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Use RegisterClassInfo::getOrder in RAFast.

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This saves two virtual function calls and an Allocatable BitVector test,
making RAFast run 2% faster.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132471 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-06-02 18:35:30 +00:00
parent 6f888a80d5
commit 5d20c3152b
1 changed files with 7 additions and 10 deletions
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17
lib/CodeGen/RegAllocFast.cpp
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@ -13,6 +13,7 @@
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "regalloc"
#include "RegisterClassInfo.h"
#include "llvm/BasicBlock.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
@ -58,6 +59,7 @@ namespace {
MachineRegisterInfo *MRI;
const TargetRegisterInfo *TRI;
const TargetInstrInfo *TII;
RegisterClassInfo RegClassInfo;
// Basic block currently being allocated.
MachineBasicBlock *MBB;
@ -499,14 +501,12 @@ void RAFast::allocVirtReg(MachineInstr *MI, LiveRegEntry &LRE, unsigned Hint) {
}
}
TargetRegisterClass::iterator AOB = RC->allocation_order_begin(*MF);
TargetRegisterClass::iterator AOE = RC->allocation_order_end(*MF);
ArrayRef<unsigned> AO = RegClassInfo.getOrder(RC);
// First try to find a completely free register.
for (TargetRegisterClass::iterator I = AOB; I != AOE; ++I) {
for (ArrayRef<unsigned>::iterator I = AO.begin(), E = AO.end(); I != E; ++I) {
unsigned PhysReg = *I;
if (PhysRegState[PhysReg] == regFree && !UsedInInstr.test(PhysReg) &&
Allocatable.test(PhysReg))
if (PhysRegState[PhysReg] == regFree && !UsedInInstr.test(PhysReg))
return assignVirtToPhysReg(LRE, PhysReg);
}
@ -514,11 +514,7 @@ void RAFast::allocVirtReg(MachineInstr *MI, LiveRegEntry &LRE, unsigned Hint) {
<< RC->getName() << "\n");
unsigned BestReg = 0, BestCost = spillImpossible;
for (TargetRegisterClass::iterator I = AOB; I != AOE; ++I) {
if (!Allocatable.test(*I)) {
DEBUG(dbgs() << "\tRegister " << *I << " is not allocatable.\n");
continue;
}
for (ArrayRef<unsigned>::iterator I = AO.begin(), E = AO.end(); I != E; ++I) {
unsigned Cost = calcSpillCost(*I);
DEBUG(dbgs() << "\tRegister: " << *I << "\n");
DEBUG(dbgs() << "\tCost: " << Cost << "\n");
@ -1048,6 +1044,7 @@ bool RAFast::runOnMachineFunction(MachineFunction &Fn) {
TM = &Fn.getTarget();
TRI = TM->getRegisterInfo();
TII = TM->getInstrInfo();
RegClassInfo.runOnMachineFunction(Fn);
UsedInInstr.resize(TRI->getNumRegs());
Allocatable = TRI->getAllocatableSet(*MF);