[llvm-bugs] [Bug 34640] New: wrong code in Polly on x86_64-linux-gnu with "opt -simplifycfg -early-cse-memssa -loop-rotate -loop-unroll -licm -instcombine -polly-simplify -polly-opt-isl -polly-codegen"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34640

            Bug ID: 34640
           Summary: wrong code in Polly on x86_64-linux-gnu with "opt
                    -simplifycfg -early-cse-memssa -loop-rotate
                    -loop-unroll -licm -instcombine -polly-simplify
                    -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

Tested with trunk revision 313398. 

$ clangpolly -v
clang version 6.0.0 (http://llvm.org/git/clang.git
f5779ed24ea68e59509ac648aac13c197170ab4d)
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 -O3 -mllvm -disable-llvm-optzns -c -emit-llvm -o small.bc small.c
$ optpolly -simplifycfg -early-cse-memssa -loop-rotate -loop-unroll -licm
-instcombine -polly-simplify -polly-opt-isl -polly-codegen -o small-opt.bc
small.bc
$ clangpolly small-opt.bc
$ ./a.out
0
$ 
$ clangpolly -O0 small.c; ./a.out
13
$ 


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


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

int a, b, c, e, f, g, h;

int main () 
{
  for (; e < 1; e++)
    {
      for (f = 0; f < 13; f++)
        h = b ? a % b : 0;
      if (a)
        c |= g;
    }
  printf("%d\n", f);
  return 0; 
}

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