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]

1 files changed, 1 insertions, 1 deletions

diff --git a/tool/ruby_vm/views/insns_info.inc.erb b/tool/ruby_vm/views/insns_info.inc.erb
index e5793a2a70..2ca5aca7cf 100644
--- a/tool/ruby_vm/views/insns_info.inc.erb
+++ b/tool/ruby_vm/views/insns_info.inc.erb
@@ -18,5 +18,5 @@
 <%= render 'leaf_helpers' %>
 <%= render 'sp_inc_helpers' %>
 <%= render 'attributes' %>
-<%= render 'insn_stack_increase' %>
+<%= render 'comptime_insn_stack_increase' %>
 <%= render 'insn_sp_pc_dependency' %>