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Insert instructions that copy $sp to or from $fp at the right locations.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131784 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2011-05-21 02:29:26 +00:00
parent 424b777171
commit f346c69530
1 changed files with 26 additions and 11 deletions
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37
lib/Target/Mips/MipsFrameLowering.cpp
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@ -244,9 +244,6 @@ void MipsFrameLowering::emitPrologue(MachineFunction &MF) const {
// Get the number of bytes to allocate from the FrameInfo.
unsigned StackSize = MFI->getStackSize();
// No need to allocate space on the stack.
if (StackSize == 0 && !MFI->adjustsStack()) return;
BuildMI(MBB, MBBI, dl, TII.get(Mips::NOREORDER));
// TODO: check need from GP here.
@ -255,6 +252,9 @@ void MipsFrameLowering::emitPrologue(MachineFunction &MF) const {
.addReg(RegInfo->getPICCallReg());
BuildMI(MBB, MBBI, dl, TII.get(Mips::NOMACRO));
// No need to allocate space on the stack.
if (StackSize == 0 && !MFI->adjustsStack()) return;
// Adjust stack : addi sp, sp, (-imm)
ATUsed = expandRegLargeImmPair(Mips::SP, -StackSize, NewReg, NewImm, MBB,
MBBI);
@ -266,10 +266,18 @@ void MipsFrameLowering::emitPrologue(MachineFunction &MF) const {
BuildMI(MBB, MBBI, dl, TII.get(Mips::ATMACRO));
// if framepointer enabled, set it to point to the stack pointer.
if (hasFP(MF))
// move $fp, $sp
if (hasFP(MF)) {
// Find the instruction past the last instruction that saves a callee-saved
// register to the stack.
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
for (unsigned i = 0; i < CSI.size(); ++i)
++MBBI;
// Insert instruction "move $fp, $sp" at this location.
BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDu), Mips::FP)
.addReg(Mips::SP).addReg(Mips::ZERO);
}
// Restore GP from the saved stack location
if (MipsFI->needGPSaveRestore())
@ -286,21 +294,28 @@ void MipsFrameLowering::emitEpilogue(MachineFunction &MF,
DebugLoc dl = MBBI->getDebugLoc();
// Get the number of bytes from FrameInfo
int NumBytes = (int) MFI->getStackSize();
unsigned StackSize = MFI->getStackSize();
unsigned NewReg = 0;
int NewImm = 0;
bool ATUsed = false;
// if framepointer enabled, restore the stack pointer.
if (hasFP(MF))
// move $sp, $fp
BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDu), Mips::SP)
if (hasFP(MF)) {
// Find the first instruction that restores a callee-saved register.
MachineBasicBlock::iterator I = MBBI;
for (unsigned i = 0; i < MFI->getCalleeSavedInfo().size(); ++i)
--I;
// Insert instruction "move $sp, $fp" at this location.
BuildMI(MBB, I, dl, TII.get(Mips::ADDu), Mips::SP)
.addReg(Mips::FP).addReg(Mips::ZERO);
}
// adjust stack : insert addi sp, sp, (imm)
if (NumBytes) {
ATUsed = expandRegLargeImmPair(Mips::SP, NumBytes, NewReg, NewImm, MBB,
if (StackSize) {
ATUsed = expandRegLargeImmPair(Mips::SP, StackSize, NewReg, NewImm, MBB,
MBBI);
BuildMI(MBB, MBBI, dl, TII.get(Mips::ADDiu), Mips::SP)
.addReg(NewReg).addImm(NewImm);