[AMDGPU] Use range-based for loops (NFC) (#106184)

Author: kazutakahirata

llvm/lib/Target/AMDGPU/R600EmitClauseMarkers.cpp

@@ -180,11 +180,8 @@ class R600EmitClauseMarkers : public MachineFunctionPass {
                         MachineBasicBlock::iterator BBEnd) {
     const R600RegisterInfo &TRI = TII->getRegisterInfo();
     //TODO: change this to defs?
-    for (MachineInstr::const_mop_iterator
-           MOI = Def->operands_begin(),
-           MOE = Def->operands_end(); MOI != MOE; ++MOI) {
-      if (!MOI->isReg() || !MOI->isDef() ||
-          TRI.isPhysRegLiveAcrossClauses(MOI->getReg()))
+    for (MachineOperand &MO : Def->all_defs()) {
+      if (TRI.isPhysRegLiveAcrossClauses(MO.getReg()))
         continue;
 
       // Def defines a clause local register, so check that its use will fit
@@ -208,11 +205,11 @@ class R600EmitClauseMarkers : public MachineFunctionPass {
         // occur in the same basic block as its definition, because
         // it is illegal for the scheduler to schedule them in
         // different blocks.
-        if (UseI->readsRegister(MOI->getReg(), &TRI))
+        if (UseI->readsRegister(MO.getReg(), &TRI))
           LastUseCount = AluInstCount;
 
         // Exit early if the current use kills the register
-        if (UseI != Def && UseI->killsRegister(MOI->getReg(), &TRI))
+        if (UseI != Def && UseI->killsRegister(MO.getReg(), &TRI))
           break;
       }
       if (LastUseCount)

llvm/lib/Target/AMDGPU/R600MachineScheduler.cpp

@@ -350,13 +350,9 @@ void R600SchedStrategy::AssignSlot(MachineInstr* MI, unsigned Slot) {
   Register DestReg = MI->getOperand(DstIndex).getReg();
   // PressureRegister crashes if an operand is def and used in the same inst
   // and we try to constraint its regclass
-  for (MachineInstr::mop_iterator It = MI->operands_begin(),
-      E = MI->operands_end(); It != E; ++It) {
-    MachineOperand &MO = *It;
-    if (MO.isReg() && !MO.isDef() &&
-        MO.getReg() == DestReg)
+  for (const MachineOperand &MO : MI->all_uses())
+    if (MO.getReg() == DestReg)
       return;
-  }
   // Constrains the regclass of DestReg to assign it to Slot
   switch (Slot) {
   case 0:

llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp

@@ -883,10 +883,8 @@ void WaitcntBrackets::updateByEvent(const SIInstrInfo *TII,
         // can be used as the actual source after export patching, so
         // we need to treat them like sources and set the EXP_CNT
         // score.
-        for (unsigned I = 0, E = Inst.getNumOperands(); I != E; ++I) {
-          MachineOperand &DefMO = Inst.getOperand(I);
-          if (DefMO.isReg() && DefMO.isDef() &&
-              TRI->isVGPR(*MRI, DefMO.getReg())) {
+        for (MachineOperand &DefMO : Inst.all_defs()) {
+          if (TRI->isVGPR(*MRI, DefMO.getReg())) {
             setRegScore(
                 TRI->getEncodingValue(AMDGPU::getMCReg(DefMO.getReg(), *ST)),
                 EXP_CNT, CurrScore);