Register

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The modifier register belongs to the calling conventions of internal and external subroutines.
The modifier register is for compatibility with Delphi.
The modifier has been supported since FPC 1.9.x.
The modifier register is used to call the first three parameters in the register.

Example:

function subTest: string; [register];
begin
   subTest: = 'abc';
end;

Example 2:

function funcTest (strTestdaten: Pchar): LongWord; register; external 'Test.dll';

--Translated from German by Mahdix18