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Avoid scanning the long tail of physreg operands on calls

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103823 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-05-14 21:55:52 +00:00
parent 26c6995654
commit e97dda4fc5
1 changed files with 9 additions and 4 deletions
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13
lib/CodeGen/RegAllocFast.cpp
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@ -663,12 +663,18 @@ void RAFast::AllocateBasicBlock(MachineBasicBlock &MBB) {
// First scan.
// Mark physreg uses and early clobbers as used.
// Find the end of the virtreg operands
unsigned VirtOpEnd = 0;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
MachineOperand &MO = MI->getOperand(i);
if (!MO.isReg()) continue;
unsigned Reg = MO.getReg();
if (!Reg || !TargetRegisterInfo::isPhysicalRegister(Reg) ||
ReservedRegs.test(Reg)) continue;
if (!Reg) continue;
if (TargetRegisterInfo::isVirtualRegister(Reg)) {
VirtOpEnd = i+1;
continue;
}
if (ReservedRegs.test(Reg)) continue;
if (MO.isUse()) {
usePhysReg(MO);
} else if (MO.isEarlyClobber()) {
@ -677,11 +683,10 @@ void RAFast::AllocateBasicBlock(MachineBasicBlock &MBB) {
}
}
// Second scan.
// Allocate virtreg uses and early clobbers.
// Collect VirtKills
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
for (unsigned i = 0; i != VirtOpEnd; ++i) {
MachineOperand &MO = MI->getOperand(i);
if (!MO.isReg()) continue;
unsigned Reg = MO.getReg();