https://llvm.org/bugs/show_bug.cgi?id=30448
Bug ID: 30448 Summary: wrong code at -O3 on x86_64-linux-gnu (in both 32-bit and 64-bit modes) Product: clang Version: trunk Hardware: PC OS: All Status: NEW Severity: normal Priority: P Component: -New Bugs Assignee: unassignedclangb...@nondot.org Reporter: s...@cs.ucdavis.edu CC: llvm-bugs@lists.llvm.org Classification: Unclassified This is a regression from 3.8.x. $ clang -v clang version 4.0.0 (trunk 281848) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/local/clang-trunk/bin Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.4 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0 Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9 Candidate multilib: .;@m64 Candidate multilib: 32;@m32 Candidate multilib: x32;@mx32 Selected multilib: .;@m64 $ $ clang-3.8.1 -O3 small.c; ./a.out 0 $ clang -O2 small.c; ./a.out 0 $ $ clang -O3 small.c $ ./a.out 1 $ ---------------------------------------------------- int printf (const char *, ...); int a, c, d = 8, e, f, g, h, l, k, m, n, o, p, q; long b, r; volatile long i; long j[] = { 6069905 }; char fn1 (int p1, int p2) { return p1 >> p2; } int fn2 (int p1) { return p1; } static char fn3 (int p1, int p2) { if (a) L1: if (!g) goto L2; for (o = 0; o < 2; o++) for (; p; p++) ; for (b = 3; b < 9; b++) { q = (n && (e = p2)) || r; for (; d; d--) for (r = 2; r < 9; r++) { if (p2) break; fn1 (7, p2) && (j[r] = 1); } } for (; p1 < 2;) L2: for (; f; g++) ; p2 && i; for (;; k++) { char s; for (; o;) { char t = 1 << c; c = t; if (t) goto L1; printf ("%d\n", h); p2 = 1; return n; } } } int main () { m = fn2 (38); fn3 (7, m); return 0; } -- You are receiving this mail because: You are on the CC list for the bug.
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