#include "llvm/Transforms/Utils/VNCoercion.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/IntrinsicInst.h"

Macros
#define	DEBUG_TYPE "vncoerce"

Functions
static bool	isFirstClassAggregateOrScalableType (Type *Ty)
static int	analyzeLoadFromClobberingWrite (Type LoadTy, Value LoadPtr, Value *WritePtr, uint64_t WriteSizeInBits, const DataLayout &DL)
	This function is called when we have a memdep query of a load that ends up being a clobbering memory write (store, memset, memcpy, memmove).
static Value *	getStoreValueForLoadHelper (Value SrcVal, unsigned Offset, Type LoadTy, IRBuilderBase &Builder, const DataLayout &DL)

Macro Definition Documentation

◆ DEBUG_TYPE

#define DEBUG_TYPE "vncoerce"

Definition at line 7 of file VNCoercion.cpp.

Function Documentation

◆ analyzeLoadFromClobberingWrite()

int analyzeLoadFromClobberingWrite	(	Type *	LoadTy,
		Value *	LoadPtr,
		Value *	WritePtr,
		uint64_t	WriteSizeInBits,
		const DataLayout &	DL )

static

This function is called when we have a memdep query of a load that ends up being a clobbering memory write (store, memset, memcpy, memmove).

This means that the write may provide bits used by the load but we can't be sure because the pointers don't must-alias.

Check this case to see if there is anything more we can do before we give up. This returns -1 if we have to give up, or a byte number in the stored value of the piece that feeds the load.

Definition at line 198 of file VNCoercion.cpp.

References DL, llvm::GetPointerBaseWithConstantOffset(), and isFirstClassAggregateOrScalableType().

Referenced by llvm::VNCoercion::analyzeLoadFromClobberingLoad(), llvm::VNCoercion::analyzeLoadFromClobberingMemInst(), and llvm::VNCoercion::analyzeLoadFromClobberingStore().