[Webkit-unassigned] [Bug 141498] New: [Win] [64-bit] Work around MSVC2013 Runtime Bug

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Feb 11 20:26:58 PST 2015


            Bug ID: 141498
           Summary: [Win] [64-bit] Work around MSVC2013 Runtime Bug
    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

Microsoft Visual Studio 2013 has a bug in their 64-bit runtime libraries that causes a crash with error "0xC000001D: Illegal Instruction" if the CPU does not support the AVX2 instruction set. Apparently, the runtime library does not properly recognize when the AVX2 set is not present (or if it has been disabled in the firmware) and attempts to use them regardless of CPU support. Microsoft apparently does not plan to address this in any VS2013 update. The VS2015 environment does have a correction for this.

Until Microsoft releases VS2015 (and this project migrates to it), our only recourse is to disable the use of FMA3 in the math library.

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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