https://bugs.freedesktop.org/show_bug.cgi?id=103142

            Bug ID: 103142
           Summary: R600g+sb: optimizer apparently stuck in an endless
                    loop
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: gw.fossdev@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 134738
  --> https://bugs.freedesktop.org/attachment.cgi?id=134738&action=edit
TGSI, byte code and logging output

With sb enabled some shaders apparently trigger an endless loops in the sb
optimizer. 

The attached TGSI and log of a shader triggering this behaviour comes from the
Unreal Editor version 4.17.1,  

The log was created with 

  #define PSC_DEBUG 1 

in src/gallium/drivers/r600/sb_sched.cpp

The problem is probably related to the "FIXME rework this loop" on line 1808 in
the same file, and I also have the impression that it has something to do with
MULADD when the sources are a mix of CONST and IMM.

I'd try to fix it myself, but right now I don't really have a clue how to
approach this bug.

best, 
Gert

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