2008-10-17 Maciej Stachowiak <mjs@apple.com>

2008-10-17  Maciej Stachowiak  <mjs@apple.com>

        Reviewed by Cameron Zwarich.

        - Avoid restoring the caller's 'r' value in op_ret
        https://bugs.webkit.org/show_bug.cgi?id=21319

        This patch stops writing the call frame at call and return points;
        instead it does so immediately before any CTI call.

        0.5% speedup or so on the v8 benchmark

        * VM/CTI.cpp:
        (JSC::CTI::emitCTICall):
        (JSC::CTI::compileOpCall):
        (JSC::CTI::emitSlowScriptCheck):
        (JSC::CTI::compileBinaryArithOpSlowCase):
        (JSC::CTI::privateCompileMainPass):
        (JSC::CTI::privateCompileSlowCases):
        (JSC::CTI::privateCompile):
        * VM/CTI.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@37650 268f45cc-cd09-0410-ab3c-d52691b4dbfc