[llvm-bugs] [Bug 42450] New: sroa makes function broken with "opt -slp-vectorizer -gvn -inline -scalarizer -sroa small.bc -o small-opt.bc"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42450

            Bug ID: 42450
           Summary: sroa makes function broken with "opt -slp-vectorizer
                    -gvn -inline -scalarizer -sroa  small.bc -o
                    small-opt.bc"
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: cszide at 163.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 22167
  --> https://bugs.llvm.org/attachment.cgi?id=22167&action=edit
.bc file of the source code

$clang -v
clang version 9.0.0 (trunk 363125)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64


$clang -O3 -c -emit-llvm -femit-all-decls -mllvm -disable-llvm-optzns small.c

$opt -slp-vectorizer -gvn -inline -scalarizer -sroa  small.bc -o small-opt.bc
PHI nodes not grouped at top of basic block!
  %p.2.i = phi i32 [ %p.2.i, %for.body18.i ], [ %p.2.i, %for.body21.i ]
label %for.cond19.i
in function j
LLVM ERROR: Broken function found, compilation aborted!

-----------------------------------------------
long a, b;
short c;
int d, e;
void(f)();
void(g)();
void(h)();
unsigned i();
void j() { i(); }
unsigned i() {
  short k = 0;
l:
  for (d = 4; d;)
    for (; k <= 1;) {
      k;
      f();
    }
  {
    unsigned m;
    if (b)
      goto l;
    0 > k;
    if (0 == 0)
      ;
    else {
      k;
      k &k;
    n:
      k;
      for (; 4; k)
        k;
      k;k;k;k;k;k;
    }
    for (; c;)
      for (; a;) {
        int o[50] = {8, 8, 8, 8};
        int p;
        g(k);
        for (; 0;) {
          p = k && p;
          k;
        }
      }
    h(k);
    if (e)
      return 0;
  }
  return 0;
}

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