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* [Bug tree-optimization/103380] New: [12 Regression] wrong code with -Os -fwrapv
@ 2021-11-23 12:19 zsojka at seznam dot cz
2021-11-23 13:13 ` [Bug tree-optimization/103380] " rguenth at gcc dot gnu.org
2021-11-23 13:17 ` jakub at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: zsojka at seznam dot cz @ 2021-11-23 12:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103380
Bug ID: 103380
Summary: [12 Regression] wrong code with -Os -fwrapv
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Created attachment 51859
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51859&action=edit
reduced testcase
Output:
$ x86_64-pc-linux-gnu-gcc -Os -fwrapv testcase.c
$ ./a.out
Aborted
The value of 'x' is 1 instead of 2.
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r12-5468-20211123110434-g6cd44067007-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.0/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-r12-5468-20211123110434-g6cd44067007-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20211123 (experimental) (GCC)
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/103380] [12 Regression] wrong code with -Os -fwrapv
2021-11-23 12:19 [Bug tree-optimization/103380] New: [12 Regression] wrong code with -Os -fwrapv zsojka at seznam dot cz
@ 2021-11-23 13:13 ` rguenth at gcc dot gnu.org
2021-11-23 13:17 ` jakub at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-11-23 13:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103380
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2021-11-23
Status|UNCONFIRMED |NEW
Priority|P3 |P1
Ever confirmed|0 |1
Target Milestone|--- |12.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. Breaks in bswap.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/103380] [12 Regression] wrong code with -Os -fwrapv
2021-11-23 12:19 [Bug tree-optimization/103380] New: [12 Regression] wrong code with -Os -fwrapv zsojka at seznam dot cz
2021-11-23 13:13 ` [Bug tree-optimization/103380] " rguenth at gcc dot gnu.org
@ 2021-11-23 13:17 ` jakub at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-11-23 13:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103380
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
CC| |jakub at gcc dot gnu.org
Status|NEW |RESOLVED
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Dup.
*** This bug has been marked as a duplicate of bug 103376 ***
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-11-23 12:19 [Bug tree-optimization/103380] New: [12 Regression] wrong code with -Os -fwrapv zsojka at seznam dot cz
2021-11-23 13:13 ` [Bug tree-optimization/103380] " rguenth at gcc dot gnu.org
2021-11-23 13:17 ` jakub at gcc dot gnu.org
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