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Change UsedPhysRegs from array bool to BitVector to save some space. Setting / getting its states now go through MachineFunction.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36451 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-04-25 22:10:09 +00:00
parent a03f1e3b0c
commit 505e5510a2
2 changed files with 13 additions and 21 deletions
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30
include/llvm/CodeGen/MachineFunction.h
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@ -21,6 +21,7 @@
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/Support/Annotation.h"
#include "llvm/ADT/BitVector.h"
namespace llvm {
@ -103,12 +104,12 @@ class MachineFunction : private Annotation {
// numbered and this vector keeps track of the mapping from ID's to MBB's.
std::vector<MachineBasicBlock*> MBBNumbering;
/// UsedPhysRegs - This is a new[]'d array of bools that is computed and set
/// by the register allocator, and must be kept up to date by passes that run
/// after register allocation (though most don't modify this). This is used
/// UsedPhysRegs - This is a bit vector that is computed and set by the
/// register allocator, and must be kept up to date by passes that run after
/// register allocation (though most don't modify this). This is used
/// so that the code generator knows which callee save registers to save and
/// for other target specific uses.
bool *UsedPhysRegs;
BitVector UsedPhysRegs;
/// LiveIns/LiveOuts - Keep track of the physical registers that are
/// livein/liveout of the function. Live in values are typically arguments in
@ -170,26 +171,17 @@ public:
return const_cast<MachineFunction*>(this)->getInfo<Ty>();
}
/// setUsedPhysRegs - The register allocator should call this to initialized
/// the UsedPhysRegs set. This should be passed a new[]'d array with entries
/// for all of the physical registers that the target supports. Each array
/// entry should be set to true iff the physical register is used within the
/// function.
void setUsedPhysRegs(bool *UPR) { UsedPhysRegs = UPR; }
/// getUsedPhysregs - This returns the UsedPhysRegs array. This returns null
/// before register allocation.
bool *getUsedPhysregs() { return UsedPhysRegs; }
const bool *getUsedPhysregs() const { return UsedPhysRegs; }
/// isPhysRegUsed - Return true if the specified register is used in this
/// function. This only works after register allocation.
bool isPhysRegUsed(unsigned Reg) const { return UsedPhysRegs[Reg]; }
/// changePhyRegUsed - This method allows code that runs after register
/// allocation to keep the PhysRegsUsed array up-to-date.
void changePhyRegUsed(unsigned Reg, bool State) { UsedPhysRegs[Reg] = State; }
/// setPhysRegUsed - Mark the specified register used in this function.
/// This should only be called during and after register allocation.
void setPhysRegUsed(unsigned Reg) { UsedPhysRegs[Reg] = true; }
/// setPhysRegUnused - Mark the specified register unused in this function.
/// This should only be called during and after register allocation.
void setPhysRegUnused(unsigned Reg) { UsedPhysRegs[Reg] = false; }
// LiveIn/LiveOut management methods.

4
lib/CodeGen/MachineFunction.cpp
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@ -114,11 +114,12 @@ void ilist_traits<MachineBasicBlock>::transferNodesFromList(
MachineFunction::MachineFunction(const Function *F,
const TargetMachine &TM)
: Annotation(MF_AID), Fn(F), Target(TM), UsedPhysRegs(0) {
: Annotation(MF_AID), Fn(F), Target(TM) {
SSARegMapping = new SSARegMap();
MFInfo = 0;
FrameInfo = new MachineFrameInfo();
ConstantPool = new MachineConstantPool(TM.getTargetData());
UsedPhysRegs.resize(TM.getRegisterInfo()->getNumRegs());
// Set up jump table.
const TargetData &TD = *TM.getTargetData();
@ -138,7 +139,6 @@ MachineFunction::~MachineFunction() {
delete FrameInfo;
delete ConstantPool;
delete JumpTableInfo;
delete[] UsedPhysRegs;
}