This file implements a virtual register coloring pass. More...

#include "WebAssembly.h"
#include "WebAssemblyMachineFunctionInfo.h"
#include "llvm/CodeGen/LiveIntervals.h"
#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"

Include dependency graph for WebAssemblyRegColoring.cpp:

Go to the source code of this file.

Macros
#define	DEBUG_TYPE "wasm-reg-coloring"

Functions
	INITIALIZE_PASS (WebAssemblyRegColoring, DEBUG_TYPE, "Minimize number of registers used", false, false) FunctionPass *llvm

static float	computeWeight (const MachineRegisterInfo MRI, const MachineBlockFrequencyInfo MBFI, unsigned VReg)

Detailed Description

This file implements a virtual register coloring pass.

WebAssembly doesn't have a fixed number of registers, but it is still desirable to minimize the total number of registers used in each function.

This code is modeled after lib/CodeGen/StackSlotColoring.cpp.

Definition in file WebAssemblyRegColoring.cpp.

Macro Definition Documentation

◆ DEBUG_TYPE

#define DEBUG_TYPE "wasm-reg-coloring"

Definition at line 30 of file WebAssemblyRegColoring.cpp.

Function Documentation

◆ computeWeight()

static float computeWeight	(	const MachineRegisterInfo *	MRI,
		const MachineBlockFrequencyInfo *	MBFI,
		unsigned	VReg
	)

static

Definition at line 66 of file WebAssemblyRegColoring.cpp.

References assert(), C, llvm::dbgs(), llvm::LiveInterval::dump(), llvm::LiveRange::empty(), llvm::MachineFunction::exposesReturnsTwice(), llvm::MachineFunction::getInfo(), llvm::LiveIntervals::getInterval(), llvm::MachineFunction::getName(), llvm::MachineRegisterInfo::getNumVirtRegs(), llvm::MachineRegisterInfo::getRegClass(), llvm::MachineFunction::getRegInfo(), llvm::LiveIntervals::getSpillWeight(), llvm::TargetRegisterInfo::index2VirtReg(), llvm::MachineRegisterInfo::isLiveIn(), LLVM_DEBUG, MRI, llvm::SmallVectorTemplateBase< T >::push_back(), llvm::LiveInterval::reg, llvm::MachineRegisterInfo::reg_nodbg_operands(), llvm::MachineRegisterInfo::replaceRegWith(), llvm::SmallVectorImpl< T >::reserve(), llvm::SmallVectorBase::size(), llvm::sort(), llvm::MachineRegisterInfo::use_empty(), llvm::TargetRegisterInfo::virtReg2Index(), and llvm::LiveInterval::weight.

◆ INITIALIZE_PASS()

INITIALIZE_PASS	(	WebAssemblyRegColoring	,
		DEBUG_TYPE	,
		"Minimize number of registers used"	,
		false	,
		false
	)

Definition at line 58 of file WebAssemblyRegColoring.cpp.