One for Jonas mainly, but also for Florian. This is a new "extra
optimisation information" feature that allows the peephole optimizer to
leave 'notes' and other extra information on individual tai objects for
later reference. An initial showcase is to store a link to the
destination label if it's not available in the lookup table (becuase it
was created later by a peephole optimisation).
https://gitlab.com/freepascal.org/fpc/source/-/merge_requests/74/diffs
Currently the showcase doesn't appear to show any additional
optimisations in the x86-64 RTL because the jump optimisation that
creates a new label is almost never called.
I'll use this feature more extensively in the future, such as for
storing information on the values of registers or making a note of a
label that should be removed if possible because it would cause a
long-term optimisation (something that a peephole optimisation that
removes the label may not be able to determine because its own
optimisation is questionable without that information). See previous
e-mails in this chain for an example.
Gareth aka. Kit
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
_______________________________________________
fpc-devel maillist - fpc-devel@lists.freepascal.org
https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
