[Bug 36753] New: Some textures now rendered as completely black after register allocator rewrite.

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=36753

           Summary: Some textures now rendered as completely black after
                    register allocator rewrite.
           Product: Mesa
           Version: git
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: rankincj@googlemail.com


Running World of Warcraft on my M66GL (RV530), and some textures are now
rendered as completely black. However, my RV350 is unaffected.

git bisect says:

fe622bac0c1b5b9f2a9fcf9f35b51232a06bea42 is the first bad commit
commit fe622bac0c1b5b9f2a9fcf9f35b51232a06bea42
Author: Tom Stellard <tstellar@gmail.com>
Date:   Tue Jan 11 00:05:08 2011 -0800

    r300/compiler: Rewrite register allocator

    The new allocator uses ra and does swizzle packing.

    Also, a data structure (struct rc_variable) and associated functions have
    been added for generating UD and DU chains.

:040000 040000 545a13a6577705511d30b471d6901237e793679c
f27924a4a5a40bab284ea7c03facab6c69875fb9 M    src

The following error messages are written to the output log:

r300 FP: Compiler Error:
Rewrite of inst 10 failed Can't allocate source for Inst 13 src_type=1
new_index=2 new_mask=1
Using a dummy shader instead.
r300 FP: Compiler Error:
Rewrite of inst 14 failed Can't allocate source for Inst 17 src_type=1
new_index=2 new_mask=1
Using a dummy shader instead.

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