[llvm-bugs] [Bug 34439] New: wrong code in Polly on x86_64-linux-gnu with "opt -newgvn -jump-threading -polly-mse -polly-opt-isl -polly-codegen"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34439

            Bug ID: 34439
           Summary: wrong code in Polly on x86_64-linux-gnu with "opt
                    -newgvn -jump-threading -polly-mse -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
3c2d979f2f63e55ba81da21814ab6451aa26c117) (http://llvm.org/git/llvm.git
d37603c94cc6fc100afbe5940f813f60e959dff4)
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 -O3 -mllvm -disable-llvm-optzns -c -emit-llvm -o small.bc small.c
$ optpolly -newgvn -jump-threading -polly-mse -polly-opt-isl -polly-codegen -o
small-opt.bc small.bc
$ clangpolly small-opt.bc
$ ./a.out
0
$
$ clangpolly -O0 small.c
$ ./a.out
15
$


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


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

int a, b;

int main ()
{ 
  int c, d = 0;
  for (; d < 16; d++)
    { 
      c = d;
      if (!d)
        c = c / 2;
      a = c;
      b = a;
    }
  printf ("%d\n", b);
  return 0;
}

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