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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/112282] New: wrong code (generated code hangs) at -O3 on x86_64-linux-gnu Date: Sun, 29 Oct 2023 22:39:18 +0000 [thread overview] Message-ID: <bug-112282-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112282 Bug ID: 112282 Summary: wrong code (generated code hangs) at -O3 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: --- The code is very tough to reduce, but it appears to be a recent regression. Although the reduced code is still quite hairy, it does seem valid. Compiler Explorer: https://godbolt.org/z/TxGdP87EW [621] % 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/14.0.0/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 Thread model: posix Supported LTO compression algorithms: zlib gcc version 14.0.0 20231029 (experimental) (GCC) [622] % [622] % gcctk -O2 small.c; ./a.out [623] % [623] % gcctk -O3 small.c [624] % timeout -s 9 10 ./a.out Killed [625] % cat small.c int printf(const char *, ...); void __assert_fail(); int a, g, h, i, v, w = 2, x, y, ab, ac, ad, ae, af, ag; static int f, j, m, n, p, r, u, aa; struct b { int c : 20; int d : 20; int e : 10; }; static struct b l, o, q = {3, 3, 5}; int s(int z) { struct b ah; int ai = 1, aj[7] = {1, 1, 1, 1, 1, 1, 1}; ak: for (u = -22; u < 2; ++u) { struct b al[8] = {{2, 7, 9}, {8, 7, 1}, {2, 7, 9}, {8, 7, 1}, {2, 7, 9}, {8, 7, 1}, {2, 7, 9}}; y = z = 0; for (; z < 2; z++) { int am[18], k; ab = ac = 0; for (; ac < 1; ac++) for (k = 0; k < 9; k++) am[k] = 0; n = 0; while (1) { v = u < 0 || a; h = z < ~u && 4 & q.c; if ((aa <= l.c) > q.d && p) return o.c; if (w) break; return q.e; } a = j; } } for (x = 0; x < 2; x++) { struct b an = {1, 8, 4}; int ao[28] = {5, 0, 0, 9, 0, 3, 0, 5, 0, 0, 9, 0, 3, 0, 5, 0, 0, 9, 0, 3, 0, 5, 0, 0, 9, 0, 3, 0}; if (q.e) { int ap = ai || l.c + q.c, aq = q.d, ar = p & f; q.d = q.d || ar || ap; p = 0; if (!j && ai) goto as; if (q.d) { printf("", l); q.d = f >> j; } p = l.c = aq; an = q; } else { int at[12][1] = {{9}, {9}, {5}, {9}, {9}, {5}, {9}, {9}, {5}, {9}, {9}, {5}}; struct b au; if (o.c) aa = ah.e; if (an.d) ah.e = (j & (aa * m)) ^ au.d; o.c = m + aa; int av = o.c || 0, aw = ai || q.c & l.c, ax = n; if (q.e < ai) q = an; if (r) break; ai = aw - av; an.e = 0; if (ai) { an.e = l.c || 0; f = q.c; ah.e = l.c % q.d; q.c = au.e; if ((q.d && q.c) || ah.e) __assert_fail(); q.c = 0; if (au.d > m || ah.e) w = au.c | (n & ah.c); as: ae = af = ah.c; int ay = au.d & q.e & au.c || o.c, az = 0 || o.c, ba = m & ah.d; if (n) au.c = au.e = (q.e || ah.d) ^ (o.c + (az / au.e)); n = au.c || au.e; if (ba) { printf("", ax); x = q.e | m; continue; } m = ay; n = printf("", au); } if (ah.d) o.c = l.c & o.c & q.c; if (q.d) __assert_fail(); printf("", an); printf("", q); printf("", au); if (ah.e) while (u++) { struct b al[7] = {{7, 9, 8}, {7, 1, 2}, {7, 9, 8}, {7, 1, 2}, {7, 9, 8}, {7, 1, 2}, {7, 9, 0}}; if (an.d) { int d[8] = {0, 1, 0, 1, 0, 1, 0, 1}; if (ad) goto ak; while (ag) g = an.d = i = m; f = j; } n++; } f = q.d; } if (l.c && m) { int d[7] = {1, 0, 1, 0, 1, 0, 1}; if (x) h = an.d; else g = 0; } } int bb = (q.d ^ ah.c) | aa | (q.e & q.c) | (f & ah.d); if (bb) return x; return 0; } int main() { j = 1; s(0); return 0; }
next reply other threads:[~2023-10-29 22:39 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-10-29 22:39 zhendong.su at inf dot ethz.ch [this message] 2023-10-29 22:41 ` [Bug tree-optimization/112282] [14 Regression] " pinskia at gcc dot gnu.org 2023-10-29 22:51 ` pinskia at gcc dot gnu.org 2023-10-30 0:40 ` sjames at gcc dot gnu.org 2023-10-30 0:41 ` sjames at gcc dot gnu.org 2023-10-30 1:28 ` sjames at gcc dot gnu.org 2023-10-30 1:48 ` pinskia at gcc dot gnu.org 2023-10-30 1:53 ` pinskia at gcc dot gnu.org 2023-10-30 3:49 ` [Bug tree-optimization/112282] [14 Regression] wrong code (generated code hangs) at -O3 on x86_64-linux-gnu since r14-4777-g88c27070c25309 sjames at gcc dot gnu.org 2023-10-30 9:13 ` tnfchris at gcc dot gnu.org 2023-10-30 14:21 ` rguenth at gcc dot gnu.org 2023-10-30 20:21 ` avieira at gcc dot gnu.org 2023-10-31 9:12 ` avieira at gcc dot gnu.org 2023-10-31 9:12 ` avieira at gcc dot gnu.org 2023-11-14 14:48 ` rguenth at gcc dot gnu.org 2023-11-15 10:36 ` rguenth at gcc dot gnu.org 2023-11-15 10:56 ` rguenth at gcc dot gnu.org 2023-11-15 12:12 ` cvs-commit at gcc dot gnu.org 2023-11-15 12:12 ` rguenth at gcc dot gnu.org 2023-11-16 7:05 ` cvs-commit at gcc dot gnu.org
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