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Bram Moolenaar
2021-07-28 20:10:16 +02:00
parent 327d3ee455
commit 53f7fccc94
33 changed files with 804 additions and 353 deletions
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README_VIM9.md
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@ -45,14 +45,16 @@ full code is below):
| Vim old | 5.018541 |
| Python | 0.369598 |
| Lua | 0.078817 |
| LuaJit | 0.004245 |
| Vim new | 0.073595 |
That looks very promising! It's just one example, but it shows how much
we can gain, and also that Vim script can be faster than builtin
interfaces.
In practice the script would not do something useless as counting but change
the text. For example, reindent all the lines:
LuaJit is much faster at Lua-only instructions. In practice the script would
not do something useless as counting but change the text. For example,
reindent all the lines:
``` vim
let totallen = 0
@ -64,13 +66,17 @@ the text. For example, reindent all the lines:
| how | time in sec |
| --------| -------- |
| Vim old | 0.853752 |
| Python | 0.304584 |
| Lua | 0.286573 |
| Vim new | 0.190276 |
| Vim old | 0.578598 |
| Python | 0.152040 |
| Lua | 0.164917 |
| LuaJit | 0.128400 |
| Vim new | 0.079692 |
[These times were measured on a different system by Dominique Pelle]
The differences are smaller, but Vim 9 script is clearly the fastest.
Using LuaJIT gives 0.25, only a little bit faster than plain Lua.
Using LuaJIT is only a little bit faster than plain Lua here, clearly the call
back to the Vim code is costly.
How does Vim9 script work? The function is first compiled into a sequence of
instructions. Each instruction has one or two parameters and a stack is