- const TargetInstrDescriptor &Desc = TM->getInstrInfo().get(Opcode);
- const unsigned *Regs = Desc.ImplicitUses;
- while (*Regs)
- RegsUsed[*Regs++] = true;
-
- Regs = Desc.ImplicitDefs;
- while (*Regs)
- RegsUsed[*Regs++] = true;
-
- // Loop over uses, move from memory into registers
+ const TargetInstrDescriptor &Desc = TM->getInstrInfo()->get(Opcode);
+ const unsigned *Regs;
+ if (Desc.ImplicitUses) {
+ for (Regs = Desc.ImplicitUses; *Regs; ++Regs)
+ RegsUsed[*Regs] = true;
+ }
+
+ if (Desc.ImplicitDefs) {
+ for (Regs = Desc.ImplicitDefs; *Regs; ++Regs) {
+ RegsUsed[*Regs] = true;
+ MF->setPhysRegUsed(*Regs);
+ }
+ }
+
+ // Loop over uses, move from memory into registers.