On 27/03/2023 09:28, Matias Ezequiel Vara Larsen via fpc-pascal wrote:
Apologies in the case this subject has been already discussed. I require
that some global variables be cache-line aligned. This is a requirement
for per-CPU variables that are statically defined to prevent cache
ping-pong. Is there any way to do this at fpc when the record is
declared?
{$push}
{$codealign varmin=16}
{$codealign constmin=16}
const
constdata: array[0..3] of longint = (1,2,3,4);
var
x: array[0..15] of longint;
{$pop}
However, the maximum alignment you can specify this way is limited per
target (hardcoded in the compiler). In 3.2.x, it's 16 bytes for most
desktop targets. On 3.3.x, it's 64 bytes for most desktop targets.
Jonas
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