$A or $ALIGN : Align Data

1.1.1 $A or $ALIGN : Align Data

The {$ALIGN directive can be used to select the data alignment strategy of the compiler for records. It takes a numerical argument which can be 1, 2, 4, 8, 16 or 32, specifying the alignment boundary in bytes. For these values, it has the same effect as the {$PACKRECORDS} directive (see section 1.1.58, page 143).

Thus, the following

{$A 8}

is equivalent to

{$PACKRECORDS 8}

and specifies to the compiler that all data inside a record should be aligned on 8 byte boundaries.

In MACPAS mode, additionally it can have the following values:

MAC68K: Specifies alignment following the m68K ABI.
POWER: Specifies alignment following the PowerPC ABI.
POWERPC: Specifies alignment following the PowerPC ABI.
RESET: Resets the default alignment.
ON: Same as specifying 4.
OFF: Same as specifying 1.

These values are not available in the {$PACKRECORDS} directive.

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