diff options
Diffstat (limited to 'lib/Target/Alpha/AlphaRegisterInfo.cpp')
-rw-r--r-- | lib/Target/Alpha/AlphaRegisterInfo.cpp | 127 |
1 files changed, 10 insertions, 117 deletions
diff --git a/lib/Target/Alpha/AlphaRegisterInfo.cpp b/lib/Target/Alpha/AlphaRegisterInfo.cpp index 327ddb4..001922d 100644 --- a/lib/Target/Alpha/AlphaRegisterInfo.cpp +++ b/lib/Target/Alpha/AlphaRegisterInfo.cpp @@ -35,29 +35,21 @@ #include <cstdlib> using namespace llvm; -//These describe LDAx -static const int IMM_LOW = -32768; -static const int IMM_HIGH = 32767; -static const int IMM_MULT = 65536; +AlphaRegisterInfo::AlphaRegisterInfo(const TargetInstrInfo &tii) + : AlphaGenRegisterInfo(Alpha::ADJUSTSTACKDOWN, Alpha::ADJUSTSTACKUP), + TII(tii) { +} -static long getUpper16(long l) -{ - long y = l / IMM_MULT; - if (l % IMM_MULT > IMM_HIGH) +static long getUpper16(long l) { + long y = l / Alpha::IMM_MULT; + if (l % Alpha::IMM_MULT > Alpha::IMM_HIGH) ++y; return y; } -static long getLower16(long l) -{ +static long getLower16(long l) { long h = getUpper16(l); - return l - h * IMM_MULT; -} - -AlphaRegisterInfo::AlphaRegisterInfo(const TargetInstrInfo &tii) - : AlphaGenRegisterInfo(Alpha::ADJUSTSTACKDOWN, Alpha::ADJUSTSTACKUP), - TII(tii), curgpdist(0) -{ + return l - h * Alpha::IMM_MULT; } const unsigned* AlphaRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) @@ -168,7 +160,7 @@ AlphaRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, DEBUG(errs() << "Corrected Offset " << Offset << " for stack size: " << MF.getFrameInfo()->getStackSize() << "\n"); - if (Offset > IMM_HIGH || Offset < IMM_LOW) { + if (Offset > Alpha::IMM_HIGH || Offset < Alpha::IMM_LOW) { DEBUG(errs() << "Unconditionally using R28 for evil purposes Offset: " << Offset << "\n"); //so in this case, we need to use a temporary register, and move the @@ -186,105 +178,6 @@ AlphaRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, } } - -void AlphaRegisterInfo::emitPrologue(MachineFunction &MF) const { - MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB - MachineBasicBlock::iterator MBBI = MBB.begin(); - MachineFrameInfo *MFI = MF.getFrameInfo(); - DebugLoc dl = (MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc()); - bool FP = hasFP(MF); - - //handle GOP offset - BuildMI(MBB, MBBI, dl, TII.get(Alpha::LDAHg), Alpha::R29) - .addGlobalAddress(MF.getFunction()) - .addReg(Alpha::R27).addImm(++curgpdist); - BuildMI(MBB, MBBI, dl, TII.get(Alpha::LDAg), Alpha::R29) - .addGlobalAddress(MF.getFunction()) - .addReg(Alpha::R29).addImm(curgpdist); - - BuildMI(MBB, MBBI, dl, TII.get(Alpha::ALTENT)) - .addGlobalAddress(MF.getFunction()); - - // Get the number of bytes to allocate from the FrameInfo - long NumBytes = MFI->getStackSize(); - - if (FP) - NumBytes += 8; //reserve space for the old FP - - // Do we need to allocate space on the stack? - if (NumBytes == 0) return; - - unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment(); - NumBytes = (NumBytes+Align-1)/Align*Align; - - // Update frame info to pretend that this is part of the stack... - MFI->setStackSize(NumBytes); - - // adjust stack pointer: r30 -= numbytes - NumBytes = -NumBytes; - if (NumBytes >= IMM_LOW) { - BuildMI(MBB, MBBI, dl, TII.get(Alpha::LDA), Alpha::R30).addImm(NumBytes) - .addReg(Alpha::R30); - } else if (getUpper16(NumBytes) >= IMM_LOW) { - BuildMI(MBB, MBBI, dl, TII.get(Alpha::LDAH), Alpha::R30) - .addImm(getUpper16(NumBytes)).addReg(Alpha::R30); - BuildMI(MBB, MBBI, dl, TII.get(Alpha::LDA), Alpha::R30) - .addImm(getLower16(NumBytes)).addReg(Alpha::R30); - } else { - report_fatal_error("Too big a stack frame at " + Twine(NumBytes)); - } - - //now if we need to, save the old FP and set the new - if (FP) - { - BuildMI(MBB, MBBI, dl, TII.get(Alpha::STQ)) - .addReg(Alpha::R15).addImm(0).addReg(Alpha::R30); - //this must be the last instr in the prolog - BuildMI(MBB, MBBI, dl, TII.get(Alpha::BISr), Alpha::R15) - .addReg(Alpha::R30).addReg(Alpha::R30); - } - -} - -void AlphaRegisterInfo::emitEpilogue(MachineFunction &MF, - MachineBasicBlock &MBB) const { - const MachineFrameInfo *MFI = MF.getFrameInfo(); - MachineBasicBlock::iterator MBBI = prior(MBB.end()); - assert((MBBI->getOpcode() == Alpha::RETDAG || - MBBI->getOpcode() == Alpha::RETDAGp) - && "Can only insert epilog into returning blocks"); - DebugLoc dl = MBBI->getDebugLoc(); - - bool FP = hasFP(MF); - - // Get the number of bytes allocated from the FrameInfo... - long NumBytes = MFI->getStackSize(); - - //now if we need to, restore the old FP - if (FP) { - //copy the FP into the SP (discards allocas) - BuildMI(MBB, MBBI, dl, TII.get(Alpha::BISr), Alpha::R30).addReg(Alpha::R15) - .addReg(Alpha::R15); - //restore the FP - BuildMI(MBB, MBBI, dl, TII.get(Alpha::LDQ), Alpha::R15) - .addImm(0).addReg(Alpha::R15); - } - - if (NumBytes != 0) { - if (NumBytes <= IMM_HIGH) { - BuildMI(MBB, MBBI, dl, TII.get(Alpha::LDA), Alpha::R30).addImm(NumBytes) - .addReg(Alpha::R30); - } else if (getUpper16(NumBytes) <= IMM_HIGH) { - BuildMI(MBB, MBBI, dl, TII.get(Alpha::LDAH), Alpha::R30) - .addImm(getUpper16(NumBytes)).addReg(Alpha::R30); - BuildMI(MBB, MBBI, dl, TII.get(Alpha::LDA), Alpha::R30) - .addImm(getLower16(NumBytes)).addReg(Alpha::R30); - } else { - report_fatal_error("Too big a stack frame at " + Twine(NumBytes)); - } - } -} - unsigned AlphaRegisterInfo::getRARegister() const { return Alpha::R26; } |