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Clean up the public interface of RegScavenger. 

Remove unused methods and make others private.

llvm-svn: 79194
This commit is contained in:
Jakob Stoklund Olesen 2009-08-16 17:41:20 +00:00
parent 7f91fee62b
commit ac09a9a1f5
2 changed files with 20 additions and 44 deletions
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45
llvm/include/llvm/CodeGen/RegisterScavenging.h
View File

@ -95,31 +95,9 @@ public:
///
void skipTo(MachineBasicBlock::iterator I) { MBBI = I; }
/// isReserved - Returns true if a register is reserved. It is never "unused".
bool isReserved(unsigned Reg) const { return ReservedRegs[Reg]; }
/// isUsed / isUsed - Test if a register is currently being used.
///
bool isUsed(unsigned Reg) const { return !RegsAvailable[Reg]; }
bool isUnused(unsigned Reg) const { return RegsAvailable[Reg]; }
/// isAliasUsed - Is Reg or an alias currently in use?
bool isAliasUsed(unsigned Reg) const;
/// getRegsUsed - return all registers currently in use in used.
void getRegsUsed(BitVector &used, bool includeReserved);
/// setUsed / setUnused - Mark the state of one or a number of registers.
///
void setUsed(unsigned Reg);
void setUsed(BitVector &Regs) {
RegsAvailable &= ~Regs;
}
void setUnused(unsigned Reg, const MachineInstr *MI);
void setUnused(BitVector &Regs) {
RegsAvailable |= Regs;
}
/// FindUnusedReg - Find a unused register of the specified register class
/// from the specified set of registers. It return 0 is none is found.
unsigned FindUnusedReg(const TargetRegisterClass *RegClass,
@ -146,9 +124,26 @@ public:
}
private:
/// restoreScavengedReg - Restore scavenged by loading it back from the
/// emergency spill slot. Mark it used.
void restoreScavengedReg();
/// isReserved - Returns true if a register is reserved. It is never "unused".
bool isReserved(unsigned Reg) const { return ReservedRegs.test(Reg); }
/// isUsed / isUsed - Test if a register is currently being used.
///
bool isUsed(unsigned Reg) const { return !RegsAvailable.test(Reg); }
bool isUnused(unsigned Reg) const { return RegsAvailable.test(Reg); }
/// isAliasUsed - Is Reg or an alias currently in use?
bool isAliasUsed(unsigned Reg) const;
/// setUsed / setUnused - Mark the state of one or a number of registers.
///
void setUsed(unsigned Reg);
void setUsed(BitVector &Regs) {
RegsAvailable &= ~Regs;
}
void setUnused(BitVector &Regs) {
RegsAvailable |= Regs;
}
/// Add Reg and all its sub-registers to BV.
void addRegWithSubRegs(BitVector &BV, unsigned Reg);

19
llvm/lib/CodeGen/RegisterScavenging.cpp
View File

@ -40,15 +40,6 @@ void RegScavenger::setUsed(unsigned Reg) {
RegsAvailable.reset(SubReg);
}
/// setUnused - Set the register and its sub-registers as being unused.
void RegScavenger::setUnused(unsigned Reg, const MachineInstr *MI) {
RegsAvailable.set(Reg);
for (const unsigned *SubRegs = TRI->getSubRegisters(Reg);
unsigned SubReg = *SubRegs; ++SubRegs)
RegsAvailable.set(SubReg);
}
bool RegScavenger::isAliasUsed(unsigned Reg) const {
if (isUsed(Reg))
return true;
@ -118,16 +109,6 @@ void RegScavenger::enterBasicBlock(MachineBasicBlock *mbb) {
Tracking = false;
}
void RegScavenger::restoreScavengedReg() {
TII->loadRegFromStackSlot(*MBB, MBBI, ScavengedReg,
ScavengingFrameIndex, ScavengedRC);
MachineBasicBlock::iterator II = prior(MBBI);
TRI->eliminateFrameIndex(II, 0, this);
setUsed(ScavengedReg);
ScavengedReg = 0;
ScavengedRC = NULL;
}
#ifndef NDEBUG
/// isLiveInButUnusedBefore - Return true if register is livein the MBB not
/// not used before it reaches the MI that defines register.