https://bugs.freedesktop.org/show_bug.cgi?id=94091
Bug ID: 94091
Summary: Tonga unreal elemental segfault since radeonsi: put
image, fmask, and sampler descriptors into one array
Product: Mesa
Version: git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/radeonsi
Assignee: dri-devel at lists.freedesktop.org
Reporter: adf.lists at gmail.com
QA Contact: dri-devel at lists.freedesktop.org
Created attachment 121675
--> https://bugs.freedesktop.org/attachment.cgi?id=121675&action=edit
gdb bt
R9285 since mesa commit below Unreal ElementalDemo quits at start with a
segfault.
gdb from demo generated core attached
commit 7aedbbacae6d3ec3d06735fff2eb662964773ad2
Author: Marek Olšák <marek.olsak at amd.com>
Date: Sat Feb 6 22:09:45 2016 +0100
radeonsi: put image, fmask, and sampler descriptors into one array
The texture slot is expanded to 16 dwords containing 2 descriptors.
Those can be:
- Image and fmask, or
- Image and sampler state
By carefully choosing the locations, we can put all three into one slot,
with the fmask and sampler state being mutually exclusive.
This improves shaders in 2 ways:
- 2 user SGPRs are unused, shaders can use them as temporary registers now
- each pair of descriptors is always on the same cache line
v2: cosmetic changes: add back v8i32, don't load a sampler state & fmask
at the same time
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