commit 83343ba1d1b70f6a41adacef9067721b40e4c035
author akling@apple.com <akling@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> Mon May 05 18:08:25 2014 +0000
committer akling@apple.com <akling@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> Mon May 05 18:08:25 2014 +0000
tree dec2dd4624bb28963ded5dde99ffef086887e027
parent 278c16b1df944a24fddc9bbd6906c9aee0527d6d

Optimize PutByVal when subscript is a rope string.
<https://webkit.org/b/132572>

Add a JSString::toIdentifier() that is smarter when the JSString is
really a rope string. Use this in baseline & DFG's PutByVal to avoid
allocating new StringImpls that we immediately deduplicate anyway.

Reviewed by Antti Koivisto.

* dfg/DFGOperations.cpp:
(JSC::DFG::operationPutByValInternal):
* jit/JITOperations.cpp:
* runtime/JSString.h:
(JSC::JSString::toIdentifier):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@168300 268f45cc-cd09-0410-ab3c-d52691b4dbfc