[llvm-bugs] [Bug 31107] New: wrong code with "opt -inline -instrprof -loop-extract"

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31107

            Bug ID: 31107
           Summary: wrong code with "opt -inline -instrprof -loop-extract"
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

$ clang -v
clang version 4.0.0 (trunk 287325)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/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
$
$ clang -c -w -emit-llvm -o small.bc small.c
$
$ llc -o small.s small.bc
$ gcc small.s
$ ./a.out
1
$
$ opt -inline -instrprof -loop-extract -o small-opt.bc small.bc
$ llc -o small-opt.s small-opt.bc
$ gcc small-opt.s
$ ./a.out
2
$


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


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

int a, c, e;

void fn1 ()
{ 
  int b[] = { 0, 2, 0, 0, 0, 0, 0 };
}

void fn2 ()
{ 
  int d[3] = { 0, 0, 0 }, e[7];
}

int fn3 ()
{ 
  int g[3];
  for (;;)
    { 
      int h[] = { 1, 1 };
      fn1 ();
      g;
      if (e < 1)
        return h[1];
    }
}

int main ()
{ 
  c = fn3 ();
  fn2 ();
  for (; a < 1; a++)
    printf ("%d\n", c);
  return 0;
}

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