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89e7997622
To perform a regular method call, the VM needs two structs, `rb_call_info` and `rb_call_cache`. At the moment, we allocate these two structures in separate buffers. In the worst case, the CPU needs to read 4 cache lines to complete a method call. Putting the two structures together reduces the maximum number of cache line reads to 2. Combining the structures also saves 8 bytes per call site as the current layout uses separate two pointers for the call info and the call cache. This saves about 2 MiB on Discourse. This change improves the Optcarrot benchmark at least 3%. For more details, see attached bugs.ruby-lang.org ticket. Complications: - A new instruction attribute `comptime_sp_inc` is introduced to calculate SP increase at compile time without using call caches. At compile time, a `TS_CALLDATA` operand points to a call info struct, but at runtime, the same operand points to a call data struct. Instruction that explicitly define `sp_inc` also need to define `comptime_sp_inc`. - MJIT code for copying call cache becomes slightly more complicated. - This changes the bytecode format, which might break existing tools. [Misc #16258] |
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| lib | ||
| m4 | ||
| ruby_vm | ||
| test | ||
| asm_parse.rb | ||
| bisect.sh | ||
| build-transcode | ||
| checksum.rb | ||
| colors | ||
| darwin-cc | ||
| downloader.rb | ||
| enc-emoji-citrus-gen.rb | ||
| enc-emoji4unicode.rb | ||
| enc-unicode.rb | ||
| eval.rb | ||
| expand-config.rb | ||
| extlibs.rb | ||
| fake.rb | ||
| fetch-bundled_gems.rb | ||
| file2lastrev.rb | ||
| format-release | ||
| gem-unpack.rb | ||
| gen_dummy_probes.rb | ||
| gen_ruby_tapset.rb | ||
| generic_erb.rb | ||
| git-refresh | ||
| gperf.sed | ||
| id2token.rb | ||
| ifchange | ||
| insns2vm.rb | ||
| install-sh | ||
| leaked-globals | ||
| make-snapshot | ||
| make_hgraph.rb | ||
| mdoc2man.rb | ||
| merger.rb | ||
| mjit_archflag.sh | ||
| mk_call_iseq_optimized.rb | ||
| mkconfig.rb | ||
| mkrunnable.rb | ||
| node_name.rb | ||
| parse.rb | ||
| prereq.status | ||
| probes_to_wiki.rb | ||
| pure_parser.rb | ||
| rbinstall.rb | ||
| rbuninstall.rb | ||
| redmine-backporter.rb | ||
| release.sh | ||
| rmdirs | ||
| run-gcov.rb | ||
| run-lcov.rb | ||
| runruby.rb | ||
| strip-rdoc.rb | ||
| sync_default_gems.rb | ||
| test-bundled-gems.rb | ||
| test-coverage.rb | ||
| transcode-tblgen.rb | ||
| transform_mjit_header.rb | ||
| travis_retry.sh | ||
| update-deps | ||
| vtlh.rb | ||
| ytab.sed | ||