[Bug 83127] [ILK Bisected]Piglit glean_texCombine fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83127

Kenneth Graunke <kenneth at whitecape.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #12 from Kenneth Graunke <kenneth at whitecape.org> ---
commit 78bd12619474e98503965541c61c5d7e9c408110
Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Fri Sep 12 17:45:30 2014 -0700

    i965: Mark delta_x/y as BAD_FILE if remapped away completely.

    Commit afe3d1556f6b77031f7025309511a0eea2a3e8df (i965: Stop doing
    remapping of "special" regs.) stopped remapping delta_x/delta_y, and
    additionally stopped considering them always-live.  We later realized
    delta_x was used in register allocaiton, so we actually needed to remap
    it, which was fixed in commit 23d782067ae834ad53522b46638ea21c62e94ca3
    (i965/fs: Keep track of the register that hold delta_x/delta_y.).

    However, that commit didn't restore the "always consider it live" part.
    If all the code using delta_x was eliminated, fs_visitor::delta_x would
    be left pointing at its old register number.  Later code in register
    allocation would handle that register number specially...even though it
    wasn't actually delta_x.

    To combat this, set delta_x/y to BAD_FILE if they're eliminated, and
    check for that.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=83127
    Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
    Reviewed-by: Matt Turner <mattst88 at gmail.com>
    Cc: "10.3" <mesa-stable at lists.freedesktop.org>

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