[Bug 89057] [IVB 10.4]Piglit spec_ARB_gpu_shader5_arb_gpu_shader5-interpolateAtOffset-nonconst fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89057

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #2 from lu hua <huax.lu at intel.com> ---
(In reply to Ian Romanick from comment #1)
> Did the test change?  Are you able to bisect from 10.4 to master to see
> where it was "fixed"?

I reset the same test environment, I am unable to reproduce the pass.
test log(pass):
@test: Piglit/spec_ARB_gpu_shader5_arb_gpu_shader5-interpolateAtOffset-nonconst
info: @@@Returncode: 0


test case start at: Sat Feb  7 18:50:09 2015
test case end at:   Sat Feb  7 18:50:09 2015

Errors:
libGL: screen 0 does not appear to be DRI3 capable
libGL: pci id for fd 7: 8086:0152, driver i965
libGL: OpenDriver: trying /opt/X11R7/lib/dri/tls/i965_dri.so
libGL: OpenDriver: trying /opt/X11R7/lib/dri/i965_dri.so


Dmesg:

Output:
 bin/arb_gpu_shader5-interpolateAtOffset-nonconst -auto -fbo
PIGLIT: {"result": "pass" }


Bisect on master branch, 092c73a7c32b240a26ffeab2ee475f6d590540b2 fixed it.
commit 092c73a7c32b240a26ffeab2ee475f6d590540b2
Author: Chris Forbes <chrisf at ijw.co.nz>
Date:   Sun Dec 7 10:12:36 2014 +1300

    i965: Fix regs read for FS_OPCODE_INTERP_PER_SLOT_OFFSET

    Dead code elimination was eating the Y offset.

    Fixes the piglit test:
    spec/ARB_gpu_shader5/arb_gpu_shader5-interpolateAtOffset-nonconst

    Signed-off-by: Chris Forbes <chrisf at ijw.co.nz>
    Reviewed-by: Jason Ekstrand <jason.ekstrand at intel.com>

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