[Webkit-unassigned] [Bug 189151] New: V8 faster than JSC at String.prototype.toString()

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Aug 30 03:37:21 PDT 2018


https://bugs.webkit.org/show_bug.cgi?id=189151

            Bug ID: 189151
           Summary: V8 faster than JSC at String.prototype.toString()
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nickshanks at nickshanks.com

Created attachment 348495

  --> https://bugs.webkit.org/attachment.cgi?id=348495&action=review

Screenshot of my results including Firefox

I ran some performance tests at https://jsperf.com/string-object-conversion-to-primitive and found that Chrome is 25% faster than Safari at converting a 32kB String object to a string primitive. Perhaps there is some win that can be achieved by copying whatever they're doing?

My numbers, Safari 11.1.2 (Mac OS 10.11.6):
Object.valueOf()        144,794,835 ± 0.7%
Object.toString()       142,425,187 ± 1.0%

Chrome 68.0.3440:
Object.valueOf()        177,410,422 ± 1.33%
Object.toString()       178,729,042 ± 1.12%


p.s. Safari blows Chrome out of the water with the `+` operator, at almost 100x faster!

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