return MO->Contents.Reg.Next;
}
- /// UsedRegUnits - This is a bit vector that is computed and set by the
- /// register allocator, and must be kept up to date by passes that run after
- /// register allocation (though most don't modify this). This is used
- /// so that the code generator knows which callee save registers to save and
- /// for other target specific uses.
- /// This vector has bits set for register units that are modified in the
- /// current function. It doesn't include registers clobbered by function
- /// calls with register mask operands.
- BitVector UsedRegUnits;
-
/// UsedPhysRegMask - Additional used physregs including aliases.
/// This bit vector represents all the registers clobbered by function calls.
- /// It can model things that UsedRegUnits can't, such as function calls that
- /// clobber ymm7 but preserve the low half in xmm7.
BitVector UsedPhysRegMask;
/// ReservedRegs - This is a bit vector of reserved registers. The target
/// ignored.
bool isPhysRegModified(unsigned PhysReg) const;
- //===--------------------------------------------------------------------===//
- // Physical Register Use Info
- //===--------------------------------------------------------------------===//
-
- /// isPhysRegUsed - Return true if the specified register is used in this
- /// function. Also check for clobbered aliases and registers clobbered by
- /// function calls with register mask operands.
- ///
- /// This only works after register allocation.
- bool isPhysRegUsed(unsigned Reg) const {
- if (UsedPhysRegMask.test(Reg))
- return true;
- for (MCRegUnitIterator Units(Reg, getTargetRegisterInfo());
- Units.isValid(); ++Units)
- if (UsedRegUnits.test(*Units))
- return true;
- return false;
- }
-
- /// Mark the specified register unit as used in this function.
- /// This should only be called during and after register allocation.
- void setRegUnitUsed(unsigned RegUnit) {
- UsedRegUnits.set(RegUnit);
- }
-
- /// setPhysRegUsed - Mark the specified register used in this function.
- /// This should only be called during and after register allocation.
- void setPhysRegUsed(unsigned Reg) {
- for (MCRegUnitIterator Units(Reg, getTargetRegisterInfo());
- Units.isValid(); ++Units)
- UsedRegUnits.set(*Units);
- }
-
/// addPhysRegsUsedFromRegMask - Mark any registers not in RegMask as used.
/// This corresponds to the bit mask attached to register mask operands.
void addPhysRegsUsedFromRegMask(const uint32_t *RegMask) {
UsedPhysRegMask.setBitsNotInMask(RegMask);
}
- /// setPhysRegUnused - Mark the specified register unused in this function.
- /// This should only be called during and after register allocation.
- void setPhysRegUnused(unsigned Reg) {
- UsedPhysRegMask.reset(Reg);
- for (MCRegUnitIterator Units(Reg, getTargetRegisterInfo());
- Units.isValid(); ++Units)
- UsedRegUnits.reset(*Units);
- }
-
-
//===--------------------------------------------------------------------===//
// Reserved Register Info
//===--------------------------------------------------------------------===//