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Implement MipsSERegisterInfo::eliminateCallFramePseudoInstr. The function emits

Browse Source 
instructions that decrement and increment the stack pointer before and after a
call when the function does not have a reserved call frame.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161093 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2012-07-31 23:52:55 +00:00
parent 8589010e3d
commit 71746220d3
9 changed files with 71 additions and 41 deletions
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9
lib/Target/Mips/Mips16RegisterInfo.cpp
View File

@ -42,6 +42,15 @@ Mips16RegisterInfo::Mips16RegisterInfo(const MipsSubtarget &ST,
const TargetInstrInfo &TII)
: MipsRegisterInfo(ST, TII) {}
// This function eliminate ADJCALLSTACKDOWN,
// ADJCALLSTACKUP pseudo instructions
void Mips16RegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
// Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
MBB.erase(I);
}
void Mips16RegisterInfo::eliminateFI(MachineBasicBlock::iterator II,
unsigned OpNo, int FrameIndex,
uint64_t StackSize,

3
lib/Target/Mips/Mips16RegisterInfo.h
View File

@ -23,6 +23,9 @@ public:
Mips16RegisterInfo(const MipsSubtarget &Subtarget,
const TargetInstrInfo &TII);
void eliminateCallFramePseudoInstr(MachineFunction &MF,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const;
private:
virtual void eliminateFI(MachineBasicBlock::iterator II, unsigned OpNo,
int FrameIndex, uint64_t StackSize,

9
lib/Target/Mips/MipsRegisterInfo.cpp
View File

@ -144,15 +144,6 @@ MipsRegisterInfo::trackLivenessAfterRegAlloc(const MachineFunction &MF) const {
return true;
}
// This function eliminate ADJCALLSTACKDOWN,
// ADJCALLSTACKUP pseudo instructions
void MipsRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
// Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
MBB.erase(I);
}
// FrameIndex represent objects inside a abstract stack.
// We must replace FrameIndex with an stack/frame pointer
// direct reference.

4
lib/Target/Mips/MipsRegisterInfo.h
View File

@ -53,10 +53,6 @@ public:
virtual bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const;
void eliminateCallFramePseudoInstr(MachineFunction &MF,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const;
/// Stack Frame Processing Methods
void eliminateFrameIndex(MachineBasicBlock::iterator II,
int SPAdj, RegScavenger *RS = NULL) const;

34
lib/Target/Mips/MipsSEFrameLowering.cpp
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@ -13,7 +13,7 @@
#include "MipsSEFrameLowering.h"
#include "MipsAnalyzeImmediate.h"
#include "MipsInstrInfo.h"
#include "MipsSEInstrInfo.h"
#include "MipsMachineFunction.h"
#include "MCTargetDesc/MipsBaseInfo.h"
#include "llvm/Function.h"
@ -33,15 +33,14 @@ void MipsSEFrameLowering::emitPrologue(MachineFunction &MF) const {
MachineFrameInfo *MFI = MF.getFrameInfo();
const MipsRegisterInfo *RegInfo =
static_cast<const MipsRegisterInfo*>(MF.getTarget().getRegisterInfo());
const MipsInstrInfo &TII =
*static_cast<const MipsInstrInfo*>(MF.getTarget().getInstrInfo());
const MipsSEInstrInfo &TII =
*static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo());
MachineBasicBlock::iterator MBBI = MBB.begin();
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
unsigned SP = STI.isABI_N64() ? Mips::SP_64 : Mips::SP;
unsigned FP = STI.isABI_N64() ? Mips::FP_64 : Mips::FP;
unsigned ZERO = STI.isABI_N64() ? Mips::ZERO_64 : Mips::ZERO;
unsigned ADDu = STI.isABI_N64() ? Mips::DADDu : Mips::ADDu;
unsigned ADDiu = STI.isABI_N64() ? Mips::DADDiu : Mips::ADDiu;
// First, compute final stack size.
uint64_t StackSize = MFI->getStackSize();
@ -54,16 +53,7 @@ void MipsSEFrameLowering::emitPrologue(MachineFunction &MF) const {
MachineLocation DstML, SrcML;
// Adjust stack.
if (isInt<16>(-StackSize))// addi sp, sp, (-stacksize)
BuildMI(MBB, MBBI, dl, TII.get(ADDiu), SP).addReg(SP).addImm(-StackSize);
else { // Expand immediate that doesn't fit in 16-bit.
unsigned ATReg = STI.isABI_N64() ? Mips::AT_64 : Mips::AT;
MF.getInfo<MipsFunctionInfo>()->setEmitNOAT();
Mips::loadImmediate(-StackSize, STI.isABI_N64(), TII, MBB, MBBI, dl, false,
0);
BuildMI(MBB, MBBI, dl, TII.get(ADDu), SP).addReg(SP).addReg(ATReg);
}
TII.adjustStackPtr(SP, -StackSize, MBB, MBBI);
// emit ".cfi_def_cfa_offset StackSize"
MCSymbol *AdjustSPLabel = MMI.getContext().CreateTempSymbol();
@ -133,14 +123,13 @@ void MipsSEFrameLowering::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
MachineFrameInfo *MFI = MF.getFrameInfo();
const MipsInstrInfo &TII =
*static_cast<const MipsInstrInfo*>(MF.getTarget().getInstrInfo());
const MipsSEInstrInfo &TII =
*static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo());
DebugLoc dl = MBBI->getDebugLoc();
unsigned SP = STI.isABI_N64() ? Mips::SP_64 : Mips::SP;
unsigned FP = STI.isABI_N64() ? Mips::FP_64 : Mips::FP;
unsigned ZERO = STI.isABI_N64() ? Mips::ZERO_64 : Mips::ZERO;
unsigned ADDu = STI.isABI_N64() ? Mips::DADDu : Mips::ADDu;
unsigned ADDiu = STI.isABI_N64() ? Mips::DADDiu : Mips::ADDiu;
// if framepointer enabled, restore the stack pointer.
if (hasFP(MF)) {
@ -161,16 +150,7 @@ void MipsSEFrameLowering::emitEpilogue(MachineFunction &MF,
return;
// Adjust stack.
if (isInt<16>(StackSize)) // addi sp, sp, (-stacksize)
BuildMI(MBB, MBBI, dl, TII.get(ADDiu), SP).addReg(SP).addImm(StackSize);
else { // Expand immediate that doesn't fit in 16-bit.
unsigned ATReg = STI.isABI_N64() ? Mips::AT_64 : Mips::AT;
MF.getInfo<MipsFunctionInfo>()->setEmitNOAT();
Mips::loadImmediate(StackSize, STI.isABI_N64(), TII, MBB, MBBI, dl, false,
0);
BuildMI(MBB, MBBI, dl, TII.get(ADDu), SP).addReg(SP).addReg(ATReg);
}
TII.adjustStackPtr(SP, StackSize, MBB, MBBI);
}
bool MipsSEFrameLowering::

20
lib/Target/Mips/MipsSEInstrInfo.cpp
View File

@ -248,6 +248,26 @@ unsigned MipsSEInstrInfo::GetOppositeBranchOpc(unsigned Opc) const {
}
}
/// Adjust SP by Amount bytes.
void MipsSEInstrInfo::adjustStackPtr(unsigned SP, int64_t Amount,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
const MipsSubtarget &STI = TM.getSubtarget<MipsSubtarget>();
DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc();
unsigned ADDu = STI.isABI_N64() ? Mips::DADDu : Mips::ADDu;
unsigned ADDiu = STI.isABI_N64() ? Mips::DADDiu : Mips::ADDiu;
if (isInt<16>(Amount))// addi sp, sp, amount
BuildMI(MBB, I, DL, get(ADDiu), SP).addReg(SP).addImm(Amount);
else { // Expand immediate that doesn't fit in 16-bit.
unsigned ATReg = STI.isABI_N64() ? Mips::AT_64 : Mips::AT;
MBB.getParent()->getInfo<MipsFunctionInfo>()->setEmitNOAT();
Mips::loadImmediate(Amount, STI.isABI_N64(), *this, MBB, I, DL, false, 0);
BuildMI(MBB, I, DL, get(ADDu), SP).addReg(SP).addReg(ATReg);
}
}
unsigned MipsSEInstrInfo::GetAnalyzableBrOpc(unsigned Opc) const {
return (Opc == Mips::BEQ || Opc == Mips::BNE || Opc == Mips::BGTZ ||
Opc == Mips::BGEZ || Opc == Mips::BLTZ || Opc == Mips::BLEZ ||

4
lib/Target/Mips/MipsSEInstrInfo.h
View File

@ -66,6 +66,10 @@ public:
virtual unsigned GetOppositeBranchOpc(unsigned Opc) const;
/// Adjust SP by Amount bytes.
void adjustStackPtr(unsigned SP, int64_t Amount, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const;
private:
virtual unsigned GetAnalyzableBrOpc(unsigned Opc) const;

25
lib/Target/Mips/MipsSERegisterInfo.cpp
View File

@ -15,7 +15,7 @@
#include "MipsSERegisterInfo.h"
#include "Mips.h"
#include "MipsAnalyzeImmediate.h"
#include "MipsInstrInfo.h"
#include "MipsSEInstrInfo.h"
#include "MipsSubtarget.h"
#include "MipsMachineFunction.h"
#include "llvm/Constants.h"
@ -43,6 +43,29 @@ MipsSERegisterInfo::MipsSERegisterInfo(const MipsSubtarget &ST,
const TargetInstrInfo &TII)
: MipsRegisterInfo(ST, TII) {}
// This function eliminate ADJCALLSTACKDOWN,
// ADJCALLSTACKUP pseudo instructions
void MipsSERegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
if (!TFI->hasReservedCallFrame(MF)) {
DebugLoc DL = I->getDebugLoc();
int64_t Amount = I->getOperand(0).getImm();
if (I->getOpcode() == Mips::ADJCALLSTACKDOWN)
Amount = -Amount;
const MipsSEInstrInfo *II = static_cast<const MipsSEInstrInfo*>(&TII);
unsigned SP = Subtarget.isABI_N64() ? Mips::SP_64 : Mips::SP;
II->adjustStackPtr(SP, Amount, MBB, I);
}
MBB.erase(I);
}
void MipsSERegisterInfo::eliminateFI(MachineBasicBlock::iterator II,
unsigned OpNo, int FrameIndex,
uint64_t StackSize,

4
lib/Target/Mips/MipsSERegisterInfo.h
View File

@ -24,6 +24,10 @@ public:
MipsSERegisterInfo(const MipsSubtarget &Subtarget,
const TargetInstrInfo &TII);
void eliminateCallFramePseudoInstr(MachineFunction &MF,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const;
private:
virtual void eliminateFI(MachineBasicBlock::iterator II, unsigned OpNo,
int FrameIndex, uint64_t StackSize,