Comment #6 on issue 1662 by [email protected]: Excessive overhead of
String.replace(/a/g,'b')
http://code.google.com/p/v8/issues/detail?id=1662
$ ./d8 --prof test-d8.js
started: String.replace performance test
1mln char array composed in 35ms
array joined in 4ms
1mln symbol string: all symbols replaced in 87ms
too smart optimizations excluded 1000000 1000000 1000000
$ svn up
At revision 9145.
[C++]:
ticks total nonlib name
25 16.3% 16.3%
v8::internal::RegExpImpl::AtomExec(v8::internal::Handle<v8::internal::JSRegExp>,
v8::internal::Handle<v8::internal::String>, int,
v8::internal::Handle<v8::internal::JSArray>)
10 6.5% 6.5%
v8::internal::CompiledReplacement::Apply(v8::internal::ReplacementStringBuilder*,
int, int, v8::internal::Handle<v8::internal::JSArray>)
10 6.5% 6.5% memcpy
Attachments:
v8.log.gz 13.1 KB
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