Bug 38714 - Add result caching for Math.sin
Reviewed by Geoff Garen.
Math.sin is frequently called with the same operand, caching the result should
improve performance. CachedTranscendentalFunction adds a generic mechanism to
cache results for pure functions with the signature "double func(double)", and
where NaN maps to NaN.
CachedTranscendentalFunction uses a very simple hash function designed to be
fast to execute since we cannot cache the result, and trivial to JIT generate,
should we wish to do so.
* JavaScriptCore.xcodeproj/project.pbxproj:
* runtime/CachedTranscendentalFunction.h: Added.
(JSC::CachedTranscendentalFunction::CachedTranscendentalFunction):
(JSC::CachedTranscendentalFunction::~CachedTranscendentalFunction):
(JSC::CachedTranscendentalFunction::operator()):
(JSC::CachedTranscendentalFunction::initialize):
(JSC::CachedTranscendentalFunction::hash):
* runtime/JSGlobalData.h:
* runtime/MathObject.cpp:
(JSC::mathProtoFuncSin):
* wtf/Platform.h:
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@58935 268f45cc-cd09-0410-ab3c-d52691b4dbfc
6 files changed
