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[LAA] Use SCEVUse to add extra NUW flags to pointer bounds. (WIP) #91962

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[LAA] Use SCEVUse to add extra NUW flags to pointer bounds. (WIP) #91962

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7dd6d4b
[SCEV] Use const SCEV * explicitly in more places.
fhahn May 13, 2024
d660a7c
[SCEV] Introduce SCEVUse, use it instead of const SCEV * (NFCI) (WIP).
fhahn May 11, 2024
c362fe9
!fixup use raw pointer (const SCEV * + lower bits) for AddPointer.
fhahn May 13, 2024
e510400
!fix formatting
fhahn May 22, 2024
4b0c62b
!fixup compare getPointer() in HasSameVlue.
fhahn May 22, 2024
9a8305b
[SCEV,LAA] Add tests to make sure scoped SCEVs don't impact other SCEVs.
fhahn May 1, 2024
eed10c9
[SCEV] Don't require NUW at first add when checking A+C1 < (A+C2)<nuw>
fhahn May 13, 2024
c6f0b74
[LAA] Use SCEVUse to add extra NUW flags to pointer bounds.
fhahn May 12, 2024
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14 changes: 9 additions & 5 deletions llvm/include/llvm/Analysis/LoopAccessAnalysis.h
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Original file line number Diff line number Diff line change
Expand Up @@ -406,10 +406,10 @@ struct RuntimeCheckingPtrGroup {

/// The SCEV expression which represents the upper bound of all the
/// pointers in this group.
const SCEV *High;
SCEVUse High;
/// The SCEV expression which represents the lower bound of all the
/// pointers in this group.
const SCEV *Low;
SCEVUse Low;
/// Indices of all the pointers that constitute this grouping.
SmallVector<unsigned, 2> Members;
/// Address space of the involved pointers.
Expand Down Expand Up @@ -447,10 +447,10 @@ class RuntimePointerChecking {
TrackingVH<Value> PointerValue;
/// Holds the smallest byte address accessed by the pointer throughout all
/// iterations of the loop.
const SCEV *Start;
SCEVUse Start;
/// Holds the largest byte address accessed by the pointer throughout all
/// iterations of the loop, plus 1.
const SCEV *End;
SCEVUse End;
/// Holds the information if this pointer is used for writing to memory.
bool IsWritePtr;
/// Holds the id of the set of pointers that could be dependent because of a
Expand All @@ -463,7 +463,7 @@ class RuntimePointerChecking {
/// True if the pointer expressions needs to be frozen after expansion.
bool NeedsFreeze;

PointerInfo(Value *PointerValue, const SCEV *Start, const SCEV *End,
PointerInfo(Value *PointerValue, SCEVUse Start, SCEVUse End,
bool IsWritePtr, unsigned DependencySetId, unsigned AliasSetId,
const SCEV *Expr, bool NeedsFreeze)
: PointerValue(PointerValue), Start(Start), End(End),
Expand All @@ -477,8 +477,10 @@ class RuntimePointerChecking {
/// Reset the state of the pointer runtime information.
void reset() {
Need = false;
AlwaysFalse = false;
Pointers.clear();
Checks.clear();
CheckingGroups.clear();
}

/// Insert a pointer and calculate the start and end SCEVs.
Expand Down Expand Up @@ -535,6 +537,8 @@ class RuntimePointerChecking {
/// This flag indicates if we need to add the runtime check.
bool Need = false;

bool AlwaysFalse = false;

/// Information about the pointers that may require checking.
SmallVector<PointerInfo, 2> Pointers;

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