DXILCBufferAccess.cpp File Reference

#include "DXILCBufferAccess.h"
#include "DirectX.h"
#include "llvm/Frontend/HLSL/CBuffer.h"
#include "llvm/Frontend/HLSL/HLSLResource.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/IntrinsicsDirectX.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Transforms/Utils/Local.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "dxil-cbuffer-access"

Functions
static void	replaceLoad (LoadInst *LI, CBufferResource &CBR, SmallVectorImpl< WeakTrackingVH > &DeadInsts)
	Replace load via cbuffer global with a load from the cbuffer handle itself.
static void	copyArrayElemsForMemCpy (IRBuilder<> &Builder, MemCpyInst *MCI, CBufferResource &CBR, ArrayType *ArrTy, size_t ArrOffset, size_t N, const Twine &Name="")
	This function recursively copies N array elements from the cbuffer resource CBR to the MemCpy Destination.
static void	replaceMemCpy (MemCpyInst *MCI, CBufferResource &CBR)
	Replace memcpy from a cbuffer global with a memcpy from the cbuffer handle itself.
static void	replaceAccessesWithHandle (CBufferResource &CBR)
static bool	replaceCBufferAccesses (Module &M)
	INITIALIZE_PASS (DXILCBufferAccessLegacy, DEBUG_TYPE, "DXIL CBuffer Access", false, false) ModulePass *llvm

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "dxil-cbuffer-access"

Definition at line 21 of file DXILCBufferAccess.cpp.

Function Documentation

copyArrayElemsForMemCpy()

static void copyArrayElemsForMemCpy ( IRBuilder<> &  Builder, MemCpyInst *  MCI, CBufferResource &  CBR, ArrayType *  ArrTy, size_t  ArrOffset, size_t  N, const Twine &  Name = ""  )

static

This function recursively copies N array elements from the cbuffer resource CBR to the MemCpy Destination.

Recursion is used to unravel multidimensional arrays into a sequence of scalar/vector extracts and stores.

Definition at line 200 of file DXILCBufferAccess.cpp.

References copyArrayElemsForMemCpy(), llvm::IRBuilderBase::CreateInBoundsGEP(), llvm::IRBuilderBase::CreateStore(), DL, GEP, llvm::Instruction::getDataLayout(), llvm::MemIntrinsicBase< Derived >::getDest(), llvm::IRBuilderBase::getInt8Ty(), llvm::MemTransferBase< BaseCL >::getSource(), llvm::Value::getType(), llvm::APInt::getZExtValue(), I, llvm::MemIntrinsic::isVolatile(), N, Name, llvm::Offset, and llvm::hlsl::translateCBufArrayOffset().

Referenced by copyArrayElemsForMemCpy(), and replaceMemCpy().

INITIALIZE_PASS()

INITIALIZE_PASS	(	DXILCBufferAccessLegacy	,
		DEBUG_TYPE	,
		"DXIL CBuffer Access"	,
		false	,
		false
	)

Definition at line 341 of file DXILCBufferAccess.cpp.

replaceAccessesWithHandle()

static void replaceAccessesWithHandle ( CBufferResource &  CBR )

static

Definition at line 273 of file DXILCBufferAccess.cpp.

References llvm_unreachable, llvm::RecursivelyDeleteTriviallyDeadInstructions(), replaceLoad(), replaceMemCpy(), llvm::Value::user_begin(), and llvm::Value::user_end().

Referenced by replaceCBufferAccesses().

replaceCBufferAccesses()

static bool replaceCBufferAccesses ( Module &  M )

static

Definition at line 304 of file DXILCBufferAccess.cpp.

References llvm::hlsl::CBufferMetadata::get(), and replaceAccessesWithHandle().

Referenced by llvm::DXILCBufferAccess::run().

replaceLoad()

static void replaceLoad ( LoadInst *  LI, CBufferResource &  CBR, SmallVectorImpl< WeakTrackingVH > &  DeadInsts  )

static

Replace load via cbuffer global with a load from the cbuffer handle itself.

Definition at line 187 of file DXILCBufferAccess.cpp.

References llvm::Value::getName(), llvm::LoadInst::getPointerOperand(), llvm::Value::getType(), llvm::Offset, llvm::SmallVectorTemplateBase< T, bool >::push_back(), and llvm::Value::replaceAllUsesWith().

Referenced by replaceAccessesWithHandle().

replaceMemCpy()

static void replaceMemCpy ( MemCpyInst *  MCI, CBufferResource &  CBR  )

static

Replace memcpy from a cbuffer global with a memcpy from the cbuffer handle itself.

Assumes the cbuffer global is an array, and the length of bytes to copy is divisible by array element allocation size. The memcpy source must also be a direct cbuffer global reference, not a GEP.

Definition at line 235 of file DXILCBufferAccess.cpp.

References assert(), copyArrayElemsForMemCpy(), DL, llvm::Instruction::eraseFromParent(), llvm::MemIntrinsicBase< Derived >::getDest(), llvm::MemIntrinsicBase< Derived >::getLength(), llvm::Value::getName(), llvm::MemTransferBase< BaseCL >::getSource(), llvm::Length, and llvm::reportFatalUsageError().

Referenced by replaceAccessesWithHandle().