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* [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
@ 2013-11-25 11:44 ktkachov at gcc dot gnu.org
2013-11-25 15:29 ` [Bug middle-end/59285] [4.9 Regression] " rguenth at gcc dot gnu.org
` (13 more replies)
0 siblings, 14 replies; 15+ messages in thread
From: ktkachov at gcc dot gnu.org @ 2013-11-25 11:44 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
Bug ID: 59285
Summary: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler
error: in rtl_verify_fallthru, at cfgrtl.c:2862
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: ktkachov at gcc dot gnu.org
The gcc.dg/builtin-unreachable-6.c testcase fails on arm-none-eabi with:
$SRC/gcc/gcc/testsuite/gcc.dg/builtin-unreachable-6.c: In function 'foo':
$SRC/gcc/gcc/testsuite/gcc.dg/builtin-unreachable-6.c:17:1: error:
verify_flow_info: Incorrect fallthru 2->5
$SRC/gcc/gcc/testsuite/gcc.dg/builtin-unreachable-6.c:17:1: error: wrong insn
in the fallthru edge
(barrier 21 20 27)
$SRC/gcc/gcc/testsuite/gcc.dg/builtin-unreachable-6.c:17:1: internal compiler
error: in rtl_verify_fallthru, at cfgrtl.c:2862
0x95d645 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
$SRC/gcc/gcc/rtl-error.c:109
0x69254a rtl_verify_fallthru
$SRC/gcc/gcc/cfgrtl.c:2862
0x69254a rtl_verify_flow_info
$SRC/gcc/gcc/cfgrtl.c:2962
0x681af7 verify_flow_info()
$SRC/gcc/gcc/cfghooks.c:258
0xe5c24f if_convert
$SRC/gcc/gcc/ifcvt.c:4460
0xe5d95d rest_of_handle_if_after_reload
$SRC/gcc/gcc/ifcvt.c:4594
0xe5d95d execute
$SRC/gcc/gcc/ifcvt.c:4625
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
Bisection shows it started with r205074:
* tree-ssa-threadedge.c (thread_across_edge): After threading
through a joiner, allow threading a normal block requiring
duplication.
* tree-ssa-threadupdate.c (thread_block_1): Improve code to detect
jump threading requests that would muck up the loop structures.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
@ 2013-11-25 15:29 ` rguenth at gcc dot gnu.org
2013-11-25 16:20 ` law at redhat dot com
` (12 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-11-25 15:29 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |4.9.0
Summary|gcc.dg/builtin-unreachable- |[4.9 Regression]
|6.c:17:1: internal compiler |gcc.dg/builtin-unreachable-
|error: in |6.c:17:1: internal compiler
|rtl_verify_fallthru, at |error: in
|cfgrtl.c:2862 |rtl_verify_fallthru, at
| |cfgrtl.c:2862
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
2013-11-25 15:29 ` [Bug middle-end/59285] [4.9 Regression] " rguenth at gcc dot gnu.org
@ 2013-11-25 16:20 ` law at redhat dot com
2013-11-25 20:13 ` law at redhat dot com
` (11 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: law at redhat dot com @ 2013-11-25 16:20 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2013-11-25
Ever confirmed|0 |1
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
2013-11-25 15:29 ` [Bug middle-end/59285] [4.9 Regression] " rguenth at gcc dot gnu.org
2013-11-25 16:20 ` law at redhat dot com
@ 2013-11-25 20:13 ` law at redhat dot com
2013-11-26 18:51 ` law at redhat dot com
` (10 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: law at redhat dot com @ 2013-11-25 20:13 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
--- Comment #1 from Jeffrey A. Law <law at redhat dot com> ---
Patch in testing.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
` (2 preceding siblings ...)
2013-11-25 20:13 ` law at redhat dot com
@ 2013-11-26 18:51 ` law at redhat dot com
2013-12-05 17:17 ` law at redhat dot com
` (9 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: law at redhat dot com @ 2013-11-26 18:51 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
--- Comment #2 from Jeffrey A. Law <law at redhat dot com> ---
After sleeping on it, I think a different approach to the fix is going to be
better. This is a latent bug in the RTL conditional execution/block merging
code.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
` (3 preceding siblings ...)
2013-11-26 18:51 ` law at redhat dot com
@ 2013-12-05 17:17 ` law at redhat dot com
2013-12-05 17:21 ` ktkachov at gcc dot gnu.org
` (8 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: law at redhat dot com @ 2013-12-05 17:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
--- Comment #3 from Jeffrey A. Law <law at redhat dot com> ---
Working on this again. I'm on the 4th iteration of the fix. Bootstrapping on
ARM boxes is painfully slow :(
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
` (4 preceding siblings ...)
2013-12-05 17:17 ` law at redhat dot com
@ 2013-12-05 17:21 ` ktkachov at gcc dot gnu.org
2013-12-05 17:27 ` law at redhat dot com
` (7 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: ktkachov at gcc dot gnu.org @ 2013-12-05 17:21 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
--- Comment #4 from ktkachov at gcc dot gnu.org ---
(In reply to Jeffrey A. Law from comment #3)
> Working on this again. I'm on the 4th iteration of the fix. Bootstrapping
> on ARM boxes is painfully slow :(
I could bootstrap a patch on arm-none-linux-gnueabihf if you'd like.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
` (5 preceding siblings ...)
2013-12-05 17:21 ` ktkachov at gcc dot gnu.org
@ 2013-12-05 17:27 ` law at redhat dot com
2013-12-05 17:33 ` ktkachov at gcc dot gnu.org
` (6 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: law at redhat dot com @ 2013-12-05 17:27 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
--- Comment #5 from Jeffrey A. Law <law at redhat dot com> ---
How fast is your box? I'm using 4 processors on a calxeda system... It's
painful, particularly when the first calxeda box's disk died, thus losing my
build trees & test results.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
` (6 preceding siblings ...)
2013-12-05 17:27 ` law at redhat dot com
@ 2013-12-05 17:33 ` ktkachov at gcc dot gnu.org
2013-12-19 14:17 ` yufeng at gcc dot gnu.org
` (5 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: ktkachov at gcc dot gnu.org @ 2013-12-05 17:33 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
--- Comment #6 from ktkachov at gcc dot gnu.org ---
(In reply to Jeffrey A. Law from comment #5)
> How fast is your box? I'm using 4 processors on a calxeda system... It's
> painful, particularly when the first calxeda box's disk died, thus losing my
> build trees & test results.
I'm using a Chromebook with 2 Cortex-A15s.
I think it took about 5-6 hours to bootstrap last time I tried.
I have a feeling your system might be faster :(
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
` (7 preceding siblings ...)
2013-12-05 17:33 ` ktkachov at gcc dot gnu.org
@ 2013-12-19 14:17 ` yufeng at gcc dot gnu.org
2013-12-19 15:35 ` rguenth at gcc dot gnu.org
` (4 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: yufeng at gcc dot gnu.org @ 2013-12-19 14:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
Yufeng Zhang <yufeng at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |yufeng at gcc dot gnu.org
--- Comment #7 from Yufeng Zhang <yufeng at gcc dot gnu.org> ---
What is the current status?
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
` (8 preceding siblings ...)
2013-12-19 14:17 ` yufeng at gcc dot gnu.org
@ 2013-12-19 15:35 ` rguenth at gcc dot gnu.org
2013-12-19 15:54 ` law at redhat dot com
` (3 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: rguenth at gcc dot gnu.org @ 2013-12-19 15:35 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
` (9 preceding siblings ...)
2013-12-19 15:35 ` rguenth at gcc dot gnu.org
@ 2013-12-19 15:54 ` law at redhat dot com
2013-12-24 20:22 ` steven at gcc dot gnu.org
` (2 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: law at redhat dot com @ 2013-12-19 15:54 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
--- Comment #8 from Jeffrey A. Law <law at redhat dot com> ---
I have multiple fixes. Steven and I disagree on which is better.
Having Richi or Jakub chime in with their opinions would help -- if they agree
with Steven, then I'll go with the majority. If they prefer mine, then that's
what we'll go with.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
` (10 preceding siblings ...)
2013-12-19 15:54 ` law at redhat dot com
@ 2013-12-24 20:22 ` steven at gcc dot gnu.org
2014-01-08 5:56 ` law at gcc dot gnu.org
2014-01-08 5:57 ` law at redhat dot com
13 siblings, 0 replies; 15+ messages in thread
From: steven at gcc dot gnu.org @ 2013-12-24 20:22 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
Steven Bosscher <steven at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |steven at gcc dot gnu.org
--- Comment #9 from Steven Bosscher <steven at gcc dot gnu.org> ---
(In reply to Jeffrey A. Law from comment #8)
> I have multiple fixes. Steven and I disagree on which is better.
>
> Having Richi or Jakub chime in with their opinions would help -- if they
> agree with Steven, then I'll go with the majority. If they prefer mine,
> then that's what we'll go with.
I've proposed an alternative here:
http://gcc.gnu.org/ml/gcc-patches/2013-12/msg01871.html
It's not quite perfect, but it's conservative.
IMHO we should address the bigger issue (what does builtin_unreachable mean,
also on non-cond_exec targets?) for the next GCC stage1.
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
` (11 preceding siblings ...)
2013-12-24 20:22 ` steven at gcc dot gnu.org
@ 2014-01-08 5:56 ` law at gcc dot gnu.org
2014-01-08 5:57 ` law at redhat dot com
13 siblings, 0 replies; 15+ messages in thread
From: law at gcc dot gnu.org @ 2014-01-08 5:56 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
--- Comment #10 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed Jan 8 05:56:31 2014
New Revision: 206417
URL: http://gcc.gnu.org/viewcvs?rev=206417&root=gcc&view=rev
Log:
PR middle-end/59285
* ifcvt.c (merge_if_block): If we are merging a block with more than
one successor with a block with no successors, remove any BARRIER
after the second block.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ifcvt.c
^ permalink raw reply [flat|nested] 15+ messages in thread
* [Bug middle-end/59285] [4.9 Regression] gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862
2013-11-25 11:44 [Bug middle-end/59285] New: gcc.dg/builtin-unreachable-6.c:17:1: internal compiler error: in rtl_verify_fallthru, at cfgrtl.c:2862 ktkachov at gcc dot gnu.org
` (12 preceding siblings ...)
2014-01-08 5:56 ` law at gcc dot gnu.org
@ 2014-01-08 5:57 ` law at redhat dot com
13 siblings, 0 replies; 15+ messages in thread
From: law at redhat dot com @ 2014-01-08 5:57 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59285
Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #11 from Jeffrey A. Law <law at redhat dot com> ---
Resolved on the trunk by recent commit.
^ permalink raw reply [flat|nested] 15+ messages in thread
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2013-11-25 15:29 ` [Bug middle-end/59285] [4.9 Regression] " rguenth at gcc dot gnu.org
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