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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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| .. | ||
| _attributes.erb | ||
| _c_expr.erb | ||
| _comptime_insn_stack_increase.erb | ||
| _copyright.erb | ||
| _insn_entry.erb | ||
| _insn_len_info.erb | ||
| _insn_name_info.erb | ||
| _insn_operand_info.erb | ||
| _insn_sp_pc_dependency.erb | ||
| _insn_type_chars.erb | ||
| _leaf_helpers.erb | ||
| _mjit_compile_insn.erb | ||
| _mjit_compile_insn_body.erb | ||
| _mjit_compile_ivar.erb | ||
| _mjit_compile_pc_and_sp.erb | ||
| _mjit_compile_send.erb | ||
| _notice.erb | ||
| _sp_inc_helpers.erb | ||
| _trace_instruction.erb | ||
| insns.inc.erb | ||
| insns_info.inc.erb | ||
| mjit_compile.inc.erb | ||
| opt_sc.inc.erb | ||
| optinsn.inc.erb | ||
| optunifs.inc.erb | ||
| vm.inc.erb | ||
| vmtc.inc.erb | ||