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YJIT: Fallback megamorphic opt_case_dispatch (#9894)

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Takashi Kokubun 2024-02-09 09:12:45 -08:00 committed by GitHub
parent 80490acfb6
commit 717adb564b
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3 changed files with 11 additions and 3 deletions
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5
yjit.rb
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@ -323,8 +323,9 @@ module RubyVM::YJIT
out.puts "num_send_x86_rel32: " + format_number(13, stats[:num_send_x86_rel32])
out.puts "num_send_x86_reg: " + format_number(13, stats[:num_send_x86_reg])
end
out.puts "num_getivar_megamorphic: " + format_number(13, stats[:num_getivar_megamorphic])
out.puts "num_setivar_megamorphic: " + format_number(13, stats[:num_setivar_megamorphic])
out.puts "num_getivar_megamorphic: " + format_number(11, stats[:num_getivar_megamorphic])
out.puts "num_setivar_megamorphic: " + format_number(11, stats[:num_setivar_megamorphic])
out.puts "num_opt_case_megamorphic: " + format_number(10, stats[:num_opt_case_dispatch_megamorphic])
out.puts "num_throw: " + format_number(13, stats[:num_throw])
out.puts "num_throw_break: " + format_number_pct(13, stats[:num_throw_break], stats[:num_throw])
out.puts "num_throw_retry: " + format_number_pct(13, stats[:num_throw_retry], stats[:num_throw])

8
yjit/src/codegen.rs
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@ -4037,7 +4037,13 @@ fn gen_opt_case_dispatch(
all_fixnum
}
if comptime_key.fixnum_p() && comptime_key.0 <= u32::MAX.as_usize() && case_hash_all_fixnum_p(case_hash) {
// If megamorphic, fallback to compiling branch instructions after opt_case_dispatch
let megamorphic = asm.ctx.get_chain_depth() >= CASE_WHEN_MAX_DEPTH;
if megamorphic {
gen_counter_incr(asm, Counter::num_opt_case_dispatch_megamorphic);
}
if comptime_key.fixnum_p() && comptime_key.0 <= u32::MAX.as_usize() && case_hash_all_fixnum_p(case_hash) && !megamorphic {
if !assume_bop_not_redefined(jit, asm, ocb, INTEGER_REDEFINED_OP_FLAG, BOP_EQQ) {
return None;
}

1
yjit/src/stats.rs
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@ -592,6 +592,7 @@ make_counters! {
num_getivar_megamorphic,
num_setivar_megamorphic,
num_opt_case_dispatch_megamorphic,
num_throw,
num_throw_break,