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Allow JIT compilation on arm/arm64.

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This commit is contained in:
Sasha Szpakowski
2025-11-05 22:42:48 -04:00
parent 43e3a7f218
commit fc42127510
1 changed files with 3 additions and 39 deletions
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src/modules/love/jitsetup.lua
+3 -39
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@@ -29,47 +29,11 @@ end
-- Double the defaults.
jit.opt.start("maxtrace=2000", "maxrecord=8000")
-- Somewhat arbitrary value. Needs to be higher than the combined sizes below,
-- and higher than the default (512) because that's already too low.
-- Somewhat arbitrary value.
jit.opt.start("maxmcode=16384")
if jit.arch == "arm64" or jit.arch == "arm" then
-- https://github.com/LuaJIT/LuaJIT/issues/285
-- LuaJIT 2.1 on arm(64) currently (as of commit b4b2dce) can only use memory
-- for JIT compilation within a certain short range. Other libraries such as
-- SDL can take all the usable space in that range and cause attempts at JIT
-- compilation to both fail and take a long time.
-- This is a very hacky attempt at a workaround. LuaJIT allocates executable
-- code in pools. We'll try "reserving" pools before any external code is
-- executed, by causing JIT compilation via a small loop. We can't easily
-- tell if JIT compilation succeeded, so we do several successively smaller
-- pool allocations in case previous ones fail.
-- This is a really hacky hack and by no means foolproof - there are a lot of
-- potential situations (especially when threads are used) where previously
-- executed external code will still take up space that LuaJIT needed for itself.
jit.opt.start("sizemcode=2048")
for i=1, 100 do end
jit.opt.start("sizemcode=1024")
for i=1, 100 do end
jit.opt.start("sizemcode=512")
for i=1, 100 do end
jit.opt.start("sizemcode=256")
for i=1, 100 do end
jit.opt.start("sizemcode=128")
for i=1, 100 do end
-- Actually just turn the whole thing off for arm(64). It's very hard to get
-- reliable performance in non-trivial games even with the above workaround.
jit.off()
else
-- Somewhat arbitrary value (>= the default).
jit.opt.start("sizemcode=128")
end
-- Somewhat arbitrary value (>= the default).
jit.opt.start("sizemcode=128")
-- DO NOT REMOVE THE NEXT LINE. It is used to load this file as a C++ string.
--)luastring"--"