[llvm-bugs] [Bug 41702] New: wrong code with "opt -structurizecfg -reg2mem -newgvn -inline -jump-threading"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41702

            Bug ID: 41702
           Summary: wrong code with "opt -structurizecfg -reg2mem -newgvn
                    -inline -jump-threading"
           Product: libraries
           Version: 8.0
          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 21870
  --> https://bugs.llvm.org/attachment.cgi?id=21870&action=edit
.bc file of the source code

$clang -v
clang version 8.0.0 (tags/RELEASE_800/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir:
/home/jack-zhou/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-18.04/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  -mllvm -disable-llvm-optzns small.c -o small.bc

$ clang small.bc -o small1.out && ./small1.out
1
0
0
0

$opt -structurizecfg -reg2mem -newgvn -inline -jump-threading small.bc -o
small-opt.bc

$clang small-opt.bc -o small2.out && ./small2.out
0
0
0
0

-------------------------------------------------
#include <stdio.h>
typedef signed char int8_t;
typedef short int int16_t;
typedef int int32_t;
typedef long int int64_t;

/* Unsigned.  */
typedef unsigned char uint8_t;
typedef unsigned short int uint16_t;
typedef unsigned int uint32_t;
typedef unsigned long int uint64_t;

static uint32_t
(safe_sub_func_uint32_t_u_u)(uint32_t ui1, uint32_t ui2 )
{

  return ui1 - ui2;
}

int16_t b, g, f, e = 1, d, c;
uint64_t h[1][4];
int8_t k(int16_t, int8_t);
const uint32_t l();
int8_t m() {
  k(b, 0);
  return 0;
}
int8_t k(int16_t n, int8_t o) {
  uint64_t *ab = &h[0][0];
  *ab = safe_sub_func_uint32_t_u_u(l(), 0);
  return g;
}
const uint32_t l() {
  for (; 0;)
  ak:
    for (; c;) {
      int32_t a;
      for (; 0;)
        return d;
    }
  for (; f;)
    goto ak;
  return e;
}
void main() {
  int i, j, am = 0;
  m();
  i = 0;
  for (j = 0; j < 4; j++)
    printf("%lu\n",h[i][j]);
}

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