[llvm-bugs] [Bug 34431] New: wrong code in Polly on x86_64-linux-gnu with "opt -gvn -polly-opt-isl -polly-codegen"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34431

            Bug ID: 34431
           Summary: wrong code in Polly on x86_64-linux-gnu with "opt -gvn
                    -polly-opt-isl -polly-codegen"
           Product: Polly
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          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
48231c128c697271508e83b487d436a071e62f09) (http://llvm.org/git/llvm.git
aedd47f9e210dc3ce82a1f885043d7d005b52dd7)
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 -O0 small.c; ./a.out
$ 
$ clangpolly -O3 -mllvm -polly small.c; ./a.out
$ 
$ clangpolly -O3 -mllvm -disable-llvm-optzns -c -emit-llvm -o small.bc small.c
$ optpolly -gvn -polly-opt-isl -polly-codegen -o small-opt.bc small.bc
$ clangpolly small-opt.bc
$ ./a.out
1
$ 


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



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

int a, b, c, d;

int main ()
{
  {
    int f;
    for (; b < 1; b++)
      {
        int g;
        for (a = 0; a < 1;)
          return c; 
      }
  }
  d = 1;
  printf ("%d\n", d);
  return 0; 
}

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