[llvm-bugs] [Bug 41557] New: wrong code with "opt -structurizecfg -newgvn"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41557

            Bug ID: 41557
           Summary: wrong code with "opt -structurizecfg -newgvn"
           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 21808
  --> https://bugs.llvm.org/attachment.cgi?id=21808&action=edit
.bc file of the source code

$clang -v
clang version 9.0.0 (trunk 355281)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/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/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64

$clang -O3 -c -emit-llvm  -mllvm -disable-llvm-optzns small.c -o small.bc

$clang small.bc -o small1.out && ./small1.out
65535
0
0
0
0
0
0
0
0

$opt -sroa -simple-loop-unswitch -gvn small.bc -o small-opt1.bc
$clang small-opt1.bc -o small2.out && ./small2.out
65535
0
0
0
0
0
0
0
0

$opt -structurizecfg -newgvn   small-opt1.bc -o small-opt2.bc
$clang small-opt2.bc -o small3.out && ./small3.out
1792
0
0
0
0
0
0
0
0

$opt -structurizecfg   small-opt1.bc -o small-opt3.bc
$clang small-opt3.bc -o small4.out && ./small4.out
Segmentation fault (core dumped)

-------------------------------------
#include<stdio.h>

unsigned int a, d;
unsigned short int b[1][9];
unsigned short int *c = b;
int **e;
int *f();
unsigned char g() {
  f(0, 0);
  return 0;
}
int *f(h, m) {
k:
  if (m < *c)
    for (; d;) {
      *e = &m;
      for (; a;)
        goto k;
    }
  --*c;
  return 0;
}
void main() {
  int i, j, l = 0;
  g();
  for (i = j = 0; j < 9; j++){
     printf("%d\n",b[i][j]);
  }

}

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