LibretroAdmin 9140befd81 dynarec: room for the largest block, and a block that is already gone ...

A block is compiled if there are 16 KB left in the code cache. A block
is up to 511 operations, and with the MMU on a load or store can be over
a hundred bytes: upstream went to 32 KB after Tomb Raider: The Last
Revelation ran past 16 (f11a5981f). The largest block seen here is
10 KB, in Sega Rally 2, on x86-64 and on ARM64 alike. 64 KB now, of
16 MB: CODE_MARGIN, for the cache, the one for rewritten code and the
checks the recompilers make.

A build with NO_MMU had no cache for rewritten code at all
(TEMP_CODE_SIZE 0), and since such code is kept there with the MMU off
too would have been given a block to compile into it. No Makefile
defines NO_MMU; it has the megabyte the others have.

rdv_BlockCheckFail(), with the MMU on, used a block it had looked up
without asking whether there was one - there is none if what failed was
run once more after it was discarded. Upstream has the same check.

2026-10-10 14:38:17 +02:00

..

rec_cpp.cpp

dynarec: room for the largest block, and a block that is already gone

2026-10-10 14:38:17 +02:00