/// deleted and it returns the pointer to the alloca inserted.
AllocaInst *DemotePHIToStack(PHINode *P, Instruction *AllocaPoint = nullptr);
-/// If the specified pointer has an alignment that we can determine, return it,
-/// otherwise return 0. If PrefAlign is specified, and it is more than the
-/// alignment of the ultimate object, see if we can increase the alignment of
-/// the ultimate object, making this check succeed.
+/// Try to ensure that the alignment of \p V is at least \p PrefAlign bytes. If
+/// the owning object can be modified and has an alignment less than \p
+/// PrefAlign, it will be increased and \p PrefAlign returned. If the alignment
+/// cannot be increased, the known alignment of the value is returned.
+///
+/// It is not always possible to modify the alignment of the underlying object,
+/// so if alignment is important, a more reliable approach is to simply align
+/// all global variables and allocation instructions to their preferred
+/// alignment from the beginning.
unsigned getOrEnforceKnownAlignment(Value *V, unsigned PrefAlign,
const DataLayout &DL,
const Instruction *CxtI = nullptr,
return Align;
}
-/// getOrEnforceKnownAlignment - If the specified pointer has an alignment that
-/// we can determine, return it, otherwise return 0. If PrefAlign is specified,
-/// and it is more than the alignment of the ultimate object, see if we can
-/// increase the alignment of the ultimate object, making this check succeed.
unsigned llvm::getOrEnforceKnownAlignment(Value *V, unsigned PrefAlign,
const DataLayout &DL,
const Instruction *CxtI,