https://bugs.freedesktop.org/show_bug.cgi?id=100613
Bug ID: 100613
Summary: Regression in Mesa 17 on s390x (zSystems)
Product: Mesa
Version: 17.0
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/swr
Assignee: mesa-dev@lists.freedesktop.org
Reporter: sndir...@suse.de
QA Contact: mesa-dev@lists.freedesktop.org
I've observed a regression in Mesa 17 on s390x (zSystems). It's hard to
describe. Here is a video on Youtube.
https://youtu.be/xaYauE0Kn8E
On the left side glxgears is running on x86_64, on the left side it's running
on s390x(zSystems) - a 64bit bigendian platform. gdm and gnome-shell show a
black screen. I haven't screenhoted that though (since it's boring).
I git bisected Mesa and the culprit patch was
>From e827d9175675aaa6cfc0b981e2a80685fb7b3a74 Mon Sep 17 00:00:00 2001
From: Roland Scheidegger <srol...@vmware.com>
Date: Wed, 21 Dec 2016 04:43:07 +0100
Subject: [PATCH] draw: use SoA fetch, not AoS one
Now that there's some SoA fetch which never falls back, we should always get
results which are better or at least not worse (something like rgba32f will
stay the same).
When reverse-applying this patch on Mesa 17.0.3 the regression on s390x gets
fixed.
Mesa has been compiled with
./configure --host=s390x-ibm-linux-gnu --build=s390x-ibm-linux-gnu
--program-prefix= --disable-dependency-tracking --prefix=/usr
--exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
--datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
--libexecdir=/usr/lib --localstatedir=/var --sharedstatedir=/usr/com
--mandir=/usr/share/man --infodir=/usr/share/info --disable-dependency-tracking
--enable-gles1 --enable-gles2 --enable-dri --with-egl-platforms=x11,drm
--enable-shared-glapi --enable-texture-float --enable-osmesa --enable-dri3
--enable-shader-cache --enable-gbm --enable-glx-tls
--with-dri-searchpath=/usr/lib64/dri --enable-gallium-llvm
--enable-llvm-shared-libs --enable-vdpau --enable-va --enable-xvmc
--with-dri-drivers=swrast --with-gallium-drivers=swrast
'CFLAGS=-fmessage-length=0 -grecord-gcc-switches -fstack-protector -O2 -Wall
-D_FORTIFY_SOURCE=2 -funwind-tables -fasynchronous-unwind-tables -g -DNDEBUG'
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