| register | use machine register |
Dirty
| Description | When a variable, constant or parameter is declared, you can request that the item be placed in a machine register. This should be done only for programs requiring considerable efficiency.
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| Example |
var register counter : int
const register maxCounter : int := 100
procedure p ( register x : real )
…
end p
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| Details | Items can be requested to be in registers only if they are local to a subprogram (not global variables, declared in the main program, a module, monitor or class). Items requested to be in registers cannot be bound to, passed to reference parameters, have their address taken by addr, or have certain type cheats applied to them (since a machine register has no address). The request to use a register may be ignored. For example, the current (1999) interpretive implementation uses pseudo-code, which has no machine registers, and so ignores the register keyword. For the syntax of using this keyword, see var declaration, const declaration and paramDeclaration.
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