Issue #18293 has been updated by k0kubun (Takashi Kokubun).


It seems like C -> builtin conversion makes method calls with keyword arguments faster, but C seems faster on method calls without keyword arguments if the method has keyword arguments (with default values).

```
$ benchmark-driver -v --rbenv '3.0.0;master::after' /tmp/a.yml
3.0.0: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin19]
master: ruby 3.1.0dev (2021-11-10T09:14:14Z master 8bcff5604b) [x86_64-darwin19]
Calculating -------------------------------------
                            3.0.0      master
            Time.at(0)     4.825M      4.025M i/s -     10.000M times in 2.072430s 2.484322s
Time.at(0, in: -"UTC")     1.388M      1.546M i/s -     10.000M times in 7.205443s 6.466879s

Comparison:
                         Time.at(0)
                 3.0.0:   4825253.4 i/s
                master:   4025243.1 i/s - 1.20x  slower

             Time.at(0, in: -"UTC")
                master:   1546341.0 i/s
                 3.0.0:   1387839.7 i/s - 1.11x  slower
```

----------------------------------------
Bug #18293: Time.at in master branch was 25% slower then Ruby 3.0
https://bugs.ruby-lang.org/issues/18293#change-94623

* Author: watson1978 (Shizuo Fujita)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.0dev (2021-11-08T13:15:21Z master bd2674ad33) [arm64-darwin21]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
¡Ý       | Ruby 3.0.2 | Ruby 3.1.0-dev | result
--       | --         | --             | --
Time.at  | 8.223M     | 6.190M         | 0.753x

### Environment
- MacBook Pro (14inch, 2021)
- macOS 12.0
- Apple M1 Max
- Apple clang version 13.0.0 (clang-1300.0.29.3)

### Ruby 3.1.0-dev
```
$ ruby -v time.rb
ruby 3.1.0dev (2021-11-08T13:15:21Z master bd2674ad33) [arm64-darwin21]
Warming up --------------------------------------
             Time.at   614.843k i/100ms
Calculating -------------------------------------
             Time.at      6.190M (¡Þ 0.3%) i/s -     31.357M in   5.065559s
```

### Ruby 3.0.2
```
$ ruby -v time.rb
ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [arm64-darwin21]
Warming up --------------------------------------
             Time.at   821.722k i/100ms
Calculating -------------------------------------
             Time.at      8.223M (¡Þ 0.6%) i/s -     41.908M in   5.096820s
```

### Test code
```ruby
require 'benchmark/ips'

Benchmark.ips do |x|
  x.report('Time.at') { Time.at(0) }
end
```

---Files--------------------------------
patch.diff (2.52 KB)


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