[Bug 111071] SPIR-V shader processing fails with message about "extra dangling SSA sources"

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Jul 10 22:25:21 UTC 2019


https://bugs.freedesktop.org/show_bug.cgi?id=111071

--- Comment #4 from Jason Ekstrand <jason at jlekstrand.net> ---
Also, are you sure that test is correct?  It's doing

> void main()
> {
>  _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
>  for(
>      int i = 0;
>      i < 10;
>      i ++
>  )
>   {
>    _GLF_color = vec4(1.0);
>    if(1.0 > injectionSwitch.y)
>     {
>      _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
>      if(true)
>       {
>        return;
>       }
>     }
>   }
> }

but the input data it sets up has injectionSwitch.y == 1.0 so the if will fail
because 1.0 > 1.0 is false and so _GLF_color will get overwritten to vec4(1.0)
and never written back to red.  Our compiler seems to be compiling it
correctly.

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