* [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop
@ 2017-10-07 22:37 bugzilla-daemon
2017-10-09 7:51 ` bugzilla-daemon
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: bugzilla-daemon @ 2017-10-07 22:37 UTC (permalink / raw)
To: dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 1422 bytes --]
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.fossdev@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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^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop
2017-10-07 22:37 [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop bugzilla-daemon
@ 2017-10-09 7:51 ` bugzilla-daemon
2017-10-09 19:54 ` bugzilla-daemon
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2017-10-09 7:51 UTC (permalink / raw)
To: dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 10561 bytes --]
https://bugs.freedesktop.org/show_bug.cgi?id=103142
Gert Wollny <gw.fossdev@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #134738|0 |1
is obsolete| |
--- Comment #1 from Gert Wollny <gw.fossdev@gmail.com> ---
Created attachment 134759
--> https://bugs.freedesktop.org/attachment.cgi?id=134759&action=edit
Shader triggering the endless loop
I think the last log was not correct, i.e. it was not the right shader. This
new log shows different error messages. The the endless loop is happening in
"post_scheduler".
I've run the code with R600_DEBUG=nocw,sbdump in addition to the PSC_DUMP.
I've also tried R600_DEBUG=sbsafemath, but to no avail.
Snip of the log:
# REGMAP :
current_AR: R42.x.199||@R1.x
current_AR is R42.x.199||@R1.x trying to use R41.x.235||@R0.z
current_AR is R42.x.199||@R1.x trying to use R42.x.200@R10.w
current_AR is R42.x.199||@R1.x trying to use R44.x.77@R7.z
!!!!!! interf slot: 2 : ADD t116||@R2.z,
A100.y[R41.x.235||@R0.z]_763F@R8.y, A100.y[R43.x.126@R2.z]_764F@R8.y
rels:
A100.y[R41.x.235||@R0.z]_763F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
rels:
A100.y[R43.x.126@R2.z]_764F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
!!!!!! interf slot: 3 : MOV R43.z.49||@R10.w,
A100.y[R42.x.200@R10.w]_759F@R8.y
rels:
A100.y[R42.x.200@R10.w]_759F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
!!!!!! interf slot: 4 : MOV R43.y.48||@R12.z,
A100.x[R44.x.77@R7.z]_755F@R8.x
rels:
A100.x[R44.x.77@R7.z]_755F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
ci: discarding slots 28
discard_slots : packed_ops : 0
discarding slot 2 : ADD t116||@R2.z, A100.y[R41.x.235||@R0.z]_763F@R8.y,
A100.y[R43.x.126@R2.z]_764F@R8.y
rels:
A100.y[R41.x.235||@R0.z]_763F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
rels:
A100.y[R43.x.126@R2.z]_764F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
discarding slot 3 : MOV R43.z.49||@R10.w,
A100.y[R42.x.200@R10.w]_759F@R8.y
rels:
A100.y[R42.x.200@R10.w]_759F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
discarding slot 4 : MOV R43.y.48||@R12.z,
A100.x[R44.x.77@R7.z]_755F@R8.x
rels:
A100.x[R44.x.77@R7.z]_755F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
check_interferences: after:
# REGMAP :
current_AR: R42.x.199||@R1.x
update_local_interferences : [R26.x.7F R26.y.7F R26.z.7F R27.x.7F R27.y.7F
R27.z.7F R28.x.7F R28.y.7F R28.z.7F R100.x.1F R101.x.1F R100.y.1F R101.y.1F
R102.x.1F R102.y.1F R103.x.1F R104.x.1F R103.y.1F R104.y.1F R105.x.1F R105.y.1F
R106.x.1F R107.x.1F R106.y.1F R107.y.1F R108.x.1F R108.y.1F R109.x.1F R109.y.1F
R4.x.410||@R6.w R41.x.194||@R4.y R42.x.184||@R2.y R43.x.112||@R12.y
R43.y.43||@R14.w R41.x.202||@R0.w R42.x.188||@R1.z R43.x.114||@R13.w
R43.y.44||@R7.w R4.x.423||@R5.w R41.x.213||@R2.w R42.x.195||@R3.y
R43.x.119||@R17.w R43.y.48||@R12.z R43.z.48||@R10.w R41.x.221||@R0.y
R42.x.199||@R1.x R44.x.78||@R3.x R43.z.49||@R10.w R4.x.436||@R4.w
R40.x.206||@R1.y R41.x.231||@R1.w R42.x.206||@R16.z R42.y.71||@R10.z
R42.z.71||@R8.w R40.x.214||@R0.x R41.x.235||@R0.z R42.x.208||@R9.z
R42.y.72||@R3.z R42.z.72||@R8.w t111||@R8.z t112||@R13.z t113||@R7.z
t114||@R3.x t115||@R3.w t116||@R2.z ]
p_a_g: MOV R42.x.206||@R16.z, A100.x[R41.x.231||@R1.w]_760F@R8.x
rels:
A100.x[R41.x.231||@R1.w]_760F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
slot: 2
current group:
slot 2 : MOV R42.x.206||@R16.z, A100.x[R41.x.231||@R1.w]_760F@R8.x
rels:
A100.x[R41.x.231||@R1.w]_760F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
p_a_g: MOV R43.z.48||@R10.w, A100.x[R42.x.196@R11.z]_756F@R8.x
rels:
A100.x[R42.x.196@R11.z]_756F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
slot: 3
current group:
slot 2 : MOV R42.x.206||@R16.z, A100.x[R41.x.231||@R1.w]_760F@R8.x
rels:
A100.x[R41.x.231||@R1.w]_760F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
slot 3 : MOV R43.z.48||@R10.w, A100.x[R42.x.196@R11.z]_756F@R8.x
rels:
A100.x[R42.x.196@R11.z]_756F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
p_a_g: MOV R42.z.72||@R8.w, A100.y[R41.x.236@R8.w]_765F@R8.y
rels:
A100.y[R41.x.236@R8.w]_765F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
slot: 4
current group:
slot 2 : MOV R42.x.206||@R16.z, A100.x[R41.x.231||@R1.w]_760F@R8.x
rels:
A100.x[R41.x.231||@R1.w]_760F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
slot 3 : MOV R43.z.48||@R10.w, A100.x[R42.x.196@R11.z]_756F@R8.x
rels:
A100.x[R42.x.196@R11.z]_756F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
slot 4 : MOV R42.z.72||@R8.w, A100.y[R41.x.236@R8.w]_765F@R8.y
rels:
A100.y[R41.x.236@R8.w]_765F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
p_a_g: ADD t112||@R13.z, A100.y[R42.x.188||@R1.z]_749F@R8.y,
A100.y[R44.x.73@R2.x]_750F@R8.y
rels:
A100.y[R42.x.188||@R1.z]_749F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
rels:
A100.y[R44.x.73@R2.x]_750F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
no suitable slots
p_a_g: ADD t115||@R3.w, A100.x[R41.x.231||@R1.w]_760F@R8.x,
A100.x[R43.x.125@R3.w]_761F@R8.x
rels:
A100.x[R41.x.231||@R1.w]_760F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
rels:
A100.x[R43.x.125@R3.w]_761F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
no suitable slots
p_a_g: MOV R43.x.114||@R13.w, A100.y[R42.x.188||@R1.z]_749F@R8.y
rels:
A100.y[R42.x.188||@R1.z]_749F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
no suitable slots
p_a_g: ADD t113||@R7.z, A100.x[R42.x.195||@R3.y]_754F@R8.x,
A100.x[R44.x.77@R7.z]_755F@R8.x
rels:
A100.x[R42.x.195||@R3.y]_754F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
rels:
A100.x[R44.x.77@R7.z]_755F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
no suitable slots
p_a_g: MOV R42.z.71||@R8.w, A100.x[R41.x.232@R15.w]_762F@R8.x
rels:
A100.x[R41.x.232@R15.w]_762F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
no suitable slots
p_a_g: MOV R42.y.72||@R3.z, A100.y[R43.x.126@R2.z]_764F@R8.y
rels:
A100.y[R43.x.126@R2.z]_764F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
no suitable slots
p_a_g: ADD t111||@R8.z, A100.x[R42.x.184||@R2.y]_744F@R8.x,
A100.x[R44.x.72@R8.z]_745F@R8.x
rels:
A100.x[R42.x.184||@R2.y]_744F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
rels:
A100.x[R44.x.72@R8.z]_745F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
no suitable slots
p_a_g: MOV R43.y.43||@R14.w, A100.x[R44.x.72@R8.z]_745F@R8.x
rels:
A100.x[R44.x.72@R8.z]_745F@R8.x : <= R100.x.1F, R101.x.1F, R102.x.1F,
R103.x.1F, R104.x.1F, R105.x.1F, R106.x.1F, R107.x.1F, R108.x.1F, R109.x.1F
no suitable slots
p_a_g: MOV R42.x.208||@R9.z, A100.y[R41.x.235||@R0.z]_763F@R8.y
rels:
A100.y[R41.x.235||@R0.z]_763F@R8.y : <= R100.y.1F, R101.y.1F, R102.y.1F,
R103.y.1F, R104.y.1F, R105.y.1F, R106.y.1F, R107.y.1F, R108.y.1F, R109.y.1F
no suitable slots
...
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^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop
2017-10-07 22:37 [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop bugzilla-daemon
2017-10-09 7:51 ` bugzilla-daemon
@ 2017-10-09 19:54 ` bugzilla-daemon
2017-10-10 10:23 ` bugzilla-daemon
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2017-10-09 19:54 UTC (permalink / raw)
To: dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 333 bytes --]
https://bugs.freedesktop.org/show_bug.cgi?id=103142
--- Comment #2 from Gert Wollny <gw.fossdev@gmail.com> ---
In summary, the optimizer gets stuck in an infinite loop in schedule_alu,
because prepare_alu_group() does not find a proper scheduling.
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You are the assignee for the bug.
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https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop
2017-10-07 22:37 [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop bugzilla-daemon
2017-10-09 7:51 ` bugzilla-daemon
2017-10-09 19:54 ` bugzilla-daemon
@ 2017-10-10 10:23 ` bugzilla-daemon
2017-10-10 10:25 ` bugzilla-daemon
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2017-10-10 10:23 UTC (permalink / raw)
To: dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 346 bytes --]
https://bugs.freedesktop.org/show_bug.cgi?id=103142
--- Comment #3 from Gert Wollny <gw.fossdev@gmail.com> ---
Created attachment 134771
--> https://bugs.freedesktop.org/attachment.cgi?id=134771&action=edit
Patch to fix shader in UE4 (added for completeness)
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You are the assignee for the bug.
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^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop
2017-10-07 22:37 [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop bugzilla-daemon
` (2 preceding siblings ...)
2017-10-10 10:23 ` bugzilla-daemon
@ 2017-10-10 10:25 ` bugzilla-daemon
2017-11-09 15:33 ` bugzilla-daemon
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2017-10-10 10:25 UTC (permalink / raw)
To: dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 582 bytes --]
https://bugs.freedesktop.org/show_bug.cgi?id=103142
--- Comment #4 from Gert Wollny <gw.fossdev@gmail.com> ---
The bug can be triggered on BARTS (6850 HD) by using the Unreal Engine 4.17.1
or 4.18.0-pre3 with this patch applied [1] to fix a shader that otherwise would
use too many registers.
(Note that in mesa-debug mode UE4Editor will likely crash at one point because
of
#102387 [2])
[1] Attached "Patch to fix shader in UE4"
[2] https://bugs.freedesktop.org/show_bug.cgi?id=102387
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^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop
2017-10-07 22:37 [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop bugzilla-daemon
` (3 preceding siblings ...)
2017-10-10 10:25 ` bugzilla-daemon
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From: bugzilla-daemon @ 2017-11-09 15:33 UTC (permalink / raw)
To: dri-devel
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https://bugs.freedesktop.org/show_bug.cgi?id=103142
--- Comment #5 from Emil Velikov <emil.l.velikov@gmail.com> ---
Gert, should we close this considering 69eee511c63 ("r600/sb: bail out if
prepare_alu_group() doesn't find a proper scheduling") has landed?
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* [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop
2017-10-07 22:37 [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop bugzilla-daemon
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7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2017-11-09 17:07 UTC (permalink / raw)
To: dri-devel
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https://bugs.freedesktop.org/show_bug.cgi?id=103142
--- Comment #6 from Gert Wollny <gw.fossdev@gmail.com> ---
In debug mode an assertion fires as a reminder that this patch only works
around the real, yet to be understood bug. For that reason I think it would be
better to keep it open (At least the aforementioned bug #102387 is of a similar
nature).
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* [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop
2017-10-07 22:37 [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop bugzilla-daemon
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2018-02-07 17:32 ` bugzilla-daemon
7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2018-02-07 17:28 UTC (permalink / raw)
To: dri-devel
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https://bugs.freedesktop.org/show_bug.cgi?id=103142
--- Comment #7 from Gert Wollny <gw.fossdev@gmail.com> ---
It seems sb is trying to create an operation that tries to use two distinct
relative indices within the same instruction, this is forbidden and the
scheduler gets stuck.
from the post scheduler dump:
# 0.y => t175||FP@R0.y
# 0.z => t194||FP@R0.z
new current_AR assigned: R13.x.235@R0.w
current_AR is R13.x.235@R0.w trying to use R15.x.126@R1.x
current_AR is R13.x.235@R0.w trying to use R15.x.126@R1.x
!!!!!! interf slot: 0 :
ADD t80@R1.x, A26.y[R13.x.235@R0.w]_608F@R5.y, \
A26.y[R15.x.126@R1.x]_609F@R5.y
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* [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop
2017-10-07 22:37 [Bug 103142] R600g+sb: optimizer apparently stuck in an endless loop bugzilla-daemon
` (6 preceding siblings ...)
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7 siblings, 0 replies; 9+ messages in thread
From: bugzilla-daemon @ 2018-02-07 17:32 UTC (permalink / raw)
To: dri-devel
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https://bugs.freedesktop.org/show_bug.cgi?id=103142
Gert Wollny <gw.fossdev@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
QA Contact|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
|.org |org
Assignee|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
|.org |org
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