[Bug 107212] Dual-Core CPU E5500 / G45: RetroArch with reicast core results in corrupted graphics

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107212

--- Comment #31 from Diego Viola <diego.viola at gmail.com> ---
[diego at dualcore mesa]$ git bisect good
797d606127c131a6ccff28150495d2b1f3f7e46e is the first bad commit
commit 797d606127c131a6ccff28150495d2b1f3f7e46e
Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Fri Feb 20 15:11:49 2015 -0800

    i965: Implement SIMD16 texturing on Gen4.

    This allows SIMD16 mode to work for a lot more programs.  Texturing is
    also more efficient in SIMD16 mode than SIMD8.  Several messages don't
    actually exist in SIMD8 mode, so we did SIMD16 messages and threw away
    half of the data.  Now we compute real data in both halves.

    Also, the SIMD16 "sample" message doesn't require all three coordinate
    components to exist (like the SIMD8 one), so we can shorten the message
    lengths, cutting register usage a bit.

    I chose to implement the visitor functionality in a separate function,
    since mixing true SIMD16 with SIMD8 code that uses SIMD16 fallbacks
    seemed like a mess.  The new code bails on a few cases where we'd
    have to do two SIMD8 messages - we just fall back to SIMD8 for now.

    Improves performance in "Shadowrun: Dragonfall - Director's Cut" by
    about 20% on GM45 (measured with LIBGL_SHOW_FPS=1 while standing around
    in the first mission).

    v2: Add ir_txf to the has_lod case (caught by Jordan Justen).

    Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
    Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>

:040000 040000 45a6b6fb2fd15aab6b877277ecee33b41cad2ef4
325dfafa624c61855d7dc9e7ed94e540e991b28e M      src
[diego at dualcore mesa]$

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