Subversion Repositories tendra.SVN

/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

	/* **************************************************** */

	/*							*/

	/*  Target Dependency Token Definitions for dec_alpha	*/

	/*							*/

	/* **************************************************** */

	/* LOCAL TOKENS */

Tokdef REP_V = [] VARIETY

	/* variety for integer widths and float_sequence */

var_width (false, 16);

Tokdef NATTEST = [a:NAT, comp:NTEST, b:NAT] EXP

	/* comparison of nats, for static conditionals */

? { ?(snat_from_nat(false,a)(REP_V) comp snat_from_nat(false,b)(REP_V));

    1(REP_V)

  | 0(REP_V)

};

Tokdef PUN = [from_sh:SHAPE, to_sh:SHAPE, val:EXP] EXP

	/* representation preserving conversion */

component (to_sh,

  Cons [ shape_offset(from_sh) .max. shape_offset(to_sh) ] (

    offset_zero(alignment(from_sh)) : val

  ),

  offset_zero(alignment(to_sh))

);

Tokdef PTR_V = [] VARIETY

	/* variety for converted pointers */

var_width (true, 64);

	/* INTEGER VARIETY REPRESENTATIONS */

Tokdef .~rep_var_width = [w:NAT] NAT

NAT ? ( NATTEST [w, <=, 8],

  8,

  NAT ? ( NATTEST [w, <=, 16],

    16,

    NAT ? ( NATTEST [w, <=, 32],

      32,

      NAT ? ( NATTEST [w, <=, 64],

        64,

      )

    )

  )

);

Tokdef .~rep_atomic_width = [] NAT

32;

	/* FLOATING VARIETY REPRESENTATIONS */

/* sequence: 1=single, 2=double, 3=extended */

Tokdef .~rep_fv = [n:NAT] FLOATING_VARIETY

FLOATING_VARIETY ? ( NATTEST [n, ==, 1],

  flvar_parms (2, 24, 126, 127),

  FLOATING_VARIETY ? ( NATTEST [n, ==, 2],

    flvar_parms (2, 53, 1022, 1023),

    flvar_parms(

	computed_nat(#"No extended floats on current implementation"),

	0, 0, 0)

  )

);

Tokdef .~rep_fv_width = [n:NAT] NAT

NAT ? ( NATTEST [n, ==, 1],

  32,

  NAT ? ( NATTEST [n, ==, 2],

    64,

    )

);

Tokdef .~rep_fv_radix = [n:NAT] NAT

2;

Tokdef .~rep_fv_mantissa = [n:NAT] NAT

NAT ? ( NATTEST [n, ==, 1],

  24,

  53

);

Tokdef .~rep_fv_min_exp = [n:NAT] NAT

NAT ? ( NATTEST [n, ==, 1],

  149,

  1074

);

Tokdef .~rep_fv_max_exp = [n:NAT] NAT

NAT ? ( NATTEST [n, ==, 1],

  127,

  1023

);

Tokdef .~rep_fv_epsilon = [n:NAT] EXP

EXP ? ( NATTEST [n, ==, 1],

  (2r1.0 E -23 (.~rep_fv[n])),

  (2r1.0 E -52 (.~rep_fv[n]))

);

Tokdef .~rep_fv_min_val = [n:NAT] EXP

EXP ? ( NATTEST [n, ==, 1],

  (2r1.0 E -149 (.~rep_fv[n])),

  (2r1.0 E -1074 (.~rep_fv[n]))

);

Tokdef .~rep_fv_max_val = [n:NAT] EXP

EXP ? ( NATTEST [n, ==, 1],

  (8r3.77777774 E 42

    (.~rep_fv[n])),

  (8r1.777777777777777774 E 341

      (.~rep_fv[n]))

);

	/* NON-NUMERIC REPRESENTATIONS */

Tokdef .~ptr_width = [] NAT

64;

Tokdef .~best_div = [] NAT

2;

Tokdef .~little_endian = [] BOOL

true;

	/* COMMON CONVERSION ROUTINES */

Tokdef .~ptr_to_ptr = [a1:ALIGNMENT, a2:ALIGNMENT, p:EXP] EXP

PUN [ pointer(a1), pointer(a2), p ];

Tokdef .~ptr_to_int = [a:ALIGNMENT, v:VARIETY, p:EXP] EXP

([v] PUN [ pointer(a), integer(PTR_V), p ]);

Tokdef .~int_to_ptr = [v:VARIETY, a:ALIGNMENT, i:EXP] EXP

PUN [ integer(PTR_V), pointer(a), [PTR_V] i ];

Tokdef .~f_to_ptr = [a:ALIGNMENT, fn:EXP] EXP

PUN [ proc, pointer(a), fn ];

Tokdef .~ptr_to_f = [a:ALIGNMENT, p:EXP] EXP

PUN [ pointer(a), proc, p ];

Keep (

.~rep_var_width, .~rep_atomic_width,

.~rep_fv, .~rep_fv_width, .~rep_fv_radix, .~rep_fv_mantissa, .~rep_fv_min_exp, 

.~rep_fv_max_exp, .~rep_fv_epsilon, .~rep_fv_min_val, .~rep_fv_max_val,

.~ptr_width, .~best_div, .~little_endian,

.~ptr_to_ptr, .~ptr_to_int, .~int_to_ptr, .~f_to_ptr, .~ptr_to_f

)