[Mesa3d-dev] [Bug 27216] New: Assignment with a function call in an if statement causes an assertion failure

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=27216

           Summary: Assignment with a function call in an if statement
                    causes an assertion failure
           Product: Mesa
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
        AssignedTo: mes...@li...
        ReportedBy: ne...@li...


This GLSL fragment shader causes an assertion failure from Mesa:

 void
 main ()
 {
   float thing;

   if ((thing = sqrt (5.0)) > 1.0)
     gl_FragColor = vec4 (1.0, 0.0, 0.0, 1.0);
 }

The assertion is "assert(index >= 0);" in storage_to_src_reg in slang_emit.c

Taking away the assignment or the function call avoids the problem. As does
moving the expression to outside the if condition.


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