[llvm-bugs] [Bug 34486] New: wrong code in Polly on x86_64-linux-gnu with "opt -sroa -functionattrs -loop-rotate -licm -loop-unswitch -loop-unroll -jump-threading -polly-opt-isl -polly-codegen"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34486

            Bug ID: 34486
           Summary: wrong code in Polly on x86_64-linux-gnu with "opt
                    -sroa -functionattrs -loop-rotate -licm -loop-unswitch
                    -loop-unroll -jump-threading -polly-opt-isl
                    -polly-codegen"
           Product: Polly
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Optimizer
          Assignee: polly-dev at googlegroups.com
          Reporter: su at cs.ucdavis.edu
                CC: llvm-bugs at lists.llvm.org

$ clangpolly -v
clang version 6.0.0 (http://llvm.org/git/clang.git
5a2b037a53684751a712b11898a0cc69815f2ba7) (http://llvm.org/git/llvm.git
76db91a4f033defd405dfb4d14ba6c0c7e205ce0)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/su/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.4
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
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/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.4
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
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.2.0
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
$ 
$ clangpolly -w -O3 -mllvm -disable-llvm-optzns -c -emit-llvm -o small.bc
small.c               
$ optpolly -sroa -functionattrs -loop-rotate -licm -loop-unswitch -loop-unroll
-jump-threading -polly-opt-isl -polly-codegen -o small-opt.bc small.bc
$ clangpolly small-opt.bc
$ ./a.out
0
$ 
$ clangpolly -O0 -w small.c; ./a.out
1
$ 


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


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

char fn1 (int e, int f) { return 0; }
int fn2 (int h) { return 0; }

int l, m, n, p, q, r[3][1], s, t, x, y, z, aa, ab;
unsigned o;

void fn3 ()
{
  unsigned ad;
L:;
  int af;
  for (ad = 0; ad < 1; ad++)
    {
      int ag;
      r[ad + 2][ad] || (fn1 (0, 5) && n);
      m = r[1][0] = 15 > p;
      if (!m)
        {
          if (q)
            goto L;
          y = fn1 (t, 0);
          z = fn2 (y);
          aa = fn1 (z, s);
          ab = fn2 (t);
          (af = fn1 (l, 2)) || (s = fn1 (ab, x) > 10);
        }
    }
  for (; o < 4; o++)
    af;
}

int main ()
{
  fn3 ();
  printf ("%d\n", m);
  return 0;
}

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