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* ChangeLog: fix typos of r37293.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37300 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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nagachika 2012-10-23 15:54:20 +00:00
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@ -25,20 +25,20 @@ Tue Oct 23 14:06:47 2012 Nobuyoshi Nakada <nobu@ruby-lang.org>
Tue Oct 23 12:57:29 2012 Koichi Sasada <ko1@atdot.net>
* vm_core.h, vm_insnhelper.c, vm_eval.c (OPT_CALL_CFUNC_WITHOUT_FRAME):
add a new otpimization and its macro `OPT_CALL_CFUNC_WITHOUT_FRAME'.
add a new optimization and its macro `OPT_CALL_CFUNC_WITHOUT_FRAME'.
This optimization makes all cfunc method calls `frameless', which
is fster than ordinal cfunc method call.
is faster than ordinal cfunc method call.
If `frame' is needed (for example, it calls another method with
`rb_funcall()'), then build a frame. In other words, this
optimization delays frame building.
However, to delay the frame building, we need additional overheads:
(1) Store the last call information.
(2) Check the delayed frame buidling before the frame is needed.
(2) Check the delayed frame building before the frame is needed.
(3) Overhead to build a delayed frame.
rb_thread_t::passed_ci is storage of delayed cfunc call information.
(1) is lightweight because it is only 1 assignment to `passed_ci'.
To achieve (2), we modify GET_THREAD() to check `passed_ci' every
time. It causes 10% overhead on my envrionment.
time. It causes 10% overhead on my environment.
This optimization only works for cfunc methods which do not need
their `frame'.
After evaluation on my environment, this optimization does not