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RegScavenger interface change to make it more flexible.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34690 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-02-27 21:09:48 +00:00
parent 171eed5334
commit bb6fb3357d
2 changed files with 50 additions and 20 deletions
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36
include/llvm/CodeGen/RegisterScavenging.h
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@@ -27,16 +27,34 @@ class TargetRegisterClass;
class RegScavenger {
MachineBasicBlock *MBB;
MachineBasicBlock::iterator MBBI;
bool MBBIInited;
unsigned NumPhysRegs;
/// Initialized - All states are initialized and ready to go!
bool Initialized;
/// RegStates - The current state of all the physical registers immediately
/// before MBBI. One bit per physical register. If bit is set that means it's
/// available, unset means the register is currently being used.
BitVector RegStates;
public:
RegScavenger(MachineBasicBlock *mbb);
RegScavenger()
: MBB(NULL), Initialized(false) {};
RegScavenger(MachineBasicBlock *mbb)
: MBB(mbb), Initialized(false) {};
/// Init - Initialize the states.
///
void init();
/// Reset - Discard previous states and re-initialize the states given for
/// the specific basic block.
void reset(MachineBasicBlock *mbb) {
MBB = mbb;
clear();
init();
}
/// forward / backward - Move the internal MBB iterator and update register
/// states.
@@ -45,8 +63,12 @@ public:
/// forward / backward - Move the internal MBB iterator and update register
/// states until it has reached but not processed the specific iterator.
void forward(MachineBasicBlock::iterator I);
void backward(MachineBasicBlock::iterator I);
void forward(MachineBasicBlock::iterator I) {
while (MBBI != I) forward();
}
void backward(MachineBasicBlock::iterator I) {
while (MBBI != I) backward();
}
/// isReserved - Returns true if a register is reserved. It is never "unused".
bool isReserved(unsigned Reg) const { return ReservedRegs[Reg]; }
@@ -69,10 +91,16 @@ public:
bool ExCalleeSaved = false) const;
private:
/// clear - Clear states.
///
void clear();
/// CalleeSavedrRegs - A bitvector of callee saved registers for the target.
///
BitVector CalleeSavedRegs;
/// ReservedRegs - A bitvector of reserved registers.
///
BitVector ReservedRegs;
};