Alan Wu 89e7997622 Combine call info and cache to speed up method invocation ... 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]		2019-10-24 18:03:42 +09:00
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controllers
helpers	vm.inc now in C99	2019-01-25 14:09:10 +00:00
loaders	Avoid defining unused instructions	2019-09-03 14:22:44 +09:00
models	Combine call info and cache to speed up method invocation	2019-10-24 18:03:42 +09:00
scripts
tests
views	Combine call info and cache to speed up method invocation	2019-10-24 18:03:42 +09:00