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-- { dg-do run }
with System, Ada.Unchecked_Conversion; use System;
procedure BLKextract_From_Reg is
type Byte is range 0 .. +255;
for Byte'size use 8;
type RGB is array (1 .. 3) of Byte;
for RGB'Size use 24;
type RAW_Packet is range 0 .. 2 ** 32 - 1;
for RAW_Packet'Size use 32;
type Composite_Packet is record
Values : RGB;
Pad : Byte;
end record;
for Composite_Packet use record
Values at 0 range 0 .. 23;
Pad at 3 range 0 .. 7;
end record;
for Composite_Packet'Size use 32;
function To_Composite_Packet is
new Ada.Unchecked_Conversion (RAW_Packet, Composite_Packet);
function Blob return RGB is
RAW_Blob : RAW_Packet := 16#01020304#;
begin
return To_Composite_Packet (RAW_Blob).Values;
end;
Blob_Color : RGB := Blob;
Expected_Color : RGB;
begin
if System.Default_Bit_Order = High_Order_First then
Expected_Color := (1 => 1, 2 => 2, 3 => 3);
else
Expected_Color := (1 => 4, 2 => 3, 3 => 2);
end if;
for I in Blob_Color'Range loop
if Blob_Color (I) /= Expected_Color (I) then
raise Program_Error;
end if;
end loop;
end;
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