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[SystemZ] Remove unused code in SystemZElimCompare.cpp 

The Reference IndirectDef and IndirectUse members were unused and therefore
removed.

llvm-svn: 249824
This commit is contained in:
Jonas Paulsson 2015-10-09 11:27:44 +00:00
parent 2a7e046c7f
commit ee3685fd45
1 changed files with 7 additions and 19 deletions
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26
llvm/lib/Target/SystemZ/SystemZElimCompare.cpp
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@ -37,13 +37,11 @@ namespace {
// instructions.
struct Reference {
Reference()
: Def(false), Use(false), IndirectDef(false), IndirectUse(false) {}
: Def(false), Use(false) {}
Reference &operator|=(const Reference &Other) {
Def |= Other.Def;
IndirectDef |= Other.IndirectDef;
Use |= Other.Use;
IndirectUse |= Other.IndirectUse;
return *this;
}
@ -53,11 +51,6 @@ struct Reference {
// via a sub- or super-register.
bool Def;
bool Use;
// True if the register is defined or used indirectly, by a sub- or
// super-register.
bool IndirectDef;
bool IndirectUse;
};
class SystemZElimCompare : public MachineFunctionPass {
@ -132,22 +125,18 @@ static bool resultTests(MachineInstr *MI, unsigned Reg) {
return false;
}
// Describe the references to Reg in MI, including sub- and super-registers.
// Describe the references to Reg or any of its aliases in MI.
Reference SystemZElimCompare::getRegReferences(MachineInstr *MI, unsigned Reg) {
Reference Ref;
for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
const MachineOperand &MO = MI->getOperand(I);
if (MO.isReg()) {
if (unsigned MOReg = MO.getReg()) {
if (MOReg == Reg || TRI->regsOverlap(MOReg, Reg)) {
if (MO.isUse()) {
if (TRI->regsOverlap(MOReg, Reg)) {
if (MO.isUse())
Ref.Use = true;
Ref.IndirectUse |= (MOReg != Reg);
}
if (MO.isDef()) {
else if (MO.isDef())
Ref.Def = true;
Ref.IndirectDef |= (MOReg != Reg);
}
}
}
}
@ -469,12 +458,11 @@ bool SystemZElimCompare::processBlock(MachineBasicBlock &MBB) {
continue;
}
Reference CCRefs(getRegReferences(MI, SystemZ::CC));
if (CCRefs.Def) {
if (MI->definesRegister(SystemZ::CC)) {
CCUsers.clear();
CompleteCCUsers = true;
}
if (CompleteCCUsers && CCRefs.Use)
if (MI->readsRegister(SystemZ::CC) && CompleteCCUsers)
CCUsers.push_back(MI);
}
return Changed;