ZJIT: Specialize #[] into an rb_hash_aref call if a profiled type is Hash #793

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1. k0kubun commented on Oct 10, 2025

   

   k0kubun

   on Oct 10, 2025

   Last edited by k0kubun

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   ***ZJIT: Printing ZJIT statistics on exit***
   Top-20 not inlined C methods (77.1% of total 5,830,892):
                                       Hash#[]: 1,455,985 (25.0%)
                                 Class#current:   532,771 ( 9.1%)
                                      Array#[]:   499,244 ( 8.6%)
                                  Kernel#is_a?:   338,941 ( 5.8%)
                            String#start_with?:   319,621 ( 5.5%)
                                      Hash#[]=:   251,427 ( 4.3%)
                    ObjectSpace::WeakKeyMap#[]:   139,416 ( 2.4%)
                                    Array#any?:    94,804 ( 1.6%)
                            Kernel#respond_to?:    86,634 ( 1.5%)
                                   String#to_s:    81,629 ( 1.4%)
                                BasicObject#!=:    81,311 ( 1.4%)
                                   String#hash:    79,148 ( 1.4%)
                                 Regexp#match?:    79,038 ( 1.4%)
                           Kernel#block_given?:    78,830 ( 1.4%)
                          Module#clock_gettime:    74,657 ( 1.3%)
                       SQLite3::Statement#step:    62,187 ( 1.1%)
                      SQLite3::Statement#done?:    62,187 ( 1.1%)
                                 TrueClass#===:    60,357 ( 1.0%)
                                     Hash#key?:    59,816 ( 1.0%)
                                FalseClass#===:    58,667 ( 1.0%)
   

   This is the most frequently called (not dynamically dispatched or already inlined) C method on lobsters.
2. tekknolagi

   assigned

   tekknolagi

   and

   aidenfoxivey

   and unassigned

   tekknolagi

   on Oct 14, 2025
3. aidenfoxivey commented on Oct 14, 2025

   

   aidenfoxivey

   on Oct 14, 2025

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   Getting started on this now.
4. tekknolagi

   closed this as completedin ruby/ruby#14838on Oct 15, 2025
5. pull

   added a commit that references this issue on Oct 15, 2025

   ZJIT: Add HashAref to HIR and inline Hash#[] to HashAref (ruby#14838)

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   6a94632