WebAssemblyPeephole.cpp File Reference

Late peephole optimizations for WebAssembly. More...

#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
#include "WebAssembly.h"
#include "WebAssemblyMachineFunctionInfo.h"
#include "WebAssemblySubtarget.h"
#include "WebAssemblyUtilities.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "wasm-peephole"

Functions
	INITIALIZE_PASS (WebAssemblyPeephole, DEBUG_TYPE, "WebAssembly peephole optimizations", false, false) FunctionPass *llvm
static bool	maybeRewriteToDrop (unsigned OldReg, unsigned NewReg, MachineOperand &MO, WebAssemblyFunctionInfo &MFI, MachineRegisterInfo &MRI)
	If desirable, rewrite NewReg to a drop register.
static bool	maybeRewriteToFallthrough (MachineInstr &MI, MachineBasicBlock &MBB, const MachineFunction &MF, WebAssemblyFunctionInfo &MFI, MachineRegisterInfo &MRI, const WebAssemblyInstrInfo &TII)

Variables
static cl::opt< bool >	DisableWebAssemblyFallthroughReturnOpt ("disable-wasm-fallthrough-return-opt", cl::Hidden, cl::desc("WebAssembly: Disable fallthrough-return optimizations."), cl::init(false))

Detailed Description

Late peephole optimizations for WebAssembly.

Definition in file WebAssemblyPeephole.cpp.

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "wasm-peephole"

Definition at line 25 of file WebAssemblyPeephole.cpp.

Function Documentation

INITIALIZE_PASS()

INITIALIZE_PASS	(	WebAssemblyPeephole	,
		DEBUG_TYPE	,
		"WebAssembly peephole optimizations"	,
		false	,
		false
	)

Definition at line 53 of file WebAssemblyPeephole.cpp.

maybeRewriteToDrop()

static bool maybeRewriteToDrop ( unsigned  OldReg, unsigned  NewReg, MachineOperand &  MO, WebAssemblyFunctionInfo &  MFI, MachineRegisterInfo &  MRI  )

static

If desirable, rewrite NewReg to a drop register.

Definition at line 61 of file WebAssemblyPeephole.cpp.

References MRI, llvm::MachineOperand::setIsDead(), llvm::MachineOperand::setReg(), and llvm::WebAssemblyFunctionInfo::stackifyVReg().

maybeRewriteToFallthrough()

static bool maybeRewriteToFallthrough ( MachineInstr &  MI, MachineBasicBlock &  MBB, const MachineFunction &  MF, WebAssemblyFunctionInfo &  MFI, MachineRegisterInfo &  MRI, const WebAssemblyInstrInfo &  TII  )

static

Definition at line 75 of file WebAssemblyPeephole.cpp.

References llvm::MachineInstrBuilder::addReg(), assert(), llvm::MachineFunction::back(), llvm::BuildMI(), DisableWebAssemblyFallthroughReturnOpt, llvm::MachineBasicBlock::end(), End, llvm::WebAssembly::getCopyOpcodeForRegClass(), llvm::WebAssemblyFunctionInfo::isVRegStackified(), MBB, MI, MRI, llvm::WebAssemblyFunctionInfo::stackifyVReg(), and TII.

Variable Documentation

DisableWebAssemblyFallthroughReturnOpt

cl::opt< bool > DisableWebAssemblyFallthroughReturnOpt("disable-wasm-fallthrough-return-opt", cl::Hidden, cl::desc("WebAssembly: Disable fallthrough-return optimizations."), cl::init(false)) ( "disable-wasm-fallthrough-return-opt"  , cl::Hidden  , cl::desc("WebAssembly: Disable fallthrough-return optimizations.")  , cl::init(false)    )

static

Referenced by maybeRewriteToFallthrough().