Sergey,

On 21.08.2024 11:58, Sergey Kaplun wrote:
> This patch moves the aforementioned test to the <trace/wbarrier.lua>
> test, with refactoring to restore the JIT engine and GC settings after
> the test.
>
> Part of tarantool/tarantool#9398
> ---
thanks for the patch! LGTM
>   test/LuaJIT-tests/misc/wbarrier_obar.lua | 22 -------------
>   test/LuaJIT-tests/trace/wbarrier.lua     | 41 ++++++++++++++++++++++++
>   2 files changed, 41 insertions(+), 22 deletions(-)
>   delete mode 100644 test/LuaJIT-tests/misc/wbarrier_obar.lua
>
> diff --git a/test/LuaJIT-tests/misc/wbarrier_obar.lua b/test/LuaJIT-tests/misc/wbarrier_obar.lua
> deleted file mode 100644
> index 258db215..00000000
> --- a/test/LuaJIT-tests/misc/wbarrier_obar.lua
> +++ /dev/null
> @@ -1,22 +0,0 @@
> --- DSE of USTORE must eliminate OBAR, too.
> -
> -if jit and jit.opt then pcall(jit.opt.start, "-sink") end
> -
> -local f
> -do
> -  local x
> -  f = function()
> -    local y = 0
> -    for i=1,10000 do
> -      x = {1}
> -      if y > 0 then end
> -      x = 1
> -    end
> -  end
> -end
> -
> -collectgarbage()
> -collectgarbage("setstepmul", 1)
> -collectgarbage("restart")
> -f()
> -
> diff --git a/test/LuaJIT-tests/trace/wbarrier.lua b/test/LuaJIT-tests/trace/wbarrier.lua
> index 625c0ff2..9c9c50af 100644
> --- a/test/LuaJIT-tests/trace/wbarrier.lua
> +++ b/test/LuaJIT-tests/trace/wbarrier.lua
> @@ -1,3 +1,12 @@
> +local function jit_opt_is_on(needed)
> +  for _, opt in ipairs({jit.status()}) do
> +    if opt == needed then
> +      return true
> +    end
> +  end
> +  return false
> +end
> +
>   do --- TBAR for HSTORE.
>     local t = {[0]={}}
>     for i = 1, 1e5 do t[i] = {t[i - 1]} end
> @@ -14,3 +23,35 @@ do --- OBAR for USTORE.
>     end
>     f()
>   end
> +
> +do --- DSE of USTORE must eliminate OBAR too.
> +  local need_restore_sink = false
> +  if jit_opt_is_on("sink") then
> +    need_restore_sink = true
> +    jit.opt.start("-sink")
> +  end
> +
> +  local f
> +  do
> +    local x
> +    f = function()
> +      local y = 0
> +      for _ = 1, 10000 do
> +        x = {1}
> +        if y > 0 then end
> +        x = 1
> +      end
> +    end
> +  end
> +
> +  collectgarbage()
> +  local oldstepmul = collectgarbage("setstepmul", 1)
> +  collectgarbage("restart")
> +
> +  f()
> +
> +  collectgarbage("setstepmul", oldstepmul)
> +  if need_restore_sink then
> +    jit.opt.start("+sink")
> +  end
> +end