[#llvm-getStartAndEndForAccess-09]
= xref:llvm.adoc[llvm]::getStartAndEndForAccess
:relfileprefix: ../
:mrdocs:

Overload of getStartAndEndForAccess taking the element size as a SCEV.

== Synopsis

Declared in `<llvm/Analysis/LoopAccessAnalysis.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::pair<SCEV const*, SCEV const*>
getStartAndEndForAccess(
    xref:llvm/Loop.adoc[Loop] const* Lp,
    xref:llvm/SCEV.adoc[SCEV] const* PtrExpr,
    xref:llvm/SCEV.adoc[SCEV] const* EltSizeSCEV,
    xref:llvm/SCEV.adoc[SCEV] const* BTC,
    xref:llvm/SCEV.adoc[SCEV] const* MaxBTC,
    xref:llvm/ScalarEvolution.adoc[ScalarEvolution]* SE,
    xref:llvm/DenseMap-0c.adoc[DenseMap<std::pair<SCEV const*, SCEV const*>, std::pair<SCEV const*, SCEV const*>>]* PointerBounds,
    xref:llvm/DominatorTree.adoc[DominatorTree]* DT,
    xref:llvm/AssumptionCache.adoc[AssumptionCache]* AC,
    std::optional<ScalarEvolution::LoopGuards>& LoopGuards);
----

== Return Value

The start and end SCEVs of the accessed memory region.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *Lp*
| Loop in which the access executes.
| *PtrExpr*
| SCEV for the pointer being accessed.
| *EltSizeSCEV*
| SCEV for the access size in bytes.
| *BTC*
| Exact backedge‐taken count when available.
| *MaxBTC*
| Maximum backedge‐taken count used as a fallback.
| *SE*
| ScalarEvolution used to compute start and end expressions.
| *PointerBounds*
| Optional cache of previously computed bounds.
| *DT*
| Dominator tree used for context‐sensitive reasoning.
| *AC*
| Assumption cache used to strengthen proofs.
| *LoopGuards*
| Cached loop guards used while computing bounds.
|===


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