Add str_from_int function

[Robyt3]

Add more efficient function for formatting integer values as strings.

A benchmark shows that using this function is significantly faster than using str_format. It is faster by a factor of 220 with Clang 15.0 O2 (https://quick-bench.com/q/BlNoLnlyqxipf4jvsFTUxKMHDJU) and by a factor of 11 with GCC 12.2 O2 (https://quick-bench.com/q/Fxf9lDCTqXBF4pIa_IyZ5R0IqYg).

This increases FPS in the editor by ~25% when many numbers are rendered for switch/tele/speedup/tune layers or with "Show Info" being enabled.

The additional static analysis for std::to_chars revealed that the wrong size was used in CHud for aScoreTeam[TEAM_RED] and aScoreTeam[TEAM_BLUE].

This requires incrementing the macOS deployment target from 10.13 to 10.15.

Checklist

• Tested the change ingame
• Provided screenshots if it is a visual change
• Tested in combination with possibly related configuration options
• Written a unit test (especially base/) or added coverage to integration test
• Considered possible null pointers and out of bounds array indexing
• Changed no physics that affect existing maps
• Tested the change with ASan+UBSan or valgrind's memcheck (optional)

[heinrich5991]

This increases FPS in the editor by ~25% when many numbers are rendered for switch/tele/speedup/tune layers or with "Show Info" being enabled.

That's very nice numbers. :o Thanks for pursuing this.

I wonder whether this could be made drop-in, i.e. check if the format parameter of str_format is "%d" and if so, call std::to_chars?

[Robyt3]

I wonder whether this could be made drop-in, i.e. check if the format parameter of str_format is "%d" and if so, call std::to_chars?

This would be 1.7x slower with GCC (https://quick-bench.com/q/zYJQrmQFwC6HUPagPduDs5ooqQ0) and 36x slower with Clang (https://quick-bench.com/q/D-aRHQtGDCCSPRNTFujS3W_2rYU).

We'd still need to use varargs, which is always slower than passing a single integer by value.

[Learath2]

How about a constexpr version of format? You might be able to match the performance that way

[heinrich5991]

Cool site! :o

The Clang benchmarks look moot, it inlined the function completely, i.e. it's no longer converting strings to ints in the benchmark at runtime.

We'd still need to use varargs, which is always slower than passing a single integer by value.

Even though this shouldn't™ be the case, it apparently is. I tried to look at it with godbolt and the compilers generated shitty code for variable args.

[heinrich5991]

How about a constexpr version of format? You might be able to match the performance that way

This will make compile times slower though, I don't think that's desirable.

[heinrich5991]

Looks good to me, thanks!