand));
return IVUses.back();
}
@ -169,15 +167,6 @@ bool IVUsers::runOnLoop(Loop *l, LPPassManager &LPM) {
return false;
}
/// getReplacementExpr - Return a SCEV expression which computes the
/// value of the OperandValToReplace of the given IVStrideUse.
const SCEV *IVUsers::getReplacementExpr(const IVStrideUse &U) const {
PostIncLoopSet &Loops = const_cast<PostIncLoopSet &>(U.PostIncLoops);
return TransformForPostIncUse(Denormalize, U.getExpr(),
U.getUser(), U.getOperandValToReplace(),
Loops, *SE, *DT);
}
void IVUsers::print(raw_ostream &OS, const Module *M) const {
OS << "IV Users for loop ";
WriteAsOperand(OS, L->getHeader(), false);
@ -194,8 +183,7 @@ void IVUsers::print(raw_ostream &OS, const Module *M) const {
E = IVUses.end(); UI != E; ++UI) {
OS << " ";
WriteAsOperand(OS, UI->getOperandValToReplace(), false);
OS << " = "
<< *getReplacementExpr(*UI);
OS << " = " << *getReplacementExpr(*UI);
for (PostIncLoopSet::const_iterator
I = UI->PostIncLoops.begin(),
E = UI->PostIncLoops.end(); I != E; ++I) {
@ -218,6 +206,21 @@ void IVUsers::releaseMemory() {
IVUses.clear();
}
/// getReplacementExpr - Return a SCEV expression which computes the
/// value of the OperandValToReplace.
const SCEV *IVUsers::getReplacementExpr(const IVStrideUse &IU) const {
return SE->getSCEV(IU.getOperandValToReplace());
}
/// getExpr - Return the expression for the use.
const SCEV *IVUsers::getExpr(const IVStrideUse &IU) const {
return
TransformForPostIncUse(Normalize, getReplacementExpr(IU),
IU.getUser(), IU.getOperandValToReplace(),
const_cast<PostIncLoopSet &>(IU.getPostIncLoops()),
*SE, *DT);
}
static const SCEVAddRecExpr *findAddRecForLoop(const SCEV *S, const Loop *L) {
if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(S)) {
if (AR->getLoop() == L)
@ -236,18 +239,13 @@ static const SCEVAddRecExpr *findAddRecForLoop(const SCEV *S, const Loop *L) {
return 0;
}
const SCEV *IVStrideUse::getStride(const Loop *L) const {
if (const SCEVAddRecExpr *AR = findAddRecForLoop(getExpr(), L))
return AR->getStepRecurrence(*Parent->SE);
const SCEV *IVUsers::getStride(const IVStrideUse &IU, const Loop *L) const {
if (const SCEVAddRecExpr *AR = findAddRecForLoop(getExpr(IU), L))
return AR->getStepRecurrence(*SE);
return 0;
}
void IVStrideUse::transformToPostInc(const Loop *L) {
PostIncLoopSet Loops;
Loops.insert(L);
Expr = TransformForPostIncUse(Normalize, Expr,
getUser(), getOperandValToReplace(),
Loops, *Parent->SE, *Parent->DT);
PostIncLoops.insert(L);
}

11
lib/Transforms/Scalar/LoopStrengthReduce.cpp
View File

@ -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

24
test/Transforms/IndVarSimplify/eliminate-comparison.ll
View File

@ -82,3 +82,27 @@ bb20.loopexit:
%tmp.0.ph = phi i32 [ 0, %bb18 ], [ 1, %bb15 ], [ 0, %bb13 ]
ret i32 %tmp.0.ph
}
; Indvars should eliminate the icmp here.
; CHECK: @func_10
; CHECK-NOT: icmp
; CHECK: ret void
define void @func_10() nounwind {
entry:
br label %loop
loop:
%i = phi i32 [ %i.next, %loop ], [ 0, %entry ]
%t0 = icmp slt i32 %i, 0
%t1 = zext i1 %t0 to i32
%t2 = add i32 %t1, %i
%u3 = zext i32 %t2 to i64
store i64 %u3, i64* null
%i.next = add i32 %i, 1
br i1 undef, label %loop, label %return
return:
ret void
}