[ruby-core:100274] [Ruby master Feature#17135] Improve performance of Integer#size method

Issue #17135 has been updated by shyouhei (Shyouhei Urabe).


ko1 (Koichi Sasada) wrote in #note-6:
> shyouhei (Shyouhei Urabe) wrote in #note-3:
> > The patch looks good to me.  HOWEVER, let me -1 this.
> > Integer#size HAS to be as fast as what is proposed here, without any extra hustle like this.
> > @ko1 any idea what is preventing it from running smoothly?
> 
> what is the "extra hustle"?

The proposed patch is basically `Primitive.cexpr! 'int_size(self)'`.  Why it must be faster than `rb_define_method(rb_cInteger, "size", int_size, 0)`?  They should at least perform identically.

----------------------------------------
Feature #17135: Improve performance of Integer#size method
https://bugs.ruby-lang.org/issues/17135#change-87861

* Author: S_H_ (Shun Hiraoka)
* Status: Assigned
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
----------------------------------------
`Integer#size` seems to show improved performance when written in ruby.

benchmark:

```yml
prelude: |
  n = 42
benchmark:
  size: |
    n.size
loop_count: 20000000
```

result:

```bash
sh@MyComputer:~/rubydev/build$ make benchmark/integer_size.yml -e COMPARE_RUBY=~/.rbenv/shims/ruby -e BENCH_RUBY=../install/bin/ruby
# Iteration per second (i/s)

|      |compare-ruby|built-ruby|
|:-----|-----------:|---------:|
|size  |     65.749M|   87.117M|
|      |           -|     1.33x|
```

`COMPARE_RUBY` is `ruby 2.8.0dev (2020-08-28T10:47:29Z master 7e1fddba4a) [x86_64-linux]`. `BENCH_RUBY` is patched.


pull request:
https://github.com/ruby/ruby/pull/3476



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