Hi, Igor! Thanks for the patch! LGTM, except for the two nits below.   >Четверг, 1 декабря 2022, 23:42 +03:00 от Igor Munkin : >  >JIT engine setup in tarantool-tests/lj-430-maxirconst.test.lua is too >tight for the build with LUAJIT_ENABLE_CHECKHOOK option enabled. >Originally test limits value with 3 for the default IRRef >constants set: nil, true, false. However, with LUAJIT_ENABLE_CHECKHOOK >enabled there are three more auxiliary IRRef constants for the internal >purposes. Hence, the test is reimplemented the following way: >* The first trace for the empty function is recorded >* The number of IRRef constants is obtained via >* parameter is set to this value >* The second trace for the function with a single local variable, >  initialized with a constant, fails to record > >As a result there is no need to explicitly respect any configuration. > >Relates to tarantool/tarantool#7762 > >Signed-off-by: Igor Munkin < imun@tarantool.org > >--- > .../lj-430-maxirconst.test.lua | 23 +++++++++++-------- > 1 file changed, 14 insertions(+), 9 deletions(-) > >diff --git a/test/tarantool-tests/lj-430-maxirconst.test.lua b/test/tarantool-tests/lj-430-maxirconst.test.lua >index cd3587a8..eaa0cd1b 100644 >--- a/test/tarantool-tests/lj-430-maxirconst.test.lua >+++ b/test/tarantool-tests/lj-430-maxirconst.test.lua >@@ -1,8 +1,3 @@ >--- XXX: avoid any other traces compilation due to hotcount >--- collisions for predictable results. >-jit.off() >-jit.flush() >- > -- Disabled on *BSD due to #4819. > require('utils').skipcond(jit.os == 'BSD', 'Disabled due to #4819') >  >@@ -12,10 +7,6 @@ local traceinfo = require('jit.util').traceinfo > local test = tap.test('lj-430-maxirconst') > test:plan(2) >  >--- XXX: trace always has at least 3 IR constants: for nil, false >--- and true. >-jit.opt.start('hotloop=1', 'maxirconst=3') >- > -- This function has only 3 IR constant. > local function irconst3() > end >@@ -25,6 +16,12 @@ local function irconst4() >   local _ = 42 > end >  >+-- XXX: Avoid any other traces compilation due to hotcount >+-- collisions for predictable results. >+jit.off() >+jit.flush() >+jit.opt.start('hotloop=1') >+ > assert(not traceinfo(1), 'no traces compiled after flush') > jit.on() > irconst3() >@@ -32,6 +29,14 @@ irconst3() > jit.off() > test:ok(traceinfo(1), 'new trace created') >  >+-- XXX: Trace 1 always has at least 3 IR constants: for nil, false >+-- and true. In case when LUAJIT_ENABLE_CHECKHOOK is set to ON, Typo: s/In case when/If/ >+-- three more constants are emitted to the trace. >+-- Tight up and try to record the next trace with one Typo: s/Tight up/Tighten up/ >+-- more constant to be emitted. >+jit.opt.start(('maxirconst=%d'):format(traceinfo(1).nk)) >+ >+assert(not traceinfo(2), 'only one trace is created to this moment') > jit.on() > irconst4() > irconst4() >-- >2.34.0 -- Best regards, Maxim Kokryashkin