X86VZeroUpper.cpp File Reference

#include "X86.h"
#include "X86InstrInfo.h"
#include "X86Subtarget.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "x86-vzeroupper"

Functions
	STATISTIC (NumVZU, "Number of vzeroupper instructions inserted")
static bool	isYmmOrZmmReg (unsigned Reg)
	VZEROUPPER cleans state that is related to Y/ZMM0-15 only.
static bool	checkFnHasLiveInYmmOrZmm (MachineRegisterInfo &MRI)
static bool	clobbersAllYmmAndZmmRegs (const MachineOperand &MO)
static bool	hasYmmOrZmmReg (MachineInstr &MI)
static bool	callHasRegMask (MachineInstr &MI)
	Check if given call instruction has a RegMask operand.

Variables
static cl::opt< bool >	UseVZeroUpper ("x86-use-vzeroupper", cl::Hidden, cl::desc("Minimize AVX to SSE transition penalty"), cl::init(true))

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "x86-vzeroupper"

Definition at line 40 of file X86VZeroUpper.cpp.

Function Documentation

callHasRegMask()

static bool callHasRegMask ( MachineInstr &  MI )

static

Check if given call instruction has a RegMask operand.

Definition at line 173 of file X86VZeroUpper.cpp.

References assert(), and MI.

checkFnHasLiveInYmmOrZmm()

static bool checkFnHasLiveInYmmOrZmm ( MachineRegisterInfo &  MRI )

static

Definition at line 138 of file X86VZeroUpper.cpp.

References isYmmOrZmmReg(), and MRI.

clobbersAllYmmAndZmmRegs()

static bool clobbersAllYmmAndZmmRegs ( const MachineOperand &  MO )

static

Definition at line 146 of file X86VZeroUpper.cpp.

References llvm::MachineOperand::clobbersPhysReg().

Referenced by hasYmmOrZmmReg().

hasYmmOrZmmReg()

static bool hasYmmOrZmmReg ( MachineInstr &  MI )

static

Definition at line 158 of file X86VZeroUpper.cpp.

References clobbersAllYmmAndZmmRegs(), isYmmOrZmmReg(), and MI.

isYmmOrZmmReg()

static bool isYmmOrZmmReg ( unsigned  Reg )

static

VZEROUPPER cleans state that is related to Y/ZMM0-15 only.

Thus, there is no need to check for Y/ZMM16 and above.

Definition at line 133 of file X86VZeroUpper.cpp.

Referenced by checkFnHasLiveInYmmOrZmm(), and hasYmmOrZmmReg().

STATISTIC()

STATISTIC	(	NumVZU	,
		"Number of vzeroupper instructions inserted"
	)

Variable Documentation

UseVZeroUpper

cl::opt< bool > UseVZeroUpper("x86-use-vzeroupper", cl::Hidden, cl::desc("Minimize AVX to SSE transition penalty"), cl::init(true)) ( "x86-use-vzeroupper"  , cl::Hidden  , cl::desc("Minimize AVX to SSE transition penalty")  , cl::init(true)    )

static