[Webkit-unassigned] [Bug 203550] New: [JSC] DateMath should have TimeClipped version

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203550

            Bug ID: 203550
           Summary: [JSC] DateMath should have TimeClipped version
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ysuzuki at apple.com

ECMAScript uses milliseconds (double) as its internal representation, but Date constructor and its operation clips this double before actually using it.
As a result, this milliseconds is always within 53bit, and it is always integer. This means that we should use int64_t when calculating GregorianDateTime.
When running instruments profiler, 31% of time is consumed by `fmod`. This is really fun, we should use integers instead.

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