Commits on Jul 23, 2022

1. Simplify the loop for parsing Integer string …

   There are several branches in the loop that parse Integer string.
   In order to speed up parsing, this patch will move unwanted branches out of the loop.
   
   −       | before | after  | result
   --       | --     | --     | --
   integer  | 4.860M | 5.088M | 1.045x
   float    | 4.845M | 5.084M | 1.049x
   
   ### Environment
   - Linux
     - Manjaro Linux x86_64
     - Kernel: 5.18.12-3-MANJARO
     - AMD Ryzen 7 5700G
     - gcc version 12.1.0
     - Ruby 3.1.2
   
   ### Before
   ```
   Warming up --------------------------------------
        Oj.load integer   488.037k i/100ms
          Oj.load float   485.863k i/100ms
   Calculating -------------------------------------
        Oj.load integer      4.860M (± 0.1%) i/s -     48.804M in  10.042684s
          Oj.load float      4.845M (± 0.3%) i/s -     48.586M in  10.028592s
   ```
   
   ### After
   ```
   Warming up --------------------------------------
        Oj.load integer   508.044k i/100ms
          Oj.load float   508.281k i/100ms
   Calculating -------------------------------------
        Oj.load integer      5.088M (± 0.2%) i/s -     51.312M in  10.085310s
          Oj.load float      5.084M (± 0.2%) i/s -     51.336M in  10.098332s
   ```
   
   ### Test code
   ```ruby
   require 'benchmark/ips'
   require 'oj'
   
   Benchmark.ips do |x|
     x.warmup = 3
     x.time = 10
   
     json_integer = Oj.dump(2 ** 30)
     x.report('Oj.load integer') do |times|
       i = 0
       while i < times
         Oj.load(json_integer)
         i += 1
       end
     end
   
     json_float = Oj.dump(1234.123456789)
     x.report('Oj.load float') do |times|
       i = 0
       while i < times
         Oj.load(json_integer)
         i += 1
       end
     end
   end
   ```

   

   Watson1978 committed Jul 23, 2022
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