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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW Bisected]Piglit spec_arb_shading_language_packing_execution_built-in-functions_vs-unpackSnorm4x8 fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86811">86811</a>
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<th>Summary</th>
<td>[BDW Bisected]Piglit spec_arb_shading_language_packing_execution_built-in-functions_vs-unpackSnorm4x8 fails
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>major
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Drivers/DRI/i965
</td>
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<th>Assignee</th>
<td>mattst88@gmail.com
</td>
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<th>Reporter</th>
<td>huax.lu@intel.com
</td>
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
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<th>CC</th>
<td>idr@freedesktop.org
</td>
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<pre>System Environment:
--------------------------
Platform: BDW
Libdrm:
(master)libdrm-2.4.58-13-gfb4177046de19730a784c3c16e4b73aab0ec6e41
Mesa: (master)91a827624c01d40613e97322632aaffe319540f1
Xserver:
(master)xorg-server-1.16.99.901-17-gc52a2b1ebad56820af932dfbc871701a8b04fd9c
Xf86_video_intel:(master)2.99.916-154-g0f15b8b45bb6de10ce1926db303247a5bd3c1c08
Libva: (master)c095cc6cf08523cd0dffcfe5ac4bce9122527f22
Libva_intel_driver:(master)edbb8cdada09cd116103e68f942b0889fd767391
Kernel: (drm-intel-nightly)904b8529cd69f98b98d33b533a211003f99fb1cd
Bug detailed description:
-----------------------------
It fails on BDW with mesa master branch, works well on 10.4 branch.
spec_arb_shading_language_packing_execution_built-in-functions_vs-unpackUnorm4x8
also fails.
Bisect shows： 94a30bbd4fe5f3eda167819e307f736268fd33f6 is the first bad commit.
commit 94a30bbd4fe5f3eda167819e307f736268fd33f6
Author: Matt Turner <<a href="mailto:mattst88@gmail.com">mattst88@gmail.com</a>>
AuthorDate: Sun Mar 9 20:22:23 2014 -0700
Commit: Matt Turner <<a href="mailto:mattst88@gmail.com">mattst88@gmail.com</a>>
CommitDate: Tue Nov 25 17:29:02 2014 -0800
i965/vec4: Optimize unpackSnorm4x8().
Reduces the number of instructions needed to implement unpackSnorm4x8()
from 16 -> 6.
Reviewed-by: Kenneth Graunke <<a href="mailto:kenneth@whitecape.org">kenneth@whitecape.org</a>>
output:
Probe color at (0,0)
Expected: 0.000000 1.000000 0.000000 1.000000
Observed: 1.000000 0.000000 0.000000 1.000000
PIGLIT: {"result": "fail" }
Reproduce steps:
----------------------------
1. xinit
2. ./bin/shader_runner
generated_tests/spec/arb_shading_language_packing/execution/built-in-functions/vs-unpackSnorm4x8.shader_test
-auto</pre>
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