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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Priority</th>
<td>high
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [i965 Bisected]Piglit/spec/ARB_vertex_program/vp-sge-alias fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76616">76616</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>idr@freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>mattst88@gmail.com
</td>
</tr>
<tr>
<th>Summary</th>
<td>[i965 Bisected]Piglit/spec/ARB_vertex_program/vp-sge-alias fails
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>huax.lu@intel.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>Drivers/DRI/i965
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
</tr></table>
<p>
<div>
<pre>System Environment:
--------------------------
Platform: Ironlake
Libdrm:
(master)libdrm-2.4.52-10-g1cb5fc706cf5913d9dee33c939f65a23ecea17a5
Mesa: (master)7683fce8781ef0169333c5ee1276392d058cfaa8
Xserver:
(master)xorg-server-1.15.99.901-129-gbf087659f0fb747c471e26c5b287c35877818040
Xf86_video_intel:(master)2.99.911-3-g220accd828c5a0054ae9e3b491a434f7a6c750e0
Cairo: (master)bb17403622e9ea474017e0039af8ee48b2b285db
Libva: (staging)bf2e1773d4373619232c4c653b8cda19ea329441
Libva_intel_driver:(staging)b1319c7f7cb9d20179b20dac2308330bd0e51ffe
Kernel: (drm-intel-nightly)84295583b8322f96a187c4fc5cca5dd7d511f57e
Bug detailed description:
-----------------------------
It fails on Ironlake, Sandybridge, Ivybridge, Haswell, Baytrail and broadwell
with mesa master branch.It doesn't happen on mesa 10.1 branch.
Bisect shows:9cd51bb0c4608258199c69bc7738e72f055799d2 is the first bad commit.
commit 9cd51bb0c4608258199c69bc7738e72f055799d2
Author: Matt Turner <<a href="mailto:mattst88@gmail.com">mattst88@gmail.com</a>>
AuthorDate: Tue Mar 11 13:16:37 2014 -0700
Commit: Matt Turner <<a href="mailto:mattst88@gmail.com">mattst88@gmail.com</a>>
CommitDate: Mon Mar 24 11:06:26 2014 -0700
i965/vec4: Eliminate writes that are never read.
With an awful O(n^2) algorithm that searches previous instructions for
dead writes.
total instructions in shared programs: 805582 -> 788074 (-2.17%)
instructions in affected programs: 144561 -> 127053 (-12.11%)
Reviewed-by: Eric Anholt <<a href="mailto:eric@anholt.net">eric@anholt.net</a>>
output:
Probe color at (75,75)
Expected: 1.000000 0.000000 1.000000 1.000000
Observed: 0.000000 0.000000 1.000000 1.000000
Test /GFX/Test/Piglit/piglit/tests/shaders/generic/vp-sge-alias.vpfp:16 failed
PIGLIT: {'result': 'fail' }
Reproduce steps:
----------------------------
1. xinit
2. ./bin/vpfp-generic
/GFX/Test/Piglit/piglit/tests/shaders/generic/vp-sge-alias.vpfp -fbo -auto</pre>
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