From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 94091] Tonga unreal elemental segfault since radeonsi: put
image, fmask, and sampler descriptors into one array
Date: Thu, 11 Feb 2016 14:30:59 +0000
Message-ID:
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@lists.freedesktop.org
Reporter
adf.lists@gmail.com
QA Contact
dri-devel@lists.freedesktop.org
Created attachment 121675 [details]
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@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