[llvm-bugs] [Bug 37825] New: wrong code with "opt -loop-rotate -licm -indvars -loop-vectorize -gvn"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37825

            Bug ID: 37825
           Summary: wrong code with "opt -loop-rotate -licm -indvars
                    -loop-vectorize -gvn"
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: llvm-bugs at lists.llvm.org

Created attachment 20435
  --> https://bugs.llvm.org/attachment.cgi?id=20435&action=edit
LLVM IR triggering the wrong code

Tested with trunk revision 334906. 


$ clangpolly -v
clang version 7.0.0 (http://llvm.org/git/clang.git
c36069cffc57a30a20782bf327a87bed4e48a6c2) (http://llvm.org/git/llvm.git
59cb663e72874dda740aa2b18bf47ba65b32fe9b)
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 -O0 small.c; ./a.out
$ 
$ clangpolly -O3 -mllvm -disable-llvm-optzns -c -emit-llvm -o small.bc small.c
$ optpolly -loop-rotate -licm -indvars -loop-vectorize -gvn -o small-opt.bc
small.bc
$ clangpolly small-opt.bc
$ ./a.out
Segmentation fault (core dumped)
$ 


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


int a[9][2], *b[10], **c = &b[5], d;

int main ()
{
  for (; d < 4; d++)
    b[d + 5] = &a[d + 2][1];
  **c = 0;
  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/20180617/b89c5018/attachment.html>