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clean up prolouge and epilouge

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22346 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Lenharth
2005-07-07 19:52:58 +00:00
parent c7f083297c
commit a48f3ce18a
2 changed files with 39 additions and 28 deletions
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51
lib/Target/Alpha/AlphaRegisterInfo.cpp
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@@ -224,15 +224,12 @@ void AlphaRegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
MachineInstr *MI;
bool FP = hasFP(MF);
//handle GOP offset
MI = BuildMI(Alpha::LDGP, 0);
MBB.insert(MBBI, MI);
BuildMI(MBB, MBBI, Alpha::LDGP, 0);
//evil const_cast until MO stuff setup to handle const
MI = BuildMI(Alpha::ALTENT, 1).addGlobalAddress(const_cast<Function*>(MF.getFunction()), true);
MBB.insert(MBBI, MI);
BuildMI(MBB, MBBI, Alpha::ALTENT, 1).addGlobalAddress(const_cast<Function*>(MF.getFunction()), true);
// Get the number of bytes to allocate from the FrameInfo
long NumBytes = MFI->getStackSize();
@@ -259,13 +256,13 @@ void AlphaRegisterInfo::emitPrologue(MachineFunction &MF) const {
// adjust stack pointer: r30 -= numbytes
NumBytes = -NumBytes;
if (NumBytes >= IMM_LOW) {
MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(NumBytes).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
BuildMI(MBB, MBBI, Alpha::LDA, 2, Alpha::R30).addImm(NumBytes)
.addReg(Alpha::R30);
} else if (getUpper16(NumBytes) >= IMM_LOW) {
MI=BuildMI(Alpha::LDAH, 2, Alpha::R30).addImm(getUpper16(NumBytes)).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(getLower16(NumBytes)).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
BuildMI(MBB, MBBI, Alpha::LDAH, 2, Alpha::R30).addImm(getUpper16(NumBytes))
.addReg(Alpha::R30);
BuildMI(MBB, MBBI, Alpha::LDA, 2, Alpha::R30).addImm(getLower16(NumBytes))
.addReg(Alpha::R30);
} else {
std::cerr << "Too big a stack frame at " << NumBytes << "\n";
abort();
@@ -274,11 +271,12 @@ void AlphaRegisterInfo::emitPrologue(MachineFunction &MF) const {
//now if we need to, save the old FP and set the new
if (FP)
{
MI=BuildMI(Alpha::STQ, 3).addReg(Alpha::R15).addImm(0).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
if (EnableAlphaLSMark)
BuildMI(MBB, MBBI, Alpha::MEMLABEL, 4).addImm(4).addImm(0).addImm(1)
.addImm(getUID());
BuildMI(MBB, MBBI, Alpha::STQ, 3).addReg(Alpha::R15).addImm(0).addReg(Alpha::R30);
//this must be the last instr in the prolog
MI=BuildMI(Alpha::BIS, 2, Alpha::R15).addReg(Alpha::R30).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
BuildMI(MBB, MBBI, Alpha::BIS, 2, Alpha::R15).addReg(Alpha::R30).addReg(Alpha::R30);
}
}
@@ -287,7 +285,6 @@ void AlphaRegisterInfo::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
MachineBasicBlock::iterator MBBI = prior(MBB.end());
MachineInstr *MI;
assert((MBBI->getOpcode() == Alpha::RET)
&& "Can only insert epilog into returning blocks");
@@ -300,23 +297,25 @@ void AlphaRegisterInfo::emitEpilogue(MachineFunction &MF,
if (FP)
{
//copy the FP into the SP (discards allocas)
MI=BuildMI(Alpha::BIS, 2, Alpha::R30).addReg(Alpha::R15).addReg(Alpha::R15);
MBB.insert(MBBI, MI);
BuildMI(MBB, MBBI, Alpha::BIS, 2, Alpha::R30).addReg(Alpha::R15)
.addReg(Alpha::R15);
//restore the FP
MI=BuildMI(Alpha::LDQ, 2, Alpha::R15).addImm(0).addReg(Alpha::R15);
MBB.insert(MBBI, MI);
if (EnableAlphaLSMark)
BuildMI(MBB, MBBI, Alpha::MEMLABEL, 4).addImm(4).addImm(0).addImm(2)
.addImm(getUID());
BuildMI(MBB, MBBI, Alpha::LDQ, 2, Alpha::R15).addImm(0).addReg(Alpha::R15);
}
if (NumBytes != 0)
{
if (NumBytes <= IMM_HIGH) {
MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(NumBytes).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
BuildMI(MBB, MBBI, Alpha::LDA, 2, Alpha::R30).addImm(NumBytes)
.addReg(Alpha::R30);
} else if (getUpper16(NumBytes) <= IMM_HIGH) {
MI=BuildMI(Alpha::LDAH, 2, Alpha::R30).addImm(getUpper16(NumBytes)).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(getLower16(NumBytes)).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
BuildMI(MBB, MBBI, Alpha::LDAH, 2, Alpha::R30)
.addImm(getUpper16(NumBytes)).addReg(Alpha::R30);
BuildMI(MBB, MBBI, Alpha::LDA, 2, Alpha::R30)
.addImm(getLower16(NumBytes)).addReg(Alpha::R30);
} else {
std::cerr << "Too big a stack frame at " << NumBytes << "\n";
abort();