[llvm-bugs] [Bug 39059] New: wrong code at -O3 on x86_64-linux-gnu (generated code hangs)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39059

            Bug ID: 39059
           Summary: wrong code at -O3 on x86_64-linux-gnu (generated code
                    hangs)
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: llvm-bugs at lists.llvm.org

Tested with trunk revision 342871. 

$ clangpolly -v
clang version 8.0.0 (http://llvm.org/git/clang.git
4eca03e7d21186125ac4503bd7579bbb10a36961) (http://llvm.org/git/llvm.git
2948bf4bf86331542d2829f9164d54f4fb267e3d)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/su/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6.0.0
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/4.7.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
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/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ 
$ clangpolly -O2 small.c
$ ./a.out
$ 
$ clangpolly -O3 small.c
$ timeout -s 9 5 ./a.out
Killed
$ 


----------------------------------


int printf (const char *, ...);

struct
{
  int a;
} *b;

int c, d = 1, e, f;

int main ()
{
  int g = 1, h = 1, i = 129, j = 1;
L1:;
  int l = i;
  i = d;
L2:
  if (c)
    while (b->a)
      h = 2;
  if (d < 0)
    {
      printf ("%d\n", i);
      f = j >> l || e << e;
    }
  if (!i)
    j = 0;
  int n = g;
  g = 0;
  if (h > 2)
    goto L2;
  if (!n)
    goto L1;
  return 0;
}

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20180924/3cae5366/attachment.html>