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* [Bug tree-optimization/112809] New: during GIMPLE pass: bitintlower ICE: in limb_access_type, at gimple-lower-bitint.cc:563 at -O1 and above
@ 2023-12-01 11:05 zsojka at seznam dot cz
2023-12-04 19:42 ` [Bug tree-optimization/112809] " zsojka at seznam dot cz
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: zsojka at seznam dot cz @ 2023-12-01 11:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112809
Bug ID: 112809
Summary: during GIMPLE pass: bitintlower ICE: in
limb_access_type, at gimple-lower-bitint.cc:563 at -O1
and above
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
CC: jakub at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 56752
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56752&action=edit
reduced testcase
Compiler output:
$ x86_64-pc-linux-gnu-gcc -O testcase.c
during GIMPLE pass: bitintlower
testcase.c: In function 'foo':
testcase.c:6:1: internal compiler error: in limb_access_type, at
gimple-lower-bitint.cc:563
6 | foo (void)
| ^~~
0xd520e1 limb_access_type
/repo/gcc-trunk/gcc/gimple-lower-bitint.cc:563
0x2535e97 limb_access_type
/repo/gcc-trunk/gcc/gimple-lower-bitint.cc:559
0x2535e97 limb_access
/repo/gcc-trunk/gcc/gimple-lower-bitint.cc:578
0x2546609 lower_mergeable_stmt
/repo/gcc-trunk/gcc/gimple-lower-bitint.cc:2693
0x254af8d lower_stmt
/repo/gcc-trunk/gcc/gimple-lower-bitint.cc:5265
0x254d626 gimple_lower_bitint
/repo/gcc-trunk/gcc/gimple-lower-bitint.cc:6394
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r14-6051-20231201105652-gb1fe98dee21-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r14-6051-20231201105652-gb1fe98dee21-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20231201 (experimental) (GCC)
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/112809] during GIMPLE pass: bitintlower ICE: in limb_access_type, at gimple-lower-bitint.cc:563 at -O1 and above
2023-12-01 11:05 [Bug tree-optimization/112809] New: during GIMPLE pass: bitintlower ICE: in limb_access_type, at gimple-lower-bitint.cc:563 at -O1 and above zsojka at seznam dot cz
@ 2023-12-04 19:42 ` zsojka at seznam dot cz
2023-12-05 18:11 ` jakub at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: zsojka at seznam dot cz @ 2023-12-04 19:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112809
--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> ---
Created attachment 56791
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56791&action=edit
a simpler testcase using only two variables
$ x86_64-pc-linux-gnu-gcc -O testcase.c
during GIMPLE pass: bitintlower
testcase.c: In function 'foo':
testcase.c:5:1: internal compiler error: in limb_access_type, at
gimple-lower-bitint.cc:563
5 | foo (void)
| ^~~
0xd52c07 limb_access_type
/repo/gcc-trunk/gcc/gimple-lower-bitint.cc:563
0x25351a7 limb_access_type
/repo/gcc-trunk/gcc/gimple-lower-bitint.cc:559
0x25351a7 limb_access
/repo/gcc-trunk/gcc/gimple-lower-bitint.cc:578
0x2545989 lower_mergeable_stmt
/repo/gcc-trunk/gcc/gimple-lower-bitint.cc:2693
0x254a30d lower_stmt
/repo/gcc-trunk/gcc/gimple-lower-bitint.cc:5268
0x254c9a6 gimple_lower_bitint
/repo/gcc-trunk/gcc/gimple-lower-bitint.cc:6397
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/112809] during GIMPLE pass: bitintlower ICE: in limb_access_type, at gimple-lower-bitint.cc:563 at -O1 and above
2023-12-01 11:05 [Bug tree-optimization/112809] New: during GIMPLE pass: bitintlower ICE: in limb_access_type, at gimple-lower-bitint.cc:563 at -O1 and above zsojka at seznam dot cz
2023-12-04 19:42 ` [Bug tree-optimization/112809] " zsojka at seznam dot cz
@ 2023-12-05 18:11 ` jakub at gcc dot gnu.org
2023-12-06 8:56 ` cvs-commit at gcc dot gnu.org
2023-12-06 9:00 ` jakub at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: jakub at gcc dot gnu.org @ 2023-12-05 18:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112809
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
Last reconfirmed| |2023-12-05
Ever confirmed|0 |1
Status|UNCONFIRMED |ASSIGNED
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 56806
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56806&action=edit
gcc14-pr112809.patch
Untested fix.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/112809] during GIMPLE pass: bitintlower ICE: in limb_access_type, at gimple-lower-bitint.cc:563 at -O1 and above
2023-12-01 11:05 [Bug tree-optimization/112809] New: during GIMPLE pass: bitintlower ICE: in limb_access_type, at gimple-lower-bitint.cc:563 at -O1 and above zsojka at seznam dot cz
2023-12-04 19:42 ` [Bug tree-optimization/112809] " zsojka at seznam dot cz
2023-12-05 18:11 ` jakub at gcc dot gnu.org
@ 2023-12-06 8:56 ` cvs-commit at gcc dot gnu.org
2023-12-06 9:00 ` jakub at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2023-12-06 8:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112809
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:0ca64f846edce3c7b7f26bcc5978118e560e65b1
commit r14-6209-g0ca64f846edce3c7b7f26bcc5978118e560e65b1
Author: Jakub Jelinek <jakub@redhat.com>
Date: Wed Dec 6 09:55:30 2023 +0100
lower-bitint: Fix arithmetics followed by extension by many bits [PR112809]
A zero or sign extension from result of some upwards_2limb operation
is implemented in lower_mergeable_stmt as an extra loop which fills in
the extra bits with 0s or 1s.
If the delta of extended vs. unextended bit count is small, the code
doesn't use a loop and emits up to a couple of stores to constant indexes,
but if the delta is large, it uses
cnt = (bo_bit != 0) + 1 + (rem != 0);
statements. bo_bit is non-zero for bit-field loads and is done in that
case as straight line, the unconditional 1 in there is for a loop which
handles most of the limbs in the delta and finally (rem != 0) is for the
case when the extended precision is not a multiple of limb_prec and is
again done in straight line code (after the loop).
The testcase ICEs because the decision what idx to use was incorrect
for kind == bitint_prec_huge (i.e. when the precision delta is very large)
and rem == 0 (i.e. the extended precision is multiple of limb_prec).
In that case cnt is either 1 (if bo_bit == 0) or 2, and idx should
be either first size_int (start) and then result of create_loop (for bo_bit
!= 0) or just result of create_loop, but by mistake the last case
was size_int (end), which means when precision is multiple of limb_prec
storing above the precision (which ICEs; but also not emitting the loop
which is needed).
2023-12-06 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/112809
* gimple-lower-bitint.cc (bitint_large_huge::lower_mergeable_stmt):
For
separate_ext in kind == bitint_prec_huge mode if rem == 0, create
for
i == cnt - 1 the loop rather than using size_int (end).
* gcc.dg/bitint-48.c: New test.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/112809] during GIMPLE pass: bitintlower ICE: in limb_access_type, at gimple-lower-bitint.cc:563 at -O1 and above
2023-12-01 11:05 [Bug tree-optimization/112809] New: during GIMPLE pass: bitintlower ICE: in limb_access_type, at gimple-lower-bitint.cc:563 at -O1 and above zsojka at seznam dot cz
` (2 preceding siblings ...)
2023-12-06 8:56 ` cvs-commit at gcc dot gnu.org
@ 2023-12-06 9:00 ` jakub at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: jakub at gcc dot gnu.org @ 2023-12-06 9:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112809
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Should be fixed now.
^ permalink raw reply [flat|nested] 5+ messages in thread
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2023-12-01 11:05 [Bug tree-optimization/112809] New: during GIMPLE pass: bitintlower ICE: in limb_access_type, at gimple-lower-bitint.cc:563 at -O1 and above zsojka at seznam dot cz
2023-12-04 19:42 ` [Bug tree-optimization/112809] " zsojka at seznam dot cz
2023-12-05 18:11 ` jakub at gcc dot gnu.org
2023-12-06 8:56 ` cvs-commit at gcc dot gnu.org
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