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* [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
@ 2022-01-11 3:58 hp at gcc dot gnu.org
2022-01-11 4:01 ` [Bug bootstrap/103974] " hp at gcc dot gnu.org
` (12 more replies)
0 siblings, 13 replies; 14+ messages in thread
From: hp at gcc dot gnu.org @ 2022-01-11 3:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
Bug ID: 103974
Summary: [12 Regression] ICE in ira_flattening building
libstdc++ with r12-6415-g01f3e6a40e72
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: build, ice-on-valid-code
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: hp at gcc dot gnu.org
CC: rsandifo at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-linux
Target: cris-elf
Commit r12-6415-g01f3e6a40e72, "[PATCH 27/33] ira: Consider modelling
caller-save allocations as loop spills" caused build to break for cris-elf,
when building the v10 multilib of libstdc++-v3, specifically
v10/libstdc++-v3/src/c++17 floating_to_chars.cc, like so:
libtool: compile: /tmp/X/gccobj/./gcc/xgcc -shared-libgcc
-B/tmp/X/gccobj/./gcc -nostdinc++ -L/tmp/X/gccobj/cris-elf/v10/libstdc++-v3/src
-L/tmp/X/gccobj/cris-elf/v10/libstdc++-v3/src/.libs
-L/tmp/X/gccobj/cris-elf/v10/libstdc++-v3/libsupc++/.libs -nostdinc
-B/tmp/X/gccobj/cris-elf/v10/newlib/ -isystem
/tmp/X/gccobj/cris-elf/v10/newlib/targ-include -isystem
/tmp/X/gcc/newlib/libc/include -B/tmp/X/gccobj/cris-elf/v10/libgloss/cris
-L/tmp/X/gccobj/cris-elf/v10/libgloss/libnosys -L/tmp/X/gcc/libgloss/cris
-B/tmp/X/pre/cris-elf/bin/ -B/tmp/X/pre/cris-elf/lib/ -isystem
/tmp/X/pre/cris-elf/include -isystem /tmp/X/pre/cris-elf/sys-include -march=v10
-mbest-lib-options -I/tmp/X/gcc/libstdc++-v3/../libgcc
-I/tmp/X/gccobj/cris-elf/v10/libstdc++-v3/include/cris-elf
-I/tmp/X/gccobj/cris-elf/v10/libstdc++-v3/include
-I/tmp/X/gcc/libstdc++-v3/libsupc++ -std=gnu++17 -nostdinc++
-fno-implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2
-fdiagnostics-show-location=once -ffunction-sections -fdata-sections
-frandom-seed=floating_to_chars.lo -fimplicit-templates -g -O2 -march=v10
-mbest-lib-options -c /tmp/X/gcc/libstdc++-v3/src/c++17/floating_to_chars.cc -o
floating_to_chars.o
/tmp/X/gcc/libstdc++-v3/src/c++17/floating_to_chars.cc:561:3: warning:
'std::to_chars_result {anonymous}::to_chars(char*, char*, uint128_t)' defined
but not used [-Wunused-function]
561 | to_chars(char* first, char* const last, uint128_t x)
| ^~~~~~~~
/tmp/X/gcc/libstdc++-v3/src/c++17/floating_to_chars.cc:554:3: warning: 'int
{anonymous}::get_mantissa_length(ryu::generic128::floating_decimal_128)'
defined but not used [-Wunused-function]
554 | get_mantissa_length(const ryu::floating_decimal_128 fd)
| ^~~~~~~~~~~~~~~~~~~
/tmp/X/gcc/libstdc++-v3/src/c++17/floating_to_chars.cc:127:5: warning: 'int
{anonymous}::ryu::to_chars(generic128::floating_decimal_128, char*)' defined
but not used [-Wunused-function]
127 | to_chars(const floating_decimal_128 v, char* const result)
| ^~~~~~~~
during RTL pass: ira
/tmp/X/gcc/libstdc++-v3/src/c++17/floating_to_chars.cc: In function
'std::to_chars_result std::__floating_to_chars_shortest(char*, char*, T,
chars_format) [with T = double]':
/tmp/X/gcc/libstdc++-v3/src/c++17/floating_to_chars.cc:1106:3: internal
compiler error: in ira_flattening, at ira-build.c:3213
1106 | }
| ^
0x708412 ira_flattening(int, int)
/tmp/X/gcc/gcc/ira-build.c:3213
0xe7c9b8 ira
/tmp/X/gcc/gcc/ira.c:5807
0xe7c9b8 execute
/tmp/X/gcc/gcc/ira.c:6075
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
I'll attach a brief gdb inspection session.
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
@ 2022-01-11 4:01 ` hp at gcc dot gnu.org
2022-01-11 4:08 ` hp at gcc dot gnu.org
` (11 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: hp at gcc dot gnu.org @ 2022-01-11 4:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
--- Comment #1 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
Created attachment 52157
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52157&action=edit
gzipped preprocessed (>1 MB) floating_to_chars.ii
Reproduce using the ungzipped file for example like so:
/tmp/X/gccobj/./gcc/cc1plus -fpreprocessed floating_to_chars.ii -march=v10
-quiet -dumpbase floating_to_chars.cc -dumpbase-ext .cc -O2 -std=gnu++17
-frandom-seed=floating_to_chars.lo
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
2022-01-11 4:01 ` [Bug bootstrap/103974] " hp at gcc dot gnu.org
@ 2022-01-11 4:08 ` hp at gcc dot gnu.org
2022-01-11 4:21 ` pinskia at gcc dot gnu.org
` (10 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: hp at gcc dot gnu.org @ 2022-01-11 4:08 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
--- Comment #2 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
Created attachment 52158
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52158&action=edit
brief gdb inspection session
I had to "rm *ira*.o" and "make all-gcc CXXFLAGS=-g3" and re-start the gdb
session to get a sane inspection context: that's what the "r;
`/tmp/X/gccobj/gcc/cc1plus' has changed; re-reading symbols." is about. IOW,
business as usual.
BTW, host environment is Debian 11; "gcc --version | head -1" yields
gcc (Debian 10.2.1-6) 10.2.1 20210110
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
2022-01-11 4:01 ` [Bug bootstrap/103974] " hp at gcc dot gnu.org
2022-01-11 4:08 ` hp at gcc dot gnu.org
@ 2022-01-11 4:21 ` pinskia at gcc dot gnu.org
2022-01-11 4:36 ` pinskia at gcc dot gnu.org
` (9 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-01-11 4:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |12.0
CC| |pinskia at gcc dot gnu.org
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
` (2 preceding siblings ...)
2022-01-11 4:21 ` pinskia at gcc dot gnu.org
@ 2022-01-11 4:36 ` pinskia at gcc dot gnu.org
2022-01-11 7:22 ` pinskia at gcc dot gnu.org
` (8 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-01-11 4:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2022-01-11
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, reducing.
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
` (3 preceding siblings ...)
2022-01-11 4:36 ` pinskia at gcc dot gnu.org
@ 2022-01-11 7:22 ` pinskia at gcc dot gnu.org
2022-01-11 7:34 ` pinskia at gcc dot gnu.org
` (7 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-01-11 7:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 52159
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52159&action=edit
reduced testcase as much as I could get it
Just needs -O2. It is both a C or C++ testcase even.
I can't reduce it any further really.
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
` (4 preceding siblings ...)
2022-01-11 7:22 ` pinskia at gcc dot gnu.org
@ 2022-01-11 7:34 ` pinskia at gcc dot gnu.org
2022-01-11 8:53 ` rguenth at gcc dot gnu.org
` (6 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-01-11 7:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This the steps I needed to reproduce this bug;
mkdir objdir-cris
cd objdir-cris
../configure --target=cris-elf
make -j24 all-gcc
cd gcc
wget https://gcc.gnu.org/bugzilla/attachment.cgi?id=52159
mv attach* t.c
./cc1 t.c -O2
(you can do at this point:
make clean
make -j24 cc1
and get a -O0 built cc1 too if needed).
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
` (5 preceding siblings ...)
2022-01-11 7:34 ` pinskia at gcc dot gnu.org
@ 2022-01-11 8:53 ` rguenth at gcc dot gnu.org
2022-01-11 14:00 ` law at gcc dot gnu.org
` (5 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-01-11 8:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
` (6 preceding siblings ...)
2022-01-11 8:53 ` rguenth at gcc dot gnu.org
@ 2022-01-11 14:00 ` law at gcc dot gnu.org
2022-01-11 14:07 ` rsandifo at gcc dot gnu.org
` (4 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: law at gcc dot gnu.org @ 2022-01-11 14:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
Jeffrey A. Law <law at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |law at gcc dot gnu.org
--- Comment #6 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Richard -- if you need an alternate testcase, reach out -- I've seen what is
likely the same failure on lm32-elf building libgcc. I have the un-reduced .i
if it'd be useful.
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
` (7 preceding siblings ...)
2022-01-11 14:00 ` law at gcc dot gnu.org
@ 2022-01-11 14:07 ` rsandifo at gcc dot gnu.org
2022-01-11 14:29 ` law at gcc dot gnu.org
` (3 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: rsandifo at gcc dot gnu.org @ 2022-01-11 14:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |rsandifo at gcc dot gnu.org
Status|NEW |ASSIGNED
--- Comment #7 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
(In reply to Jeffrey A. Law from comment #6)
> Richard -- if you need an alternate testcase, reach out -- I've seen what is
> likely the same failure on lm32-elf building libgcc. I have the un-reduced
> .i if it'd be useful.
It's OK, thanks. It's a simple “don't do this for old reload”
thing, but first I needed a few attempts to get a full testsuite
run for cris-elf, and then I changed my mind about where exactly
the shortcut should go. Hope to post a patch later today.
Re one of the things I hit getting the cris-elf testsuite run:
it would be good to make the port rtl-checking clean if possible.
At the moment, building with --enable-checking=yes,extra,rtl
(my usual flags) falls over on cris.c:395:
insn = as_a <rtx_insn *> XVECEXP (pat, 0, 1);
(missing parens).
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
` (8 preceding siblings ...)
2022-01-11 14:07 ` rsandifo at gcc dot gnu.org
@ 2022-01-11 14:29 ` law at gcc dot gnu.org
2022-01-11 19:25 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
12 siblings, 0 replies; 14+ messages in thread
From: law at gcc dot gnu.org @ 2022-01-11 14:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
--- Comment #8 from Jeffrey A. Law <law at gcc dot gnu.org> ---
ACK. I wandered through the tester this morning, the vast majority of the
current failures are the ira_flattening ICE. Though I think there's likely one
other ICE in IRA (frv-elf, ICE in check_allocation).
I'll restart everything once you've got your patch ready and file fresh bugs
for anything that's still problematical after the ira_flattening ICE is
resolved.
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
` (9 preceding siblings ...)
2022-01-11 14:29 ` law at gcc dot gnu.org
@ 2022-01-11 19:25 ` cvs-commit at gcc dot gnu.org
2022-01-11 19:25 ` rsandifo at gcc dot gnu.org
2022-01-18 12:09 ` hp at gcc dot gnu.org
12 siblings, 0 replies; 14+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2022-01-11 19:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Sandiford <rsandifo@gcc.gnu.org>:
https://gcc.gnu.org/g:db8d94a0570dc1f3de10c9eb9fe6e91df804272b
commit r12-6490-gdb8d94a0570dc1f3de10c9eb9fe6e91df804272b
Author: Richard Sandiford <richard.sandiford@arm.com>
Date: Tue Jan 11 19:24:59 2022 +0000
ira: Fix old-reload targets [PR103974]
The new IRA heuristics would need more work on old-reload targets,
since flattening needs to be able to undo the cost propagation.
It's doable, but hardly seems worth it.
This patch therefore makes all the new calls to
ira_subloop_allocnos_can_differ_p return false if !ira_use_lra_p.
The color_pass code that predated the new function (and that was
the source of ira_subloop_allocnos_can_differ_p) continues to
behave as before.
It's a hack, but at least it has the advantage that the new parameter
would become obviously unused if reload and (!)ira_use_lra_p were
removed. The hack should therefore disappear alongside reload.
gcc/
PR rtl-optimization/103974
* ira-int.h (ira_subloop_allocnos_can_differ_p): Take an
extra argument, default true, that says whether old-reload
targets should be excluded.
* ira-color.c (color_pass): Pass false.
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
` (10 preceding siblings ...)
2022-01-11 19:25 ` cvs-commit at gcc dot gnu.org
@ 2022-01-11 19:25 ` rsandifo at gcc dot gnu.org
2022-01-18 12:09 ` hp at gcc dot gnu.org
12 siblings, 0 replies; 14+ messages in thread
From: rsandifo at gcc dot gnu.org @ 2022-01-11 19:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #10 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 14+ messages in thread
* [Bug bootstrap/103974] [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72
2022-01-11 3:58 [Bug bootstrap/103974] New: [12 Regression] ICE in ira_flattening building libstdc++ with r12-6415-g01f3e6a40e72 hp at gcc dot gnu.org
` (11 preceding siblings ...)
2022-01-11 19:25 ` rsandifo at gcc dot gnu.org
@ 2022-01-18 12:09 ` hp at gcc dot gnu.org
12 siblings, 0 replies; 14+ messages in thread
From: hp at gcc dot gnu.org @ 2022-01-18 12:09 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103974
--- Comment #11 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
Yes, thanks for the quick resolution.
^ permalink raw reply [flat|nested] 14+ messages in thread
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