> Am 11.10.2021 um 10:00 schrieb J. Gareth Moreton via fpc-devel > <fpc-devel@lists.freepascal.org>: > > 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.
I fear a little bit that this extra info is messed up when instructions are added/removed. _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
