https://bugs.freedesktop.org/show_bug.cgi?id=103142
Bug ID: 103142
Summary: R600g+sb: optimizer apparently stuck in an endless
loop
Product: Mesa
Version: git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/r600
Assignee: dri-devel@lists.freedesktop.org
Reporter: gw.foss...@gmail.com
QA Contact: dri-devel@lists.freedesktop.org
Created attachment 134738
--> https://bugs.freedesktop.org/attachment.cgi?id=134738&action=edit
TGSI, byte code and logging output
With sb enabled some shaders apparently trigger an endless loops in the sb
optimizer.
The attached TGSI and log of a shader triggering this behaviour comes from the
Unreal Editor version 4.17.1,
The log was created with
#define PSC_DEBUG 1
in src/gallium/drivers/r600/sb_sched.cpp
The problem is probably related to the "FIXME rework this loop" on line 1808 in
the same file, and I also have the impression that it has something to do with
MULADD when the sources are a mix of CONST and IMM.
I'd try to fix it myself, but right now I don't really have a clue how to
approach this bug.
best,
Gert
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