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ValueTracking: clarify isNotCrossLaneOperation (NFC) #112375

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Nov 4, 2024
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ValueTracking: clarify isNotCrossLaneOperation (NFC) #112375

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7 changes: 6 additions & 1 deletion llvm/include/llvm/Analysis/ValueTracking.h
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Original file line number Diff line number Diff line change
Expand Up @@ -791,7 +791,12 @@ bool onlyUsedByLifetimeMarkers(const Value *V);
/// droppable instructions.
bool onlyUsedByLifetimeMarkersOrDroppableInsts(const Value *V);

/// Return true if the instruction doesn't potentially cross vector lanes.
/// Return true if the instruction doesn't potentially cross vector lanes. This
/// condition is weaker than checking that the instruction is lanewise: lanewise
/// means that the same operation is splatted across all lanes, but we also
/// include the case where there is a different operation on each lane, as long
/// as the operation only uses data from that lane. An example of an operation
/// that is not lanewise, but doesn't cross vector lanes is insertelement.
bool isNotCrossLaneOperation(const Instruction *I);

/// Return true if the instruction does not have any effects besides
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