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ZJIT: Optimize variadic cfunc Send calls into CCallVariadic#14898

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st0012 merged 1 commit intoruby:masterfrom
Shopify:zjit-optimize-send-variadic
Dec 1, 2025
Merged

ZJIT: Optimize variadic cfunc Send calls into CCallVariadic#14898
st0012 merged 1 commit intoruby:masterfrom
Shopify:zjit-optimize-send-variadic

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@st0012 st0012 commented Oct 21, 2025 •
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Similar to SendWithoutBlock, this should eliminate most of the remaining unoptimized cfucc send.

This PR removes send_cfunc_variadic: 2,178,105 ( 4.6%) from Lobsters' send fallback reasons.

Closes Shopify#825

Lobsters Before

Top-16 send fallback reasons (100.0% of total 47,268,771):
                          send_without_block_polymorphic: 20,390,289 (43.1%)
                                           uncategorized:  7,199,864 (15.2%)
                          send_without_block_no_profiles:  4,912,054 (10.4%)
                          send_not_optimized_method_type:  3,507,220 ( 7.4%)
                                        send_no_profiles:  3,312,755 ( 7.0%)
                            one_or_more_complex_arg_pass:  3,087,629 ( 6.5%)
                                     send_cfunc_variadic:  2,178,105 ( 4.6%)
  send_without_block_not_optimized_method_type_optimized:    996,869 ( 2.1%)
                                        send_polymorphic:    730,950 ( 1.5%)
                          send_without_block_megamorphic:    678,490 ( 1.4%)
                                   too_many_args_for_lir:    172,280 ( 0.4%)
                 send_without_block_cfunc_array_variadic:     35,486 ( 0.1%)
                                        send_megamorphic:     28,623 ( 0.1%)
                                obj_to_string_not_string:     25,487 ( 0.1%)
            send_without_block_not_optimized_method_type:     11,049 ( 0.0%)
                          ccall_with_frame_too_many_args:      1,621 ( 0.0%)
Details 
Top-20 not inlined C methods (55.4% of total 16,729,627):
                                                 Hash#[]=: 1,518,600 ( 9.1%)
                                               Hash#fetch: 1,204,876 ( 7.2%)
                                            Regexp#match?:   807,872 ( 4.8%)
                                                Hash#key?:   731,104 ( 4.4%)
                                           Array#include?:   496,469 ( 3.0%)
                                              String#sub!:   482,035 ( 2.9%)
                                               Kernel#dup:   430,963 ( 2.6%)
                                                String#<<:   396,049 ( 2.4%)
                                       String#start_with?:   376,726 ( 2.3%)
                               ObjectSpace::WeakKeyMap#[]:   356,654 ( 2.1%)
                                              Hash#delete:   326,490 ( 2.0%)
                                               String.new:   306,747 ( 1.8%)
                                             Kernel#is_a?:   296,037 ( 1.8%)
                                             Set#include?:   260,425 ( 1.6%)
                                    Process.clock_gettime:   228,138 ( 1.4%)
                                            String#match?:   226,352 ( 1.4%)
                                          String#downcase:   215,957 ( 1.3%)
                                              Integer#<=>:   204,498 ( 1.2%)
                                            Range#member?:   203,067 ( 1.2%)
                                          String#include?:   193,214 ( 1.2%)
Top-20 calls to C functions from JIT code (80.8% of total 139,927,686):
                             rb_vm_opt_send_without_block: 30,379,267 (21.7%)
                                rb_vm_setinstancevariable: 11,384,692 ( 8.1%)
                                             rb_hash_aref: 10,515,536 ( 7.5%)
                                rb_vm_getinstancevariable: 10,268,755 ( 7.3%)
                                               rb_vm_send:  9,758,456 ( 7.0%)
                                          rb_vm_env_write:  8,257,283 ( 5.9%)
                                        rb_obj_is_kind_of:  5,833,876 ( 4.2%)
                                        rb_vm_invokesuper:  4,671,672 ( 3.3%)
                                              rb_ivar_get:  3,846,072 ( 2.7%)
                                             rb_ary_entry:  3,577,586 ( 2.6%)
                               rb_vm_opt_getconstant_path:  2,110,775 ( 1.5%)
                                        rb_vm_invokeblock:  1,672,171 ( 1.2%)
                                              rb_ary_push:  1,546,708 ( 1.1%)
                                                 Hash#[]=:  1,518,600 ( 1.1%)
                                       rb_gc_writebarrier:  1,510,300 ( 1.1%)
                                        rb_str_buf_append:  1,383,432 ( 1.0%)
                                          rb_ary_new_capa:  1,372,111 ( 1.0%)
                               rb_class_allocate_instance:  1,226,136 ( 0.9%)
                                               Hash#fetch:  1,204,876 ( 0.9%)
                                                    _bi20:    997,172 ( 0.7%)
Top-2 not optimized method types for send (100.0% of total 3,507,220):
  iseq: 3,504,398 (99.9%)
  null:     2,822 ( 0.1%)
Top-4 not optimized method types for send_without_block (100.0% of total 1,007,918):
        optimized_send: 531,555 (52.7%)
        optimized_call: 461,015 (45.7%)
                  null:  11,049 ( 1.1%)
  optimized_block_call:   4,299 ( 0.4%)
Top-4 instructions with uncategorized fallback reason (100.0% of total 7,199,864):
             invokesuper: 4,671,672 (64.9%)
             invokeblock: 1,672,171 (23.2%)
             sendforward:   787,205 (10.9%)
  opt_send_without_block:    68,816 ( 1.0%)
Top-16 send fallback reasons (100.0% of total 47,268,771):
                          send_without_block_polymorphic: 20,390,289 (43.1%)
                                           uncategorized:  7,199,864 (15.2%)
                          send_without_block_no_profiles:  4,912,054 (10.4%)
                          send_not_optimized_method_type:  3,507,220 ( 7.4%)
                                        send_no_profiles:  3,312,755 ( 7.0%)
                            one_or_more_complex_arg_pass:  3,087,629 ( 6.5%)
                                     send_cfunc_variadic:  2,178,105 ( 4.6%)
  send_without_block_not_optimized_method_type_optimized:    996,869 ( 2.1%)
                                        send_polymorphic:    730,950 ( 1.5%)
                          send_without_block_megamorphic:    678,490 ( 1.4%)
                                   too_many_args_for_lir:    172,280 ( 0.4%)
                 send_without_block_cfunc_array_variadic:     35,486 ( 0.1%)
                                        send_megamorphic:     28,623 ( 0.1%)
                                obj_to_string_not_string:     25,487 ( 0.1%)
            send_without_block_not_optimized_method_type:     11,049 ( 0.0%)
                          ccall_with_frame_too_many_args:      1,621 ( 0.0%)
Top-6 invokeblock handler (100.0% of total 1,672,171):
        polymorphic: 838,375 (50.1%)
   monomorphic_iseq: 711,922 (42.6%)
  monomorphic_other:  58,125 ( 3.5%)
  monomorphic_ifunc:  55,504 ( 3.3%)
        megamorphic:   4,316 ( 0.3%)
        no_profiles:   3,929 ( 0.2%)
Top-9 popular complex argument-parameter features not optimized (100.0% of total 3,352,928):
       caller_kwarg: 827,686 (24.7%)
           param_kw: 758,802 (22.6%)
        param_block: 660,358 (19.7%)
  param_forwardable: 658,707 (19.6%)
         param_rest: 286,679 ( 8.6%)
       param_kwrest: 122,633 ( 3.7%)
       caller_splat:  36,665 ( 1.1%)
    caller_blockarg:     803 ( 0.0%)
    caller_kw_splat:     595 ( 0.0%)
Top-1 compile error reasons (100.0% of total 248,252):
  exception_handler: 248,252 (100.0%)
Top-7 unhandled YARV insns (100.0% of total 189,091):
       getblockparam: 102,212 (54.1%)
  invokesuperforward:  81,665 (43.2%)
       setblockparam:   2,837 ( 1.5%)
         getconstant:   1,594 ( 0.8%)
         expandarray:     360 ( 0.2%)
          checkmatch:     298 ( 0.2%)
                once:     125 ( 0.1%)
Top-4 unhandled HIR insns (100.0% of total 299,542):
          throw: 256,478 (85.6%)
  invokebuiltin:  35,372 (11.8%)
     fixnum_div:   4,971 ( 1.7%)
      array_max:   2,721 ( 0.9%)
Top-18 side exit reasons (100.0% of total 14,297,101):
                   guard_type_failure: 7,013,938 (49.1%)
                  guard_shape_failure: 4,329,505 (30.3%)
  block_param_proxy_not_iseq_or_ifunc: 1,228,950 ( 8.6%)
     patchpoint_stable_constant_names:   415,818 ( 2.9%)
                   unhandled_hir_insn:   299,542 ( 2.1%)
                        compile_error:   248,252 ( 1.7%)
        patchpoint_no_singleton_class:   245,187 ( 1.7%)
          patchpoint_method_redefined:   209,714 ( 1.5%)
                  unhandled_yarv_insn:   189,091 ( 1.3%)
                 fixnum_mult_overflow:    50,739 ( 0.4%)
           block_param_proxy_modified:    28,111 ( 0.2%)
         unhandled_newarray_send_pack:    14,481 ( 0.1%)
               fixnum_lshift_overflow:    10,085 ( 0.1%)
              patchpoint_no_ep_escape:     7,821 ( 0.1%)
             guard_bit_equals_failure:     4,533 ( 0.0%)
               obj_to_string_fallback:     1,177 ( 0.0%)
                            interrupt:       135 ( 0.0%)
               guard_type_not_failure:        22 ( 0.0%)
                             send_count: 151,198,032
                     dynamic_send_count:  47,268,771 (31.3%)
                   optimized_send_count: 103,929,261 (68.7%)
              iseq_optimized_send_count:  38,251,427 (25.3%)
      inline_cfunc_optimized_send_count:  42,451,304 (28.1%)
       inline_iseq_optimized_send_count:   3,790,279 ( 2.5%)
non_variadic_cfunc_optimized_send_count:  13,393,046 ( 8.9%)
    variadic_cfunc_optimized_send_count:   6,043,205 ( 4.0%)
dynamic_getivar_count:                       14,114,827
dynamic_setivar_count:                       11,439,455
compiled_iseq_count:                              5,273
failed_iseq_count:                                    0
compile_time:                                  15,638ms
profile_time:                                      67ms
gc_time:                                           58ms
invalidation_time:                                338ms
vm_write_pc_count:                          139,923,653
vm_write_sp_count:                          191,568,126
vm_write_locals_count:                      134,357,340
vm_write_stack_count:                       134,357,340
vm_write_to_parent_iseq_local_count:            548,930
vm_read_from_parent_iseq_local_count:        15,139,490
guard_type_count:                           151,921,176
guard_type_exit_ratio:                             4.6%
guard_shape_count:                           48,021,720
guard_shape_exit_ratio:                            9.0%
code_region_bytes:                           38,240,256
zjit_alloc_bytes:                            19,995,236
total_mem_bytes:                             58,235,492
side_exit_count:                             14,297,101
total_insn_count:                           930,885,233
vm_insn_count:                              155,775,123
zjit_insn_count:                            775,110,110
ratio_in_zjit:                                    83.3%

Lobsters After

Top-15 send fallback reasons (100.0% of total 45,095,904):
                          send_without_block_polymorphic: 20,390,333 (45.2%)
                                           uncategorized:  7,199,910 (16.0%)
                          send_without_block_no_profiles:  4,912,063 (10.9%)
                          send_not_optimized_method_type:  3,507,220 ( 7.8%)
                                        send_no_profiles:  3,312,754 ( 7.3%)
                            one_or_more_complex_arg_pass:  3,092,766 ( 6.9%)
  send_without_block_not_optimized_method_type_optimized:    996,869 ( 2.2%)
                                        send_polymorphic:    730,950 ( 1.6%)
                          send_without_block_megamorphic:    678,490 ( 1.5%)
                                   too_many_args_for_lir:    172,282 ( 0.4%)
                 send_without_block_cfunc_array_variadic:     35,487 ( 0.1%)
                                        send_megamorphic:     28,623 ( 0.1%)
                                obj_to_string_not_string:     25,487 ( 0.1%)
            send_without_block_not_optimized_method_type:     11,049 ( 0.0%)
                          ccall_with_frame_too_many_args:      1,621 ( 0.0%)
Details 
Top-20 not inlined C methods (57.5% of total 18,902,628):
                                               Hash#fetch: 2,651,243 (14.0%)
                                                 Hash#[]=: 1,518,604 ( 8.0%)
                                            Regexp#match?:   807,876 ( 4.3%)
                                                Hash#key?:   731,105 ( 3.9%)
                                           Array#include?:   496,469 ( 2.6%)
                                              String#sub!:   482,035 ( 2.6%)
                                               Kernel#dup:   430,963 ( 2.3%)
                                                String#<<:   396,049 ( 2.1%)
                                       String#start_with?:   376,732 ( 2.0%)
                               ObjectSpace::WeakKeyMap#[]:   356,654 ( 1.9%)
                                              Hash#delete:   326,490 ( 1.7%)
                                               Array#any?:   308,993 ( 1.6%)
                                               String.new:   306,747 ( 1.6%)
                                             Kernel#is_a?:   296,040 ( 1.6%)
                                             Set#include?:   260,424 ( 1.4%)
                                               Array#all?:   253,438 ( 1.3%)
                                    Process.clock_gettime:   228,138 ( 1.2%)
                                            String#match?:   226,352 ( 1.2%)
                                          String#downcase:   215,960 ( 1.1%)
                                              Integer#<=>:   204,498 ( 1.1%)
Top-20 calls to C functions from JIT code (79.5% of total 139,927,922):
                             rb_vm_opt_send_without_block: 30,379,325 (21.7%)
                                rb_vm_setinstancevariable: 11,384,704 ( 8.1%)
                                             rb_hash_aref: 10,515,544 ( 7.5%)
                                rb_vm_getinstancevariable: 10,268,760 ( 7.3%)
                                          rb_vm_env_write:  8,257,298 ( 5.9%)
                                               rb_vm_send:  7,585,485 ( 5.4%)
                                        rb_obj_is_kind_of:  5,833,878 ( 4.2%)
                                        rb_vm_invokesuper:  4,671,675 ( 3.3%)
                                              rb_ivar_get:  3,846,072 ( 2.7%)
                                             rb_ary_entry:  3,577,603 ( 2.6%)
                               rb_vm_opt_getconstant_path:  2,110,776 ( 1.5%)
                                        rb_vm_invokeblock:  1,672,214 ( 1.2%)
                                              rb_ary_push:  1,546,718 ( 1.1%)
                                                 Hash#[]=:  1,518,604 ( 1.1%)
                                       rb_gc_writebarrier:  1,510,301 ( 1.1%)
                                                    fetch:  1,446,363 ( 1.0%)
                                        rb_str_buf_append:  1,383,436 ( 1.0%)
                                          rb_ary_new_capa:  1,372,117 ( 1.0%)
                               rb_class_allocate_instance:  1,226,139 ( 0.9%)
                                               Hash#fetch:  1,204,880 ( 0.9%)
Top-2 not optimized method types for send (100.0% of total 3,507,220):
  iseq: 3,504,398 (99.9%)
  null:     2,822 ( 0.1%)
Top-4 not optimized method types for send_without_block (100.0% of total 1,007,918):
        optimized_send: 531,555 (52.7%)
        optimized_call: 461,015 (45.7%)
                  null:  11,049 ( 1.1%)
  optimized_block_call:   4,299 ( 0.4%)
Top-4 instructions with uncategorized fallback reason (100.0% of total 7,199,910):
             invokesuper: 4,671,675 (64.9%)
             invokeblock: 1,672,214 (23.2%)
             sendforward:   787,205 (10.9%)
  opt_send_without_block:    68,816 ( 1.0%)
Top-15 send fallback reasons (100.0% of total 45,095,904):
                          send_without_block_polymorphic: 20,390,333 (45.2%)
                                           uncategorized:  7,199,910 (16.0%)
                          send_without_block_no_profiles:  4,912,063 (10.9%)
                          send_not_optimized_method_type:  3,507,220 ( 7.8%)
                                        send_no_profiles:  3,312,754 ( 7.3%)
                            one_or_more_complex_arg_pass:  3,092,766 ( 6.9%)
  send_without_block_not_optimized_method_type_optimized:    996,869 ( 2.2%)
                                        send_polymorphic:    730,950 ( 1.6%)
                          send_without_block_megamorphic:    678,490 ( 1.5%)
                                   too_many_args_for_lir:    172,282 ( 0.4%)
                 send_without_block_cfunc_array_variadic:     35,487 ( 0.1%)
                                        send_megamorphic:     28,623 ( 0.1%)
                                obj_to_string_not_string:     25,487 ( 0.1%)
            send_without_block_not_optimized_method_type:     11,049 ( 0.0%)
                          ccall_with_frame_too_many_args:      1,621 ( 0.0%)
Top-6 invokeblock handler (100.0% of total 1,672,214):
        polymorphic: 838,385 (50.1%)
   monomorphic_iseq: 711,954 (42.6%)
  monomorphic_other:  58,125 ( 3.5%)
  monomorphic_ifunc:  55,505 ( 3.3%)
        megamorphic:   4,316 ( 0.3%)
        no_profiles:   3,929 ( 0.2%)
Top-9 popular complex argument-parameter features not optimized (100.0% of total 3,358,065):
       caller_kwarg: 827,685 (24.6%)
           param_kw: 758,802 (22.6%)
        param_block: 660,358 (19.7%)
  param_forwardable: 658,711 (19.6%)
         param_rest: 286,678 ( 8.5%)
       param_kwrest: 122,633 ( 3.7%)
       caller_splat:  36,665 ( 1.1%)
    caller_blockarg:   5,938 ( 0.2%)
    caller_kw_splat:     595 ( 0.0%)
Top-1 compile error reasons (100.0% of total 248,252):
  exception_handler: 248,252 (100.0%)
Top-7 unhandled YARV insns (100.0% of total 189,091):
       getblockparam: 102,212 (54.1%)
  invokesuperforward:  81,665 (43.2%)
       setblockparam:   2,837 ( 1.5%)
         getconstant:   1,594 ( 0.8%)
         expandarray:     360 ( 0.2%)
          checkmatch:     298 ( 0.2%)
                once:     125 ( 0.1%)
Top-4 unhandled HIR insns (100.0% of total 299,542):
          throw: 256,478 (85.6%)
  invokebuiltin:  35,372 (11.8%)
     fixnum_div:   4,971 ( 1.7%)
      array_max:   2,721 ( 0.9%)
Top-18 side exit reasons (100.0% of total 14,297,048):
                   guard_type_failure: 7,013,941 (49.1%)
                  guard_shape_failure: 4,329,503 (30.3%)
  block_param_proxy_not_iseq_or_ifunc: 1,228,950 ( 8.6%)
     patchpoint_stable_constant_names:   415,818 ( 2.9%)
                   unhandled_hir_insn:   299,542 ( 2.1%)
                        compile_error:   248,252 ( 1.7%)
        patchpoint_no_singleton_class:   245,187 ( 1.7%)
          patchpoint_method_redefined:   209,714 ( 1.5%)
                  unhandled_yarv_insn:   189,091 ( 1.3%)
                 fixnum_mult_overflow:    50,739 ( 0.4%)
           block_param_proxy_modified:    28,111 ( 0.2%)
         unhandled_newarray_send_pack:    14,481 ( 0.1%)
               fixnum_lshift_overflow:    10,085 ( 0.1%)
              patchpoint_no_ep_escape:     7,821 ( 0.1%)
             guard_bit_equals_failure:     4,533 ( 0.0%)
               obj_to_string_fallback:     1,177 ( 0.0%)
                            interrupt:        81 ( 0.0%)
               guard_type_not_failure:        22 ( 0.0%)
                             send_count: 151,198,255
                     dynamic_send_count:  45,095,904 (29.8%)
                   optimized_send_count: 106,102,351 (70.2%)
              iseq_optimized_send_count:  38,251,459 (25.3%)
      inline_cfunc_optimized_send_count:  42,451,362 (28.1%)
       inline_iseq_optimized_send_count:   3,790,280 ( 2.5%)
non_variadic_cfunc_optimized_send_count:  13,393,061 ( 8.9%)
    variadic_cfunc_optimized_send_count:   8,216,189 ( 5.4%)
dynamic_getivar_count:                       14,114,832
dynamic_setivar_count:                       11,439,467
compiled_iseq_count:                              5,273
failed_iseq_count:                                    0
compile_time:                                  15,269ms
profile_time:                                      65ms
gc_time:                                           56ms
invalidation_time:                                378ms
vm_write_pc_count:                          139,923,859
vm_write_sp_count:                          199,784,568
vm_write_locals_count:                      134,357,529
vm_write_stack_count:                       134,357,529
vm_write_to_parent_iseq_local_count:            548,930
vm_read_from_parent_iseq_local_count:        15,139,506
guard_type_count:                           154,055,277
guard_type_exit_ratio:                             4.6%
guard_shape_count:                           48,021,695
guard_shape_exit_ratio:                            9.0%
code_region_bytes:                           38,420,480
zjit_alloc_bytes:                            19,997,861
total_mem_bytes:                             58,418,341
side_exit_count:                             14,297,048
total_insn_count:                           930,885,012
vm_insn_count:                              155,773,995
zjit_insn_count:                            775,111,017
ratio_in_zjit:                                    83.3%

st0012
st0012 commented Oct 21, 2025
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st0012
st0012 commented Oct 21, 2025
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zjit/src/hir.rs Outdated
@@ -12907,26 +12933,46 @@ mod opt_tests {
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@st0012 st0012 Oct 21, 2025

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I decided to not use Array#index because it only considers either the passed arg, or the block. And if you pass both, it'd warn about block not being used.

@launchable-app

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@st0012 st0012 force-pushed the zjit-optimize-send-variadic branch 2 times, most recently from 5691488 to 00e7889 Compare October 24, 2025 22:51
@st0012 st0012 force-pushed the zjit-optimize-send-variadic branch 2 times, most recently from 72f68f3 to 1186b4f Compare October 30, 2025 21:08
@k0kubun k0kubun mentioned this pull request Nov 10, 2025
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@st0012 st0012 force-pushed the zjit-optimize-send-variadic branch from 1186b4f to 555c8b2 Compare November 26, 2025 17:34
@st0012 st0012 force-pushed the zjit-optimize-send-variadic branch from 555c8b2 to 835ac10 Compare November 26, 2025 18:35
st0012
st0012 commented Nov 26, 2025
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zjit/src/codegen.rs
gen_stack_overflow_check(jit, asm, state, state.stack_size());

gen_prepare_non_leaf_call(jit, asm, state);
let args_with_recv_len = args.len() + 1;
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The math here is different than gen_ccall_with_frame's because CCallWithFrame doesn't have recv field. I think this is confusing so I'll add a recv to it in a separate PR to make things consistent.

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@st0012 st0012 Nov 26, 2025

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#15334

@st0012 st0012 marked this pull request as ready for review November 26, 2025 21:58
@matzbot matzbot requested a review from a team November 26, 2025 21:58
aidenfoxivey
aidenfoxivey reviewed Nov 27, 2025
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zjit/src/hir.rs
let ci_flags = unsafe { vm_ci_flag(call_info) };

// When seeing &block argument, fall back to dynamic dispatch for now
// TODO: Support block forwarding
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@aidenfoxivey aidenfoxivey Nov 27, 2025

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iirc, @tekknolagi suggested before that TODOs have to be specifically targeted to ensure that they have someone to follow up on.

Like todo(aidenfoxivey): foo bar baz. I could be wrong though.

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Hmm this is different then I'm aware of. I can create an issue for it though.

k0kubun
k0kubun approved these changes Dec 1, 2025
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👍

@st0012 st0012 merged commit c58970b into ruby:master Dec 1, 2025
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@st0012 st0012 deleted the zjit-optimize-send-variadic branch December 1, 2025 17:14
tagomoris pushed a commit to tagomoris/ruby that referenced this pull request Dec 2, 2025
@st0012 @tagomoris
ZJIT: Optimize variadic cfunc Send calls into CCallVariadic (ruby…
ab48879 
…#14898)

ZJIT: Optimize variadic cfunc Send calls into CCallVariadic
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@XrXr XrXr XrXr left review comments

@k0kubun k0kubun k0kubun approved these changes

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@aidenfoxivey aidenfoxivey aidenfoxivey left review comments

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Optimize variadic cfunc send

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@st0012 @k0kubun @XrXr @aidenfoxivey