[Webkit-unassigned] [Bug 141499] New: [Win] [64-bit] Remove MSVC 2013 Workaround

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=141499

            Bug ID: 141499
           Summary: [Win] [64-bit] Remove MSVC 2013 Workaround
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

At Microsoft's suggestion, we have disabled FMA3 support for 64-bit builds due to a bug in the MSVC 2013 runtime libraries. When we switch to Visual Studio 2015 (or newer), where this bug is fixed, we should remove this workaround so that we can enjoy the improved vector instruction support.

See <https://connect.microsoft.com/VisualStudio/feedback/details/811093/visual-studio-2013-rtm-c-x64-code-generation-bug-for-avx2-instructions> for some comments from Microsoft on this topic.

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