- // PhysRegsUsed - This array is effectively a map, containing entries for
- // each physical register that currently has a value (ie, it is in
- // Virt2PhysRegMap). The value mapped to is the virtual register
- // corresponding to the physical register (the inverse of the
- // Virt2PhysRegMap), or 0. The value is set to 0 if this register is pinned
- // because it is used by a future instruction, and to -2 if it is not
- // allocatable. If the entry for a physical register is -1, then the
- // physical register is "not in the map".
- //
- std::vector<int> PhysRegsUsed;
-
- // PhysRegsUseOrder - This contains a list of the physical registers that
- // currently have a virtual register value in them. This list provides an
- // ordering of registers, imposing a reallocation order. This list is only
- // used if all registers are allocated and we have to spill one, in which
- // case we spill the least recently used register. Entries at the front of
- // the list are the least recently used registers, entries at the back are
- // the most recently used.
- //
- std::vector<unsigned> PhysRegsUseOrder;
-
- // VirtRegModified - This bitset contains information about which virtual
- // registers need to be spilled back to memory when their registers are
- // scavenged. If a virtual register has simply been rematerialized, there
- // is no reason to spill it to memory when we need the register back.
- //
- std::vector<bool> VirtRegModified;