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]
This changeset modifies the VM generator so that vm.inc is written in
C99. Also added some comments in _insn_entry.erb so that the
intention of each parts to be made more clear. I think this improves
overall readability of the generated VM.
Confirmed that the exact same binary is generated before/after this
changeset.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66923 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
The idea behind this commit is that handles_sp and leaf are two
concepts that are not mutually independent. By making one explicitly
depend another, we can reduces the number of lines of codes written,
thus making things concise.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65426 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This enhances stability of the generated source code (namely
insns_info.inc) across attribute insertion / deletion. It does
not change the compiled binary at all; just a bit of readability.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65425 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This is mostly cosmetic. Should generate a slightly readable
vm.inc output.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64709 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
to raise descriptive KeyError instead of NoMethodError in case these
attrs are accidentally removed.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64685 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
when catch_except_p is false and insn.always_leaf? is true (never makes
arbitrary method call in the insn).
On Optcarrot, unfortunately this didn't have measureable performance impact.
But still this is a good direction since it becomes much faster when
marking all insns as always leaf.
bare_instructions.rb: add `#always_leaf?` that indicates the insn can
always be considered as leaf. Using dynamic leaf for JIT would be hard
since it requires to discard outdated code somehow.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64683 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
An instruction is leaf if it has no rb_funcall inside. In order to
check this property, we introduce stack canary which is a random
number collected at runtime. Stack top is always filled with this
number and checked for stack smashing operations, when VM_CHECK_MODE.
[GH-1947]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64677 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
because it's more suitable to describe the current behavior now.
tool/ruby_vm/models/bare_instructions.rb: ditto.
tool/ruby_vm/views/_insn_entry.erb: ditto.
tool/ruby_vm/views/_mjit_compile_insn_body.erb: ditto.
tool/ruby_vm/views/_mjit_compile_pc_and_sp.erb: ditto.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64053 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This optimization was reverted on r63863, but this commit resurrects the
optimization to skip some sp motions on JIT execution.
tool/ruby_vm/views/_mjit_compile_insn_body.erb: ditto
tool/ruby_vm/views/_mjit_compile_insn.erb: ditto
insns.def: resurrect handles_frame as handles_stack, which was deleted
on r63763.
tool/ruby_vm/models/bare_instructions.rb: ditto
vm_insnhelper.c: prevent moving sp outside insns.def to allow modifying
it by JIT.
* Optcarrot benchmark
$ benchmark-driver benchmark.yml --rbenv 'before --jit;after --jit' --repeat-count 12 -v
before --jit: ruby 2.6.0dev (2018-07-17 trunk 63987) +JIT [x86_64-linux]
after --jit: ruby 2.6.0dev (2018-07-17 local-stack 63987) +JIT [x86_64-linux]
last_commit=mjit_compile.c: resurrect local variable stack
Calculating -------------------------------------
before --jit after --jit
Optcarrot Lan_Master.nes 70.518 72.144 fps
Comparison:
Optcarrot Lan_Master.nes
after --jit: 72.1 fps
before --jit: 70.5 fps - 1.02x slower
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63988 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
I introduced this mechanism in r62051 to speed things up. Later it
was reported that the change causes problems. I searched for
workarounds but nothing seemed appropriate. I hereby officially
give it up. The idea to move ADD_PC around was a mistake.
Fixes [Bug #14809] and [Bug #14834].
Signed-off-by: Urabe, Shyouhei <shyouhei@ruby-lang.org>
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63763 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* tool/ruby_vm/models/bare_instructions.rb (predefine_attributes):
`sp_inc` attribute which may return negative values must be
signed `rb_snum_t`, to be signed-expanded at type promotion.
* vm_insnhelper.h (ADJ_SP): removed the workaround for platforms
where rb_num_t is wider than int.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62103 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Instead of using magic numbers, let us define a series of attributes
and use them from the VM core. Proper function declarations makes
these attributes inlined in most modern compilers. On my machine
exact same binary is generated with or without this changeset.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62085 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
as it's helpful for debugging.
I'm not sure what's the good output for RubyVM::TraceInstructions, so I
left it as it is.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62068 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This was not requested :) but actually easier than the previous
so I just did it anyway.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61787 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Previous commit changed insns.def format. Now is the time for its
generators. In doing so I chose to modernize the system, not just
patch. My attempt includes
- extensive use of Onigumo regular expressions
- split from one big file (instruction.rb) into separated MVC
- partial view
Also, let me take this opportunity to kill old unused features
such as
- stack caching
- minsns / yasmdata which are never seriously used
- yarvarch document generation (moved to doc/)
- vast majority of unused arguments to insns2vm.rb
This commit generates VM source codes that cleanly compile, and
the generated binary passes tests. At least for me.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61784 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Previous commit changed insns.def format. Now is the time for its
generators. In doing so I chose to modernize the system, not just
patch. My attempt includes
- extensive use of Onigumo regular expressions
- split from one big file (instruction.rb) into separated MVC
- partial view
Also, let me take this opportunity to kill old unused features
such as
- stack caching
- minsns / yasmdata which are never seriously used
- yarvarch document generation (moved to doc/)
- vast majority of unused arguments to insns2vm.rb
This commit generates VM source codes that cleanly compile, and
the generated binary passes tests. At least for me.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61733 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
