* win32/file.c (IS_ABSOLUTE_PATH_P): home directory should not be
a relative path regardless a drive letter. PathIsRelativeW
returns FALSE on such path. [ruby-core:86356] [Bug #14638]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62952 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/README.win32: patch(1) is required, and running `make up` before
`make` is also required.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62840 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* Makefile.in, win32/Makefile.sub: move CANONICALIZATION_FOR_MATHN
from config.h which affects all extension libraries to XCFLAGS
for the core only.
* configure.ac: added --disable-mathn option.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62705 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/Makefile.sub (reconfig): phony target to force reconfigure
with previous options.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62659 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* configure.in (MJIT_LDSHARED): define based on LDSHARED with
replacing CC with MJIT_CC.
* Makefile.in, win32/Makefile.sub (mjit_config.h): instead of the
default LDSHARED, use MJIT_LDSHARED to link mjit shared objects.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62644 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/Makefile.sub: always link user32.lib which provides a lot
of very common library functions. [Bug #14422]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62629 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* configure.ac (MAINLIBS): moved library options for main program
and static libruby, and append MAINLIBS to LIBRUBYARG_STATIC, as
these libraries are not needed for linking to shared libruby.
[ruby-core:85882] [Bug #14422]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62627 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Passing options to configure like as `configure MJIT_OPTFLAGS=-O
MJIT_DEBUGFLAGS=-g` overrides options to be used to compile JIT
code, separately from the default options to be used for ruby
itself.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62623 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* Makefile.in, common.mk, win32/Makefile.sub: moved MJIT macros to
mjit_config.h from XCFLAGS.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62488 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* Makefile.in, win32/Makefile.sub (LIBRUBY_A): link with extension
libraries if EXTSTATIC is set, so that static-ruby would work
too.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62448 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* Makefie.in, win32/Makefile.sub: add more macros for compiler to
mjit_config.h.
* mjit.c: unification VC and GCC in progress.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62356 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/Makefile.sub (CPPOUTFLAG, MJIT_HEADER_FLAGS): -Fi option
is available since VC 10. redirect stdout on older versions.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62352 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* Makefie.in, win32/Makefile.sub: make mjit_config.h from
configured variables, including necessary options, e.g., `-m32`
for 32bit binary on 64bit platform.
* mjit.c: always use configured CC command. as config.h depends
on the compiler, different compilers cannot work.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62343 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/Makefile.sub (MESSAGE_BEGIN, MESSAGE_END): group the whole
`for` command, to redirect all lines but not overwrite line by
line.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62331 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/Makefile.sub (RUBY_VERSION_NAME): used in this file but not defined.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62324 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* configure.ac: MJIT_HEADER_INSTALL_DIR to rubyarchhdrdir to
support multiarch.
* Makefile.in (MJIT_HEADER_INSTALL_DIR): configured by multiarch.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62320 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/ifchange.bat: added --color option for the compatibility
with tool/ifchange. do nothing right now.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62299 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/Makefile.sub (LIBRUBYARG_SHARED): define for MJIT because it is used in
common.mk.
* mjit.c (make_pch): skip temporary for mswin.
* mjit.c (compile_c_to_so, init_header_filename, mjit_init): mswin support.
* mjig_compile.c (mjit_compile): ditto.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62267 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* Makefile.in, win32/Makefile.sub (XCFLAGS): moved MJIT_CPPFLAGS
from CPPFLAGS. MJIT_CPPFLAGS is only for mjit.c, unused in
extension libraries.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62261 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* common.mk (MJIT_CPPFLAGS): moved common definition flags for
mjit compilation.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62256 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* common.mk (MJIT_HEADER, MJIT_MIN_HEADER): added hook to separate
intermediate headers per archs.
* defs/gmake.mk: build mjit headers per -arch options, and then
merge the headers with `#ifdef`s.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62245 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
so that MJIT can work if Ruby is distributed as prebuilt binary.
Now mjit_init() depends on the internal const TMP_RUBY_PREFIX which is
only available after ruby_init_loadpath_safe() (L1608) and before
ruby_init_prelude() (L1681). So the place of mjit_init() is moved.
Makefile.in: Removed static prefix from MJIT_HEADER_ISNTALL_DIR macro.
And this removes the unused LIBRUBY_LIBDIR macro as well.
win32/Makefile.sub: ditto.
Patch by: Lars Kanis <lars@greiz-reinsdorf.de>
[Bug #14445]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62238 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/Makefile.sub: va_copy is available since VS12 (VC 18.00).
simple copy same as VC1 19.00.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62223 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* common.mk (rb_mjit_header.h): use $(CPPOUTFLAG).
* win32/Makefile.sub (CPPOUTFLAG): needs -Fi to let cl.exe name
preprocessed file, instead of -Fo.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62208 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* common.mk (rb_mjit_header.h): moved from Makefile.in and
win32/Makefile.sub.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62202 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/Makefile.sub: split CFLAGS into CFLAGS_NO_ARCH and
ARCH_FLAG, as well as Makefile.in.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62201 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
which has been developed by Takashi Kokubun <takashikkbn@gmail> as
YARV-MJIT. Many of its bugs are fixed by wanabe <s.wanabe@gmail.com>.
This JIT compiler is designed to be a safe migration path to introduce
JIT compiler to MRI. So this commit does not include any bytecode
changes or dynamic instruction modifications, which are done in original
MJIT.
This commit even strips off some aggressive optimizations from
YARV-MJIT, and thus it's slower than YARV-MJIT too. But it's still
fairly faster than Ruby 2.5 in some benchmarks (attached below).
Note that this JIT compiler passes `make test`, `make test-all`, `make
test-spec` without JIT, and even with JIT. Not only it's perfectly safe
with JIT disabled because it does not replace VM instructions unlike
MJIT, but also with JIT enabled it stably runs Ruby applications
including Rails applications.
I'm expecting this version as just "initial" JIT compiler. I have many
optimization ideas which are skipped for initial merging, and you may
easily replace this JIT compiler with a faster one by just replacing
mjit_compile.c. `mjit_compile` interface is designed for the purpose.
common.mk: update dependencies for mjit_compile.c.
internal.h: declare `rb_vm_insn_addr2insn` for MJIT.
vm.c: exclude some definitions if `-DMJIT_HEADER` is provided to
compiler. This avoids to include some functions which take a long time
to compile, e.g. vm_exec_core. Some of the purpose is achieved in
transform_mjit_header.rb (see `IGNORED_FUNCTIONS`) but others are
manually resolved for now. Load mjit_helper.h for MJIT header.
mjit_helper.h: New. This is a file used only by JIT-ed code. I'll
refactor `mjit_call_cfunc` later.
vm_eval.c: add some #ifdef switches to skip compiling some functions
like Init_vm_eval.
win32/mkexports.rb: export thread/ec functions, which are used by MJIT.
include/ruby/defines.h: add MJIT_FUNC_EXPORTED macro alis to clarify
that a function is exported only for MJIT.
array.c: export a function used by MJIT.
bignum.c: ditto.
class.c: ditto.
compile.c: ditto.
error.c: ditto.
gc.c: ditto.
hash.c: ditto.
iseq.c: ditto.
numeric.c: ditto.
object.c: ditto.
proc.c: ditto.
re.c: ditto.
st.c: ditto.
string.c: ditto.
thread.c: ditto.
variable.c: ditto.
vm_backtrace.c: ditto.
vm_insnhelper.c: ditto.
vm_method.c: ditto.
I would like to improve maintainability of function exports, but I
believe this way is acceptable as initial merging if we clarify the
new exports are for MJIT (so that we can use them as TODO list to fix)
and add unit tests to detect unresolved symbols.
I'll add unit tests of JIT compilations in succeeding commits.
Author: Takashi Kokubun <takashikkbn@gmail.com>
Contributor: wanabe <s.wanabe@gmail.com>
Part of [Feature #14235]
---
* Known issues
* Code generated by gcc is faster than clang. The benchmark may be worse
in macOS. Following benchmark result is provided by gcc w/ Linux.
* Performance is decreased when Google Chrome is running
* JIT can work on MinGW, but it doesn't improve performance at least
in short running benchmark.
* Currently it doesn't perform well with Rails. We'll try to fix this
before release.
---
* Benchmark reslts
Benchmarked with:
Intel 4.0GHz i7-4790K with 16GB memory under x86-64 Ubuntu 8 Cores
- 2.0.0-p0: Ruby 2.0.0-p0
- r62186: Ruby trunk (early 2.6.0), before MJIT changes
- JIT off: On this commit, but without `--jit` option
- JIT on: On this commit, and with `--jit` option
** Optcarrot fps
Benchmark: https://github.com/mame/optcarrot
| |2.0.0-p0 |r62186 |JIT off |JIT on |
|:--------|:--------|:--------|:--------|:--------|
|fps |37.32 |51.46 |51.31 |58.88 |
|vs 2.0.0 |1.00x |1.38x |1.37x |1.58x |
** MJIT benchmarks
Benchmark: https://github.com/benchmark-driver/mjit-benchmarks
(Original: https://github.com/vnmakarov/ruby/tree/rtl_mjit_branch/MJIT-benchmarks)
| |2.0.0-p0 |r62186 |JIT off |JIT on |
|:----------|:--------|:--------|:--------|:--------|
|aread |1.00 |1.09 |1.07 |2.19 |
|aref |1.00 |1.13 |1.11 |2.22 |
|aset |1.00 |1.50 |1.45 |2.64 |
|awrite |1.00 |1.17 |1.13 |2.20 |
|call |1.00 |1.29 |1.26 |2.02 |
|const2 |1.00 |1.10 |1.10 |2.19 |
|const |1.00 |1.11 |1.10 |2.19 |
|fannk |1.00 |1.04 |1.02 |1.00 |
|fib |1.00 |1.32 |1.31 |1.84 |
|ivread |1.00 |1.13 |1.12 |2.43 |
|ivwrite |1.00 |1.23 |1.21 |2.40 |
|mandelbrot |1.00 |1.13 |1.16 |1.28 |
|meteor |1.00 |2.97 |2.92 |3.17 |
|nbody |1.00 |1.17 |1.15 |1.49 |
|nest-ntimes|1.00 |1.22 |1.20 |1.39 |
|nest-while |1.00 |1.10 |1.10 |1.37 |
|norm |1.00 |1.18 |1.16 |1.24 |
|nsvb |1.00 |1.16 |1.16 |1.17 |
|red-black |1.00 |1.02 |0.99 |1.12 |
|sieve |1.00 |1.30 |1.28 |1.62 |
|trees |1.00 |1.14 |1.13 |1.19 |
|while |1.00 |1.12 |1.11 |2.41 |
** Discourse's script/bench.rb
Benchmark: https://github.com/discourse/discourse/blob/v1.8.7/script/bench.rb
NOTE: Rails performance was somehow a little degraded with JIT for now.
We should fix this.
(At least I know opt_aref is performing badly in JIT and I have an idea
to fix it. Please wait for the fix.)
*** JIT off
Your Results: (note for timings- percentile is first, duration is second in millisecs)
categories_admin:
50: 17
75: 18
90: 22
99: 29
home_admin:
50: 21
75: 21
90: 27
99: 40
topic_admin:
50: 17
75: 18
90: 22
99: 32
categories:
50: 35
75: 41
90: 43
99: 77
home:
50: 39
75: 46
90: 49
99: 95
topic:
50: 46
75: 52
90: 56
99: 101
*** JIT on
Your Results: (note for timings- percentile is first, duration is second in millisecs)
categories_admin:
50: 19
75: 21
90: 25
99: 33
home_admin:
50: 24
75: 26
90: 30
99: 35
topic_admin:
50: 19
75: 20
90: 25
99: 30
categories:
50: 40
75: 44
90: 48
99: 76
home:
50: 42
75: 48
90: 51
99: 89
topic:
50: 49
75: 55
90: 58
99: 99
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62197 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* common.mk ($(MJIT_MIN_HEADER)): moved duplicate recipe from
Makefile.in and win32/Makefile.sub.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62195 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* Makefile.in, win32/Makefile.sub (rb_mjit_header.h): use ifchange
tool. cmp command is not available on Windows.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62194 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
that allows to JIT-compile Ruby methods by generating C code and
using C compiler. See the first comment of mjit.c to know what this
file does.
mjit.c is authored by Vladimir Makarov <vmakarov@redhat.com>.
After he invented great method JIT infrastructure for MRI as MJIT,
Lars Kanis <lars@greiz-reinsdorf.de> sent the patch to support MinGW
in MJIT. In addition to merging it, I ported pthread to Windows native
threads. Now this MJIT infrastructure can be compiled on Visual Studio.
This commit simplifies mjit.c to decrease code at initial merge. For
example, this commit does not provide multiple JIT threads support.
We can resurrect them later if we really want them, but I wanted to minimize
diff to make it easier to review this patch.
`/tmp/_mjitXXX` file is renamed to `/tmp/_ruby_mjitXXX` because non-Ruby
developers may not know the name "mjit" and the file name should make
sure it's from Ruby and not from some harmful programs. TODO: it may be
better to store this to some temporary directory which Ruby is already using
by Tempfile, if it's not bad for performance.
mjit.h: New. It has `mjit_exec` interface similar to `vm_exec`, which is
for triggering MJIT. This drops interface for AOT compared to the original
MJIT.
Makefile.in: define macros to let MJIT know the path of MJIT header.
Probably we can refactor this to reduce the number of macros (TODO).
win32/Makefile.sub: ditto.
common.mk: compile mjit.o and mjit_compile.o. Unlike original MJIT, this
commit separates MJIT infrastructure and JIT compiler code as independent
object files. As initial patch is NOT going to have ultra-fast JIT compiler,
it's likely to replace JIT compiler, e.g. original MJIT's compiler or some
future JIT impelementations which are not public now.
inits.c: define MJIT module. This is added because `MJIT.enabled?` was
necessary for testing.
test/lib/zombie_hunter.rb: skip if `MJIT.enabled?`. Obviously this
wouldn't work with current code when JIT is enabled.
test/ruby/test_io.rb: skip this too. This would make no sense with MJIT.
ruby.c: define MJIT CLI options. As major difference from original MJIT,
"-j:l"/"--jit:llvm" are renamed to "--jit-cc" because I want to support
not only gcc/clang but also cl.exe (Visual Studio) in the future. But it
takes only "--jit-cc=gcc", "--jit-cc=clang" for now. And only long "--jit"
options are allowed since some Ruby committers preferred it at Ruby
developers Meeting on January, and some of options are renamed.
This file also triggers to initialize MJIT thread and variables.
eval.c: finalize MJIT worker thread and variables.
test/ruby/test_rubyoptions.rb: fix number of CLI options for --jit.
thread_pthread.c: change for pthread abstraction in MJIT. Prefix rb_ for
functions which are used by other files.
thread_win32.c: ditto, for Windows. Those pthread porting is one of major
works that YARV-MJIT created, which is my fork of MJIT, in Feature 14235.
thread.c: follow rb_ prefix changes
vm.c: trigger MJIT call on VM invocation. Also trigger `mjit_mark` to avoid
SEGV by race between JIT and GC of ISeq. The improvement was provided by
wanabe <s.wanabe@gmail.com>.
In JIT compiler I created and am going to add in my next commit, I found
that having `mjit_exec` after `vm_loop_start:` is harmful because the
JIT-ed function doesn't proceed other ISeqs on RESTORE_REGS of leave insn.
Executing non-FINISH frame is unexpected for my JIT compiler and
`exception_handler` triggers executions of such ISeqs. So `mjit_exec`
here should be executed only when it directly comes from `vm_exec` call.
`RubyVM::MJIT` module and `.enabled?` method is added so that we can skip
some tests which don't expect JIT threads or compiler file descriptors.
vm_insnhelper.h: trigger MJIT on method calls during VM execution.
vm_core.h: add fields required for mjit.c. `bp` must be `cfp[6]` because
rb_control_frame_struct is likely to be casted to another struct. The
last position is the safest place to add the new field.
vm_insnhelper.c: save initial value of cfp->ep as cfp->bp. This is an
optimization which are done in both MJIT and YARV-MJIT. So this change
is added in this commit. Calculating bp from ep is a little heavy work,
so bp is kind of cache for it.
iseq.c: notify ISeq GC to MJIT. We should know which iseq in MJIT queue
is GCed to avoid SEGV. TODO: unload some GCed units in some safe way.
gc.c: add hooks so that MJIT can wait GC, and vice versa. Simultaneous
JIT and GC executions may cause SEGV and so we should synchronize them.
cont.c: save continuation information in MJIT worker. As MJIT shouldn't
unload JIT-ed code which is being used, MJIT wants to know full list of
saved execution contexts for continuation and detect ISeqs in use.
mjit_compile.c: added empty JIT compiler so that you can reuse this commit
to build your own JIT compiler. This commit tries to compile ISeqs but
all of them are considered as not supported in this commit. So you can't
use JIT compiler in this commit yet while we added --jit option now.
Patch author: Vladimir Makarov <vmakarov@redhat.com>.
Contributors:
Takashi Kokubun <takashikkbn@gmail.com>.
wanabe <s.wanabe@gmail.com>.
Lars Kanis <lars@greiz-reinsdorf.de>.
Part of Feature 12589 and 14235.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62189 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
compilation which is created by transforming a preprocessed vm.c.
This file will be used by JIT compiler's generated code which we are
going to have from succeeding commits.
Makefile.in: generate MJIT header for UNIX environments.
win32/Makefile.sub: generate MJIT header for mswin environments.
At initial merge, we're going to support only MinGW for Windows. So the
header installed by this file won't be used for short term, but we'll
add mswin support in a half year or so, for sure.
tool/transform_mjit_header.rb: New. This script was originally written as
minimize_mjit_header.rb by Vladimir N. Makarov <vmakarov@redhat.com> for
Feature 12589.
Then I refactored a little so that it can conform CodeClimate CI which is
currently set for Ruby's GitHub repository, and fixed some bugs and ported
it to work on Windows.
Also, as original minimize_mjit_header.rb takes too long time to run,
this is modified to skip minimization step because having *static*
unused definitions does not waste compilation time on -O2 since compiler
can skip to compile unused static functions. So this does no longer
"minimize" the header and is renamed.
This header installation does NOT include a header to automatically
export symbols used by MJIT. That's because original MJIT code was
failing to export symbols in the import header in macOS environment.
But I would like to have the functionality for maintainability in the
future. I'll manually export things but it would be just an intemediate
solution.
Patch by: Vladimir N. Makarov <vmakarov@redhat.com>
Part of: Feature 12589 and 14235.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62187 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/win32.c (rb_w32_write): writing to closed pipe fails with
ERROR_NO_DATA but msvcrt maps it to EINVAL. map it to EPIPE.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62150 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/setup.mak: discard output from BASERUBY command, even if
it contains multiple commands.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62110 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Other places are using RT_VER. So I guess this is correct.
Currently AppVeyor CI is failing and I want to fix that.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62063 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* include/ruby/missing.h (nan): need to declare the prototype of nan() if
missing.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62061 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* win32/Makefile.sub (MISSING): nan() is available since msvcrr120.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61980 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
C11 and C++11 has this feature so why not use it when available.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61828 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
For instance array.c:rb_ary_product() uses RSTRING_PTR() as an
array of int. So to avoid misaligned memory access RSTRING_PTR()
must at least be sizeof(int)-aligned. However the type of
RSTRING_PTR() is char*, which of course can expect alignment as
much as 1. This is a problem.
The reality is, there is no misaligned memory access because the
memory region behind RSTRING_PTR() is allocated using malloc().
Memory regions returned from malloc() are always aligned
appropriately. So let's tell the compiler about this information.
It seems GCC, clang, and MSVC have such feature.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61827 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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