* [Bug tree-optimization/111465] [14 regression] stage 3 ICE kills bootstrap
2023-09-18 20:26 [Bug bootstrap/111465] New: [14 regression] stage 3 ICE kills bootstrap seurer at gcc dot gnu.org
@ 2023-09-18 20:48 ` pinskia at gcc dot gnu.org
2023-09-18 21:41 ` seurer at gcc dot gnu.org
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From: pinskia at gcc dot gnu.org @ 2023-09-18 20:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111465
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|bootstrap |tree-optimization
Target Milestone|--- |14.0
Keywords| |build, ice-checking,
| |ice-on-valid-code
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I suspect this was caused by/exposed by r14-4089-gd45ddc2c04e471d0dcee01 .
Do you have the preprocessed source which you could attach?
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2023-09-18 20:48 ` [Bug tree-optimization/111465] " pinskia at gcc dot gnu.org
@ 2023-09-18 21:41 ` seurer at gcc dot gnu.org
2023-09-18 21:54 ` pinskia at gcc dot gnu.org
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From: seurer at gcc dot gnu.org @ 2023-09-18 21:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111465
--- Comment #2 from seurer at gcc dot gnu.org ---
Created attachment 55926
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55926&action=edit
preprocessed .ii file
Yup, that looks like the culprit.
Preprocessed file attached.
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2023-09-18 20:48 ` [Bug tree-optimization/111465] " pinskia at gcc dot gnu.org
2023-09-18 21:41 ` seurer at gcc dot gnu.org
@ 2023-09-18 21:54 ` pinskia at gcc dot gnu.org
2023-09-18 22:32 ` [Bug tree-optimization/111465] [14 regression] stage 3 ICE kills bootstrap from r14-4089-gd45ddc2c04e471d0dcee01 pinskia at gcc dot gnu.org
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From: pinskia at gcc dot gnu.org @ 2023-09-18 21:54 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reproduced, reducing ...
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2023-09-18 21:54 ` pinskia at gcc dot gnu.org
@ 2023-09-18 22:32 ` pinskia at gcc dot gnu.org
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From: pinskia at gcc dot gnu.org @ 2023-09-18 22:32 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 55927
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55927&action=edit
reduced somewhat
Compile with `-O2 -fno-exceptions`.
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2023-09-18 20:26 [Bug bootstrap/111465] New: [14 regression] stage 3 ICE kills bootstrap seurer at gcc dot gnu.org
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2023-09-18 22:32 ` [Bug tree-optimization/111465] [14 regression] stage 3 ICE kills bootstrap from r14-4089-gd45ddc2c04e471d0dcee01 pinskia at gcc dot gnu.org
@ 2023-09-18 22:40 ` pinskia at gcc dot gnu.org
2023-09-18 23:23 ` pinskia at gcc dot gnu.org
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From: pinskia at gcc dot gnu.org @ 2023-09-18 22:40 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111465
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2023-09-18
Target|powerpc64le-linux-gnu |
Build|powerpc64le-linux-gnu |
Host|powerpc64le-linux-gnu |
Status|UNCONFIRMED |NEW
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4)
> Created attachment 55927 [details]
> reduced somewhat
>
> Compile with `-O2 -fno-exceptions`.
This reduced testcase fails on x86_64-linux-gnu with `-O2 -fno-exceptions
--param=logical-op-non-short-circuit=0`
Confirmed.
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@ 2023-09-18 23:23 ` pinskia at gcc dot gnu.org
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From: pinskia at gcc dot gnu.org @ 2023-09-18 23:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111465
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 55928
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55928&action=edit
Reduced even further
Still requires `-O2 -fno-exceptions --param=logical-op-non-short-circuit=0` to
reproduce.
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@ 2023-09-18 23:30 ` pinskia at gcc dot gnu.org
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From: pinskia at gcc dot gnu.org @ 2023-09-18 23:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111465
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
```
Optimizing block #15
1>>> STMT 1 = prephitmp_58 le_expr location_138
1>>> STMT 1 = prephitmp_58 ge_expr location_138
1>>> STMT 1 = prephitmp_58 eq_expr location_138
1>>> STMT 0 = prephitmp_58 ne_expr location_138
Optimizing statement if (iftmp.2_137 <= location_138)
Replaced 'iftmp.2_137' with constant '2147483648'
Applying pattern match.pd:6895, gimple-match-8.cc:2512
Applying pattern match.pd:5745, gimple-match-4.cc:2113
gimple_simplified to _192 = (signed int) location_138;
if (_192 < 0)
Folded to: if (_192 < 0)
Registering value_relation (_192 pe32 location_138) (bb15) at _192 = (signed
int) location_138;
Folding predicate _192 < 0 to 0
Optimizing statement _192 = (signed int) location_138;
LKUP STMT _192 = nop_expr location_138
2>>> STMT _192 = nop_expr location_138
Optimizing block #16
Optimizing statement _16 = (signed int) prephitmp_15;
Replaced 'prephitmp_15' with variable 'location_138'
LKUP STMT _16 = nop_expr location_138
FIND: _192
Replaced redundant expr '(signed int) location_138' with '_192'
==== ASGN _16 = _192
Optimizing statement if (_16 < 0)
Replaced '_16' with variable '_192'
Folding predicate _192 < 0 to 0
Marking all outgoing edges of unreachable BB 17 as not executable
<<<< STMT _192 = nop_expr location_138
<<<< STMT 0 = prephitmp_58 ne_expr location_138
<<<< STMT 1 = prephitmp_58 eq_expr location_138
<<<< STMT 1 = prephitmp_58 ge_expr location_138
<<<< STMT 1 = prephitmp_58 le_expr location_138
<<<< COPY prephitmp_15 = location_138
```
But _16 is no longer used ...
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From: rguenth at gcc dot gnu.org @ 2023-09-19 9:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111465
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will have a look.
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From: rguenth at gcc dot gnu.org @ 2023-09-19 10:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111465
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=102844
CC| |law at gcc dot gnu.org
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
So we simplify
if (iftmp.2_137 <= location_138)
..
else
{
_16 = (signed) prephitmp_15;
if (_16 < 0)
...
to
_192 = (signed) location_138;
if (0)
..
else
{
_16 = (signed) prephitmp_15;
if (_16 < 0)
...
and then thread - actually we have registered the forward thread already
and registered the block with the def of _192 as EDGE_NO_COPY_SRC_BLOCK
(because it was empty before). This is essentially a duplicate of PR102844
which has gone latent.
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From: rguenth at gcc dot gnu.org @ 2023-09-19 10:39 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Testing a patch.
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From: cvs-commit at gcc dot gnu.org @ 2023-09-19 11:24 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:564ecb7d5afb0bb4eb39285ce65c631490e37dce
commit r14-4128-g564ecb7d5afb0bb4eb39285ce65c631490e37dce
Author: Richard Biener <rguenther@suse.de>
Date: Tue Sep 19 12:36:04 2023 +0200
tree-optimization/111465 - bougs jump threading with no-copy src block
The following avoids to forward thread a path with a EDGE_NO_COPY_SRC_BLOCK
block that became non-empty due to folding.
PR tree-optimization/111465
* tree-ssa-threadupdate.cc (fwd_jt_path_registry::thread_block_1):
Cancel the path when a EDGE_NO_COPY_SRC_BLOCK became non-empty.
* g++.dg/torture/pr111465.C: New testcase.
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From: rguenth at gcc dot gnu.org @ 2023-09-19 11:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111465
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|ASSIGNED |RESOLVED
--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
Should be fixed on trunk. Given PR102844 the issue is latent everywhere,
marking as duplicate for this.
*** This bug has been marked as a duplicate of bug 102844 ***
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From: cvs-commit at gcc dot gnu.org @ 2023-11-24 15:13 UTC (permalink / raw)
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--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:152400decc8383aeff9a9ad8262b9e7e2fff61e0
commit r13-8096-g152400decc8383aeff9a9ad8262b9e7e2fff61e0
Author: Richard Biener <rguenther@suse.de>
Date: Tue Sep 19 12:36:04 2023 +0200
tree-optimization/111465 - bougs jump threading with no-copy src block
The following avoids to forward thread a path with a EDGE_NO_COPY_SRC_BLOCK
block that became non-empty due to folding.
PR tree-optimization/111465
* tree-ssa-threadupdate.cc (fwd_jt_path_registry::thread_block_1):
Cancel the path when a EDGE_NO_COPY_SRC_BLOCK became non-empty.
* g++.dg/torture/pr111465.C: New testcase.
(cherry picked from commit 564ecb7d5afb0bb4eb39285ce65c631490e37dce)
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