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Implement MipsSERegisterInfo::eliminateCallFramePseudoInstr. The function emits

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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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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::