MLRISC
MLRISC
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Basic Types
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Cells
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Regions
Regmap

Cells


MLRISC uses the CELLS interface to define all readable/writable resources in a machine architecture, or cells The types defined herein are:
  • cellkind -- different classes of cells are assigned difference cellkinds. The following cellkinds should be present
    • GP -- general purpose registers.
    • FP -- floating point registers.
    • CC -- condition code registers.
    In addition, the cellkinds MEM and CTRL should also be defined. These are used for representing memory based data dependence and control dependence.
    • MEM -- memory
    • CTRL -- control dependence
  • regmap -- register map
  • cellset -- a cellset represent a set of cells. This type can be used to denote live-in/live-out information. Cellsets are implemented as immutable abstract types.

These core definitions are defined in the following signature

 signature CELLS_BASIS =
 sig
    eqtype cellkind 
    type cell = int
    type regmap = cell Intmap.intmap
    exception Cells
 
    val cellkinds : cellkind list 
    val cellkindToString : cellkind -> string
    val firstPseudo : cell                    
    val Reg   : cellkind -> int -> cell
    val GPReg : int -> cell 
    val FPReg : int -> cell
    val cellRange : cellkind -> {low:int, high:int}
    val newCell   : cellkind -> 'a -> cell 
    val cellKind : cell -> cellkind         
    val updateCellKind : cell * cellkind -> unit        
    val numCell   : cellkind -> unit -> int              
    val maxCell   : unit -> cell
    val newReg    : 'a -> cell              
    val newFreg   : 'a -> cell              
    val newVar    : cell -> cell
    val regmap    : unit -> regmap
    val lookup    : regmap -> cell -> cell
    val reset     : unit -> unit
 end
 
  • cellkinds -- this is a list of all the cellkinds defined in the architecture
  • cellkindToString -- this function maps a cellkind into its name
  • firstPseudo -- MLRISC numbered physical resources in the architecture from 0 to firstPseudo-1. This is the first usable virtual register number.
  • Reg -- This function maps the ith physical resource of a particular cellkind to its internal encoding used by MLRISC. Note that all resources in MLRISC are named uniquely.
  • GPReg -- abbreviation for Reg GP
  • FPReg -- abbreviation for Reg FP
  • cellRange -- this returns a range \sml{{low, high}} when given a cellkind, with denotes the range of physical resources
  • newCell -- This function returns a new virtual register of a particular cellkind.
  • newReg -- abbreviation as newCell GP
  • newFreg -- abbreviation as newCell FP
  • cellKind -- When given a cell number, this returns its cellkind. Note that this feature is not enabled by default.
  • updateCellKind -- updates the cellkind of a cell.
  • numCell -- returns the number of virtual cells allocated for one cellkind.
  • maxCell -- returns the next virtual cell id.
  • newVar -- given a cell id, return a new cell id of the same cellkind.
  • regmap -- This function returns a new empty regmap
  • lookup -- This converts a regmap into a lookup function.
  • reset -- This function resets all counters associated with all virtual cells.

 signature CELLS = sig
    include CELLS_BASIS
    val GP   : cellkind 
    val FP   : cellkind
    val CC   : cellkind 
    val MEM  : cellkind 
    val CTRL : cellkind 
    val toString : cellkind -> cell -> string
    val stackptrR : cell 
    val asmTmpR : cell  
    val fasmTmp : cell 
    val zeroReg : cellkind -> cell option
 
    type cellset
 
    val empty      : cellset
    val addCell    : cellkind -> cell * cellset -> cellset
    val rmvCell    : cellkind -> cell * cellset -> cellset
    val addReg     : cell * cellset -> cellset
    val rmvReg     : cell * cellset -> cellset
    val addFreg    : cell * cellset -> cellset
    val rmvFreg    : cell * cellset -> cellset
    val getCell    : cellkind -> cellset -> cell list
    val updateCell : cellkind -> cellset * cell list -> cellset
 
    val cellsetToString : cellset -> string
    val cellsetToString' : (cell -> cell) -> cellset -> string
 
    val cellsetToCells : cellset -> cell list
 end
 
  • toString -- convert a cell id of a certain cellkind into its assembly name.
  • stackptrR -- the cell id of the stack pointer register.
  • asmTmpR -- the cell id of the assembly temporary
  • fasmTmp -- the cell id of the floating point temporary
  • zeroReg -- given the cellkind, returns the cell id of the source that always hold the value of zero, if there is any.
  • empty -- an empty cellset
  • addCell -- inserts a cell into a cellset
  • rmvCell -- remove a cell from a cellset
  • addReg -- abbreviation for addCell GP
  • rmvReg -- abbreviation for rmvCell GP
  • addFreg -- abbreviation for addCell FP
  • rmvFreg -- abbreviation for rmvCell FP
  • getCell -- lookup all cells of a particular cellkind from the cellset
  • updateCell -- replace all cells of a particular cellkind from the cellset.
  • cellsetToString -- pretty print a cellset
  • cellsetToString' -- pretty print a cellset, but first apply a regmap function.
  • cellsetToCells -- convert a cellset into list form.

Lal George
Allen Leung
SML/NJ Validate this page
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Last modified: Thu Jan 9 19:38:15 EST 2003 by leunga@slinky