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From: "shaohua.li at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/110582] New: Wrong code at -O2/3 on x86_64-linux-gnu Date: Fri, 07 Jul 2023 08:03:05 +0000 [thread overview] Message-ID: <bug-110582-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110582 Bug ID: 110582 Summary: Wrong code at -O2/3 on x86_64-linux-gnu Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: shaohua.li at inf dot ethz.ch Target Milestone: --- This seems to be a recent regression. gcc at -O2 and -O3 produce wrong code. Compiler explorer: https://godbolt.org/z/qWxPW34ch $ cat a.c int a, b; int main() { char c = a = 0; for (; c != -3; c++) { int d = 2; d ^= 2 && a; b = a == 0 ? d : d / a; a = b; } for (; (1 + 95 << 24) + b + 1 + 686658714L + b - 2297271457;) ; } $ $ gcc-tk -O0 a.c && ./a.out $ $ gcc-tk -O2 a.c $ $ ./a.out Killed $ $ gcc-tk -v Using built-in specs. COLLECT_GCC=gcc-tk COLLECT_LTO_WRAPPER=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-55900189ab517906efe08f8d17f3e4a310ee7fff/libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../configure --disable-multilib --disable-bootstrap --enable-languages=c,c++ --prefix=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-55900189ab517906efe08f8d17f3e4a310ee7fff Thread model: posix Supported LTO compression algorithms: zlib gcc version 14.0.0 20230707 (experimental) (GCC) $
next reply other threads:[~2023-07-07 8:03 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-07-07 8:03 shaohua.li at inf dot ethz.ch [this message] 2023-07-07 8:40 ` [Bug tree-optimization/110582] [14 Regression] " pinskia at gcc dot gnu.org 2023-07-07 11:19 ` rguenth at gcc dot gnu.org 2023-07-08 1:08 ` pinskia at gcc dot gnu.org 2023-07-08 1:17 ` pinskia at gcc dot gnu.org 2023-07-30 14:46 ` shaohua.li at inf dot ethz.ch 2023-07-31 16:06 ` cvs-commit at gcc dot gnu.org 2023-07-31 16:11 ` amacleod at redhat dot com
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