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Only do stuff for the REAL number of physical registers we have, not 1024. 

This speeds up live variables a lot, from .60/.39s -> .47/.26s in LLC, for
the first/second pass respectively.

llvm-svn: 11216
This commit is contained in:
Chris Lattner 2004-02-09 01:35:21 +00:00
parent 490627a404
commit 26407384ec
1 changed files with 8 additions and 10 deletions
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18
llvm/lib/CodeGen/LiveVariables.cpp
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@ -158,17 +158,18 @@ void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) {
}
bool LiveVariables::runOnMachineFunction(MachineFunction &MF) {
const TargetInstrInfo &TII = MF.getTarget().getInstrInfo();
RegInfo = MF.getTarget().getRegisterInfo();
assert(RegInfo && "Target doesn't have register information?");
// First time though, initialize AllocatablePhysicalRegisters for the target
if (AllocatablePhysicalRegisters.empty()) {
const MRegisterInfo &MRI = *MF.getTarget().getRegisterInfo();
assert(&MRI && "Target doesn't have register information?");
// Make space, initializing to false...
AllocatablePhysicalRegisters.resize(MRegisterInfo::FirstVirtualRegister);
AllocatablePhysicalRegisters.resize(RegInfo->getNumRegs());
// Loop over all of the register classes...
for (MRegisterInfo::regclass_iterator RCI = MRI.regclass_begin(),
E = MRI.regclass_end(); RCI != E; ++RCI)
for (MRegisterInfo::regclass_iterator RCI = RegInfo->regclass_begin(),
E = RegInfo->regclass_end(); RCI != E; ++RCI)
// Loop over all of the allocatable registers in the function...
for (TargetRegisterClass::iterator I = (*RCI)->allocation_order_begin(MF),
E = (*RCI)->allocation_order_end(MF); I != E; ++I)
@ -191,9 +192,6 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &MF) {
PhysRegInfo = PhysRegInfoA;
PhysRegUsed = PhysRegUsedA;
const TargetInstrInfo &TII = MF.getTarget().getInstrInfo();
RegInfo = MF.getTarget().getRegisterInfo();
/// Get some space for a respectable number of registers...
VirtRegInfo.resize(64);
@ -294,7 +292,7 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &MF) {
// Loop over PhysRegInfo, killing any registers that are available at the
// end of the basic block. This also resets the PhysRegInfo map.
for (unsigned i = 0, e = MRegisterInfo::FirstVirtualRegister; i != e; ++i)
for (unsigned i = 0, e = RegInfo->getNumRegs(); i != e; ++i)
if (PhysRegInfo[i])
HandlePhysRegDef(i, 0);
}