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From: "zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/107269] New: wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu Date: Fri, 14 Oct 2022 18:22:20 +0000 [thread overview] Message-ID: <bug-107269-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107269 Bug ID: 107269 Summary: wrong code at -O1 and above with "-fno-tree-ccp" on x86_64-linux-gnu Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: zhendong.su at inf dot ethz.ch Target Milestone: --- It appears to be a recent regression. Compiler Explorer: https://godbolt.org/z/WdcsavxTh [593] % gcctk -v Using built-in specs. COLLECT_GCC=gcctk COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --disable-bootstrap --enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk --enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib --with-system-zlib Thread model: posix Supported LTO compression algorithms: zlib gcc version 13.0.0 20221014 (experimental) [master r13-3307-g8efc38347a7] (GCC) [594] % [594] % gcctk -O1 small.c; ./a.out [595] % [595] % gcctk -O1 -fno-tree-ccp small.c [596] % ./a.out Floating point exception [597] % [597] % cat small.c int a, b, f; char c = 3; unsigned d = 1; short e; int main() { int h = 2357999721; char i = a = 3; for (; a >= 0; a--) { int *j = &h; char k = i || c; short l = ~h; b = ~(d % h); f = ~i / b; if (h >= -1936967575) { int m = h / d / 110000000 ^ (f & c); short n = c; if (h <= -1936967575) n = e; h = m; c = ~(n + f); d = -1; } i = ~l - k; } return 0; }
next reply other threads:[~2022-10-14 18:22 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-10-14 18:22 zhendong.su at inf dot ethz.ch [this message] 2022-10-14 18:29 ` [Bug tree-optimization/107269] " zhendong.su at inf dot ethz.ch 2022-10-15 20:45 ` zhendong.su at inf dot ethz.ch 2022-10-17 3:26 ` crazylht at gmail dot com 2022-10-17 7:48 ` rguenth at gcc dot gnu.org 2022-10-17 19:07 ` hjl.tools at gmail dot com 2022-10-18 3:31 ` crazylht at gmail dot com
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