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Interface clean up.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34770 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-03-01 02:19:39 +00:00
parent 28654b6205
commit a3756ee7fe
1 changed files with 7 additions and 13 deletions
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20
lib/CodeGen/RegisterScavenging.cpp
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@ -25,7 +25,7 @@
#include "llvm/ADT/STLExtras.h" #include "llvm/ADT/STLExtras.h"
using namespace llvm; using namespace llvm;
void RegScavenger::init(MachineBasicBlock *mbb) { void RegScavenger::enterBasicBlock(MachineBasicBlock *mbb) {
const MachineFunction &MF = *mbb->getParent(); const MachineFunction &MF = *mbb->getParent();
const TargetMachine &TM = MF.getTarget(); const TargetMachine &TM = MF.getTarget();
const MRegisterInfo *RegInfo = TM.getRegisterInfo(); const MRegisterInfo *RegInfo = TM.getRegisterInfo();
@ -35,9 +35,11 @@ void RegScavenger::init(MachineBasicBlock *mbb) {
if (!MBB) { if (!MBB) {
NumPhysRegs = RegInfo->getNumRegs(); NumPhysRegs = RegInfo->getNumRegs();
ReservedRegs = RegInfo->getReservedRegs(MF);
RegStates.resize(NumPhysRegs); RegStates.resize(NumPhysRegs);
// Create reserved registers bitvector.
ReservedRegs = RegInfo->getReservedRegs(MF);
// Create callee-saved registers bitvector. // Create callee-saved registers bitvector.
CalleeSavedRegs.resize(NumPhysRegs); CalleeSavedRegs.resize(NumPhysRegs);
const unsigned *CSRegs = RegInfo->getCalleeSavedRegs(); const unsigned *CSRegs = RegInfo->getCalleeSavedRegs();
@ -51,7 +53,7 @@ void RegScavenger::init(MachineBasicBlock *mbb) {
// All registers started out unused. // All registers started out unused.
RegStates.set(); RegStates.set();
// Create reserved registers bitvector. // Reserved registers are always used.
RegStates ^= ReservedRegs; RegStates ^= ReservedRegs;
// Live-in registers are in use. // Live-in registers are in use.
@ -59,6 +61,8 @@ void RegScavenger::init(MachineBasicBlock *mbb) {
for (MachineBasicBlock::const_livein_iterator I = MBB->livein_begin(), for (MachineBasicBlock::const_livein_iterator I = MBB->livein_begin(),
E = MBB->livein_end(); I != E; ++I) E = MBB->livein_end(); I != E; ++I)
setUsed(*I); setUsed(*I);
Tracking = false;
} }
void RegScavenger::forward() { void RegScavenger::forward() {
@ -168,13 +172,3 @@ unsigned RegScavenger::FindUnusedReg(const TargetRegisterClass *RegClass,
int Reg = RegStatesCopy.find_first(); int Reg = RegStatesCopy.find_first();
return (Reg == -1) ? 0 : Reg; return (Reg == -1) ? 0 : Reg;
} }
void RegScavenger::clear() {
if (MBB) {
MBBI = MBB->end();
MBB = NULL;
}
Tracking = false;
RegStates.clear();
}