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Make JIT-ed leave insn leaf

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to eliminate sp / pc moves by cancelling JIT execution on interrupts.

$ benchmark-driver benchmark.yml -v --rbenv 'before --jit;after --jit' --repeat-count=12 --output=all
before --jit: ruby 2.8.0dev (2020-04-01T03:48:56Z master 5a81562dfe) +JIT [x86_64-linux]
after --jit: ruby 2.8.0dev (2020-04-01T04:58:01Z master 39beb26a27) +JIT [x86_64-linux]
Calculating -------------------------------------
                                 before --jit           after --jit
Optcarrot Lan_Master.nes    75.06409603894944     76.06422026555558 fps
                            75.12025067279242     78.48161731616810
                            77.42020273492177     79.78958240950033
                            79.07253675128945     79.88645902325614
                            79.99179109732327     80.33743931749331
                            80.07633091008627     80.53790081529166
                            80.15450942667547     80.99048270668010
                            80.48372803283709     81.70497146081003
                            80.57410149187352     82.79494539467382
                            81.80449157081202     82.85797792223954
                            82.24629397834902     83.00603891515506
                            82.63708148686703     83.23221006969828

$ benchmark-driver -v --rbenv 'before;before --jit;after --jit' benchmark/mjit_leave.yml --repeat-count=4
before: ruby 2.8.0dev (2020-04-01T03:48:56Z master 5a81562dfe) [x86_64-linux]
before --jit: ruby 2.8.0dev (2020-04-01T03:48:56Z master 5a81562dfe) +JIT [x86_64-linux]
after --jit: ruby 2.8.0dev (2020-04-01T04:58:01Z master 39beb26a27) +JIT [x86_64-linux]
Calculating -------------------------------------
                         before  before --jit  after --jit
          mjit_leave   106.656M       82.786M      91.635M i/s -    200.000M times in 1.875183s 2.415881s 2.182569s

Comparison:
                       mjit_leave
              before: 106656239.9 i/s
         after --jit:  91635143.7 i/s - 1.16x  slower
        before --jit:  82785537.2 i/s - 1.29x  slower
This commit is contained in:
Takashi Kokubun 2020-03-31 21:58:01 -07:00
parent 5a81562dfe
commit 151f8be40d
No known key found for this signature in database
GPG key ID: 6FFC433B12EE23DD
2 changed files with 22 additions and 5 deletions
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7
benchmark/mjit_leave.yml Normal file
View file

@ -0,0 +1,7 @@
prelude: |
def leave
nil
end
benchmark:
mjit_leave: leave
loop_count: 200000000

16
tool/ruby_vm/views/mjit_compile.inc.erb
View file

@ -70,12 +70,22 @@ switch (insn) {
fprintf(stderr, "MJIT warning: Unexpected JIT stack_size on leave: %d\n", b->stack_size);
status->success = false;
}
% # Special leave for an inlined call.
if (status->inlined_iseqs == NULL) { // the current ISeq is being inlined
% # Skip vm_pop_frame for inlined call
if (status->inlined_iseqs != NULL) { // the current ISeq is NOT being inlined
% # Cancel on interrupts to make leave insn leaf
fprintf(f, " if (UNLIKELY(RUBY_VM_INTERRUPTED_ANY(ec))) {\n");
if (status->local_stack_p) {
fprintf(f, " reg_cfp->sp = vm_base_ptr(reg_cfp) + %d;\n", b->stack_size);
}
fprintf(f, " reg_cfp->pc = original_body_iseq + %d;\n", pos);
fprintf(f, " goto cancel;\n");
fprintf(f, " }\n");
fprintf(f, " ec->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(reg_cfp);\n"); // vm_pop_frame
}
fprintf(f, " return stack[0];\n");
b->stack_size += <%= insn.call_attribute('sp_inc') %>;
b->finish_p = TRUE;
break;
}
% end
%
% # Main insn implementation generated by insns.def