[Mesa-dev] [Bug 83785] New: Shader branches excluded by uniform values are not optimized out

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83785

          Priority: medium
            Bug ID: 83785
          Assignee: mesa-dev at lists.freedesktop.org
           Summary: Shader branches excluded by uniform values are not
                    optimized out
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: rconde01 at hotmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 10.2
         Component: Mesa core
           Product: Mesa

In investigating bug 83570 I noticed that for shader code such as

uniform bool  u_debug;

if(!u_debug)
{
   //do some stuff
}
else
{
   //do some other stuff
}

both the if and else are executing. Seems like a pretty trivial
optimization...is there a reason it doesn't optimize out the excluded branch,
or is it just "yet to be done"?

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