[Webkit-unassigned] [Bug 173663] New: B3BreakCriticalEdges.cpp with /O2 causes ICE in VS2015, 2017

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173663

            Bug ID: 173663
           Summary: B3BreakCriticalEdges.cpp with /O2 causes ICE in
                    VS2015, 2017
           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: vladimir at pobox.com

With Visual Studio 2015, 2017 (vc 14.0/14.1) building B3BreakCriticalEdges.cpp with the default /O2 (or /Ox) causes an internal compiler error:

c:\proj\js\webkit\source\javascriptcore\b3\b3breakcriticaledges.cpp(62) : fatal error C1001: An internal error has occurred in the compiler.
(compiler file 'f:\dd\vctools\compiler\utc\src\p2\main.c', line 255)
 To work around this problem, try simplifying or changing the program near the locations listed above.
Please choose the Technical Support command on the Visual C++
 Help menu, or open the Technical Support help file for more information

INTERNAL COMPILER ERROR in 'C:\PROGRA~2\MICROS~1\2017\PROFES~1\VC\Tools\MSVC\1410~1.250\bin\HostX86\x64\cl.exe'
    Please choose the Technical Support command on the Visual C++
    Help menu, or open the Technical Support help file for more information

"/Os" builds fine.

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