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/LibcallLoweringInfo.h"
#include "llvm/CodeGen/MachineFunctionAnalysisManager.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachinePassManager.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/Analysis.h"
#include "llvm/Support/ErrorHandling.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "wasm-peephole"

Functions
	INITIALIZE_PASS (WebAssemblyPeepholeLegacy, 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)
static bool	peephole (MachineFunction &MF, TargetLibraryInfo &LibInfo, const LibcallLoweringInfo &LibcallLowering)

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 30 of file WebAssemblyPeephole.cpp.

Function Documentation

INITIALIZE_PASS()

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

Definition at line 59 of file WebAssemblyPeephole.cpp.

References llvm::createWebAssemblyPeepholeLegacyPass(), and DEBUG_TYPE.

maybeRewriteToDrop()

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

static

If desirable, rewrite NewReg to a drop register.

Definition at line 67 of file WebAssemblyPeephole.cpp.

References Changed, llvm::MachineRegisterInfo::createVirtualRegister(), llvm::MachineRegisterInfo::getRegClass(), llvm::MachineOperand::setIsDead(), llvm::MachineOperand::setReg(), and llvm::WebAssemblyFunctionInfo::stackifyVReg().

Referenced by peephole().

maybeRewriteToFallthrough()

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

static

Definition at line 81 of file WebAssemblyPeephole.cpp.

References llvm::MachineInstrBuilder::addReg(), assert(), llvm::MachineFunction::back(), llvm::BuildMI(), llvm::MachineRegisterInfo::createVirtualRegister(), DisableWebAssemblyFallthroughReturnOpt, llvm::WebAssembly::getCopyOpcodeForRegClass(), llvm::MachineRegisterInfo::getRegClass(), llvm::WebAssemblyFunctionInfo::isVRegStackified(), MBB, MI, Reg, llvm::WebAssemblyFunctionInfo::stackifyVReg(), and TII.

Referenced by peephole().

peephole()

bool peephole ( MachineFunction & MF, TargetLibraryInfo & LibInfo, const LibcallLoweringInfo & LibcallLowering )

static

Definition at line 118 of file WebAssemblyPeephole.cpp.

References Changed, llvm::dbgs(), llvm::MachineFunction::getInfo(), llvm::LibcallLoweringInfo::getLibcallImpl(), llvm::RTLIB::RuntimeLibcallsInfo::getLibcallImplName(), llvm::TargetLibraryInfo::getLibFunc(), llvm::MachineFunction::getName(), llvm::MachineOperand::getReg(), llvm::MachineFunction::getRegInfo(), llvm::MachineFunction::getSubtarget(), llvm::MachineOperand::getSymbolName(), llvm::MachineOperand::isSymbol(), LLVM_DEBUG, maybeRewriteToDrop(), maybeRewriteToFallthrough(), MBB, MI, llvm::report_fatal_error(), and TII.

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

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().