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 <mattst88@gmail.com> AuthorDate: Sun Mar 9 20:22:23 2014 -0700 Commit: Matt Turner <mattst88@gmail.com> 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 <kenneth@whitecape.org> 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
It also fails on BSW.
Note that this will only be reproducible with the vec4 backend, which you can force-enable with INTEL_DEBUG=vec4vs.
Patch on the list.
Fixed by commit e0137fd6f720e4977466b1760ac02a72c5abceb8 Author: Matt Turner <mattst88@gmail.com> Date: Thu Feb 12 01:42:43 2015 +0000 i965/vec4: Add and use byte-MOV instruction for unpack 4x8. Previously we were using a B/UB source in an Align16 instruction, which is illegal. It for some reason works on all platforms, except Broadwell. Cc: "10.5" <mesa-stable@lists.freedesktop.org> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=86811 Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Verified.Fixed.
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