1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- I N T E R F A C E S --
11 -- This specification is adapted from the Ada Reference Manual for use with --
12 -- GNAT. In accordance with the copyright of that document, you can freely --
13 -- copy and modify this specification, provided that if you redistribute a --
14 -- modified version, any changes that you have made are clearly indicated. --
16 ------------------------------------------------------------------------------
18 -- This is the OpenVMS version of this package which adds Float_Representation
19 -- pragmas to the IEEE floating point types to enusre they remain IEEE in
20 -- thse presence of a VAX_Float Float_Representatin configuration pragma.
22 -- It assumes integer sizes of 8, 16, 32 and 64 are available, and that IEEE
23 -- floating-point formats are available.
26 pragma Pure (Interfaces);
28 type Integer_8 is range -2 ** 7 .. 2 ** 7 - 1;
29 for Integer_8'Size use 8;
31 type Integer_16 is range -2 ** 15 .. 2 ** 15 - 1;
32 for Integer_16'Size use 16;
34 type Integer_32 is range -2 ** 31 .. 2 ** 31 - 1;
35 for Integer_32'Size use 32;
37 type Integer_64 is range -2 ** 63 .. 2 ** 63 - 1;
38 for Integer_64'Size use 64;
40 type Unsigned_8 is mod 2 ** 8;
41 for Unsigned_8'Size use 8;
43 type Unsigned_16 is mod 2 ** 16;
44 for Unsigned_16'Size use 16;
46 type Unsigned_32 is mod 2 ** 32;
47 for Unsigned_32'Size use 32;
49 type Unsigned_64 is mod 2 ** 64;
50 for Unsigned_64'Size use 64;
62 function Shift_Right_Arithmetic
87 function Shift_Right_Arithmetic
103 (Value : Unsigned_32;
108 (Value : Unsigned_32;
112 function Shift_Right_Arithmetic
113 (Value : Unsigned_32;
118 (Value : Unsigned_32;
122 function Rotate_Right
123 (Value : Unsigned_32;
128 (Value : Unsigned_64;
133 (Value : Unsigned_64;
137 function Shift_Right_Arithmetic
138 (Value : Unsigned_64;
143 (Value : Unsigned_64;
147 function Rotate_Right
148 (Value : Unsigned_64;
152 pragma Import (Intrinsic, Shift_Left);
153 pragma Import (Intrinsic, Shift_Right);
154 pragma Import (Intrinsic, Shift_Right_Arithmetic);
155 pragma Import (Intrinsic, Rotate_Left);
156 pragma Import (Intrinsic, Rotate_Right);
158 -- Floating point types. We use the digits value to define the IEEE
159 -- forms, otherwise a configuration pragma specifying VAX float can
160 -- default the digits to an illegal value for IEEE.
161 -- Note: it is harmless, and explicitly permitted, to include additional
162 -- types in interfaces, so it is not wrong to have IEEE_Extended_Float
163 -- defined even if the extended format is not available.
165 type IEEE_Float_32 is digits 6;
166 pragma Float_Representation (IEEE_Float, IEEE_Float_32);
168 type IEEE_Float_64 is digits 15;
169 pragma Float_Representation (IEEE_Float, IEEE_Float_64);
171 type IEEE_Extended_Float is digits 15;
172 pragma Float_Representation (IEEE_Float, IEEE_Extended_Float);