user: Please show me the C implementation that matches the assembly code listed below:

```asm
<test_xchg>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  add    $0xffffffffffffff80,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x12345678,-0x74(%rbp)
  movl   $0xfbca7654,-0x70(%rbp)
  mov    -0x74(%rbp),%edx
  mov    -0x70(%rbp),%eax
  xchg   %eax,%edx
  mov    %edx,-0x74(%rbp)
  mov    %eax,-0x70(%rbp)
  mov    -0x70(%rbp),%edx
  mov    -0x74(%rbp),%eax
  mov    %edx,%ecx
  mov    %eax,%edx
  lea    D283(%rip),%rax
  mov    %rax,%rsi
  lea    D201(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x6c(%rbp)
  movl   $0xfbca7654,-0x68(%rbp)
  mov    -0x6c(%rbp),%edx
  mov    -0x68(%rbp),%eax
  xchg   %ax,%dx
  mov    %edx,-0x6c(%rbp)
  mov    %eax,-0x68(%rbp)
  mov    -0x68(%rbp),%edx
  mov    -0x6c(%rbp),%eax
  mov    %edx,%ecx
  mov    %eax,%edx
  lea    D234(%rip),%rax
  mov    %rax,%rsi
  lea    D201(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x64(%rbp)
  movl   $0xfbca7654,-0x60(%rbp)
  mov    -0x64(%rbp),%edx
  mov    -0x60(%rbp),%eax
  xchg   %dl,%al
  mov    %edx,-0x64(%rbp)
  mov    %eax,-0x60(%rbp)
  mov    -0x60(%rbp),%edx
  mov    -0x64(%rbp),%eax
  mov    %edx,%ecx
  mov    %eax,%edx
  lea    D208(%rip),%rax
  mov    %rax,%rsi
  lea    D201(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x5c(%rbp)
  movl   $0xfbca7654,-0x78(%rbp)
  mov    -0x5c(%rbp),%eax
  xchg   %eax,-0x78(%rbp)
  mov    %eax,-0x5c(%rbp)
  mov    -0x78(%rbp),%edx
  mov    -0x5c(%rbp),%eax
  mov    %edx,%ecx
  mov    %eax,%edx
  lea    D283(%rip),%rax
  mov    %rax,%rsi
  lea    D201(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x58(%rbp)
  movl   $0xfbca7654,-0x78(%rbp)
  mov    -0x58(%rbp),%eax
  xchg   %ax,-0x78(%rbp)
  mov    %eax,-0x58(%rbp)
  mov    -0x78(%rbp),%edx
  mov    -0x58(%rbp),%eax
  mov    %edx,%ecx
  mov    %eax,%edx
  lea    D234(%rip),%rax
  mov    %rax,%rsi
  lea    D201(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x54(%rbp)
  movl   $0xfbca7654,-0x78(%rbp)
  mov    -0x54(%rbp),%eax
  xchg   %al,-0x78(%rbp)
  mov    %eax,-0x54(%rbp)
  mov    -0x78(%rbp),%edx
  mov    -0x54(%rbp),%eax
  mov    %edx,%ecx
  mov    %eax,%edx
  lea    D208(%rip),%rax
  mov    %rax,%rsi
  lea    D201(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x50(%rbp)
  movl   $0xfbca7654,-0x4c(%rbp)
  mov    -0x50(%rbp),%edx
  mov    -0x4c(%rbp),%eax
  mov    $0xfbca7654,%esi
  mov    %edx,%ecx
  mov    %eax,%edx
  mov    %esi,%eax
  cmpxchg %ecx,%edx
  mov    %ecx,-0x50(%rbp)
  mov    %edx,-0x4c(%rbp)
  mov    -0x4c(%rbp),%edx
  mov    -0x50(%rbp),%eax
  mov    %edx,%r8d
  mov    %eax,%ecx
  mov    $0xfbca7654,%edx
  lea    D41(%rip),%rax
  mov    %rax,%rsi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x48(%rbp)
  movl   $0xfbca7654,-0x44(%rbp)
  mov    -0x48(%rbp),%edx
  mov    -0x44(%rbp),%eax
  mov    $0xfbca7654,%esi
  mov    %edx,%ecx
  mov    %eax,%edx
  mov    %esi,%eax
  cmpxchg %cx,%dx
  mov    %ecx,-0x48(%rbp)
  mov    %edx,-0x44(%rbp)
  mov    -0x44(%rbp),%edx
  mov    -0x48(%rbp),%eax
  mov    %edx,%r8d
  mov    %eax,%ecx
  mov    $0xfbca7654,%edx
  lea    D96(%rip),%rax
  mov    %rax,%rsi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x40(%rbp)
  movl   $0xfbca7654,-0x3c(%rbp)
  mov    -0x40(%rbp),%edx
  mov    -0x3c(%rbp),%eax
  mov    $0xfbca7654,%esi
  mov    %edx,%ecx
  mov    %eax,%edx
  mov    %esi,%eax
  cmpxchg %cl,%dl
  mov    %ecx,-0x40(%rbp)
  mov    %edx,-0x3c(%rbp)
  mov    -0x3c(%rbp),%edx
  mov    -0x40(%rbp),%eax
  mov    %edx,%r8d
  mov    %eax,%ecx
  mov    $0xfbca7654,%edx
  lea    D305(%rip),%rax
  mov    %rax,%rsi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x38(%rbp)
  movl   $0xfbca7654,-0x34(%rbp)
  mov    -0x38(%rbp),%edx
  mov    -0x34(%rbp),%eax
  mov    $0xfffefdfc,%esi
  mov    %edx,%ecx
  mov    %eax,%edx
  mov    %esi,%eax
  cmpxchg %ecx,%edx
  mov    %ecx,-0x38(%rbp)
  mov    %edx,-0x34(%rbp)
  mov    -0x34(%rbp),%edx
  mov    -0x38(%rbp),%eax
  mov    %edx,%r8d
  mov    %eax,%ecx
  mov    $0xfffefdfc,%edx
  lea    D41(%rip),%rax
  mov    %rax,%rsi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x30(%rbp)
  movl   $0xfbca7654,-0x2c(%rbp)
  mov    -0x30(%rbp),%edx
  mov    -0x2c(%rbp),%eax
  mov    $0xfffefdfc,%esi
  mov    %edx,%ecx
  mov    %eax,%edx
  mov    %esi,%eax
  cmpxchg %cx,%dx
  mov    %ecx,-0x30(%rbp)
  mov    %edx,-0x2c(%rbp)
  mov    -0x2c(%rbp),%edx
  mov    -0x30(%rbp),%eax
  mov    %edx,%r8d
  mov    %eax,%ecx
  mov    $0xfffefdfc,%edx
  lea    D96(%rip),%rax
  mov    %rax,%rsi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x28(%rbp)
  movl   $0xfbca7654,-0x24(%rbp)
  mov    -0x28(%rbp),%edx
  mov    -0x24(%rbp),%eax
  mov    $0xfffefdfc,%esi
  mov    %edx,%ecx
  mov    %eax,%edx
  mov    %esi,%eax
  cmpxchg %cl,%dl
  mov    %ecx,-0x28(%rbp)
  mov    %edx,-0x24(%rbp)
  mov    -0x24(%rbp),%edx
  mov    -0x28(%rbp),%eax
  mov    %edx,%r8d
  mov    %eax,%ecx
  mov    $0xfffefdfc,%edx
  lea    D305(%rip),%rax
  mov    %rax,%rsi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x20(%rbp)
  movl   $0xfbca7654,-0x78(%rbp)
  mov    -0x20(%rbp),%eax
  mov    $0xfbca7654,%ecx
  mov    %eax,%edx
  mov    %ecx,%eax
  cmpxchg %edx,-0x78(%rbp)
  mov    %edx,-0x20(%rbp)
  mov    -0x78(%rbp),%edx
  mov    -0x20(%rbp),%eax
  mov    %edx,%r8d
  mov    %eax,%ecx
  mov    $0xfbca7654,%edx
  lea    D41(%rip),%rax
  mov    %rax,%rsi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x1c(%rbp)
  movl   $0xfbca7654,-0x78(%rbp)
  mov    -0x1c(%rbp),%eax
  mov    $0xfbca7654,%ecx
  mov    %eax,%edx
  mov    %ecx,%eax
  cmpxchg %dx,-0x78(%rbp)
  mov    %edx,-0x1c(%rbp)
  mov    -0x78(%rbp),%edx
  mov    -0x1c(%rbp),%eax
  mov    %edx,%r8d
  mov    %eax,%ecx
  mov    $0xfbca7654,%edx
  lea    D96(%rip),%rax
  mov    %rax,%rsi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x18(%rbp)
  movl   $0xfbca7654,-0x78(%rbp)
  mov    -0x18(%rbp),%eax
  mov    $0xfbca7654,%ecx
  mov    %eax,%edx
  mov    %ecx,%eax
  cmpxchg %dl,-0x78(%rbp)
  mov    %edx,-0x18(%rbp)
  mov    -0x78(%rbp),%edx
  mov    -0x18(%rbp),%eax
  mov    %edx,%r8d
  mov    %eax,%ecx
  mov    $0xfbca7654,%edx
  lea    D305(%rip),%rax
  mov    %rax,%rsi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x14(%rbp)
  movl   $0xfbca7654,-0x78(%rbp)
  mov    -0x14(%rbp),%eax
  mov    $0xfffefdfc,%ecx
  mov    %eax,%edx
  mov    %ecx,%eax
  cmpxchg %edx,-0x78(%rbp)
  mov    %edx,-0x14(%rbp)
  mov    -0x78(%rbp),%edx
  mov    -0x14(%rbp),%eax
  mov    %edx,%r8d
  mov    %eax,%ecx
  mov    $0xfffefdfc,%edx
  lea    D41(%rip),%rax
  mov    %rax,%rsi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0x10(%rbp)
  movl   $0xfbca7654,-0x78(%rbp)
  mov    -0x10(%rbp),%eax
  mov    $0xfffefdfc,%ecx
  mov    %eax,%edx
  mov    %ecx,%eax
  cmpxchg %dx,-0x78(%rbp)
  mov    %edx,-0x10(%rbp)
  mov    -0x78(%rbp),%edx
  mov    -0x10(%rbp),%eax
  mov    %edx,%r8d
  mov    %eax,%ecx
  mov    $0xfffefdfc,%edx
  lea    D96(%rip),%rax
  mov    %rax,%rsi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  movl   $0x12345678,-0xc(%rbp)
  movl   $0xfbca7654,-0x78(%rbp)
  mov    -0xc(%rbp),%eax
  mov    $0xfffefdfc,%ecx
  mov    %eax,%edx
  mov    %ecx,%eax
  cmpxchg %dl,-0x78(%rbp)
  mov    %edx,-0xc(%rbp)
  mov    -0x78(%rbp),%edx
  mov    -0xc(%rbp),%eax
  mov    %edx,%r8d
  mov    %eax,%ecx
  mov    $0xfffefdfc,%edx
  lea    D305(%rip),%rax
  mov    %rax,%rsi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  nop
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L5
  call   <__stack_chk_fail@plt>
L5:
  leave
  ret
```

tool_calls: name: unpack_data
arguments: tag: D283
type_guessed: string
name: unpack_data
arguments: tag: D201
type_guessed: string
name: unpack_data
arguments: tag: D234
type_guessed: string
name: unpack_data
arguments: tag: D208
type_guessed: string
name: unpack_data
arguments: tag: D41
type_guessed: string
name: unpack_data
arguments: tag: D59
type_guessed: string
name: unpack_data
arguments: tag: D96
type_guessed: string
name: unpack_data
arguments: tag: D305
type_guessed: string

tool: D283: xchgl

tool: D201: %-10s A=%08x B=%08x


tool: D234: xchgw

tool: D208: xchgb

tool: D41: cmpxchgl

tool: D59: %-10s EAX=%08x A=%08x C=%08x


tool: D96: cmpxchgw

tool: D305: cmpxchgb

assistant: ```c
void test_xchg(void) {
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("xchgl"
        " %"
        ""
        "0, %"
        ""
        "1"
        : "=q"(op0), "=q"(op1)
        : "0"(op0), "1"(op1));
    printf("%-10s A=%08x B=%08x\n", "xchgl", op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("xchgw"
        " %"
        "w"
        "0, %"
        "w"
        "1"
        : "=q"(op0), "=q"(op1)
        : "0"(op0), "1"(op1));
    printf("%-10s A=%08x B=%08x\n", "xchgw", op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("xchgb"
        " %"
        "b"
        "0, %"
        "b"
        "1"
        : "=q"(op0), "=q"(op1)
        : "0"(op0), "1"(op1));
    printf("%-10s A=%08x B=%08x\n", "xchgb", op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("xchgl"
        " %"
        ""
        "0, %"
        ""
        "1"
        : "=q"(op0), "=m"(op1)
        : "0"(op0), "1"(op1));
    printf("%-10s A=%08x B=%08x\n", "xchgl", op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("xchgw"
        " %"
        "w"
        "0, %"
        "w"
        "1"
        : "=q"(op0), "=m"(op1)
        : "0"(op0), "1"(op1));
    printf("%-10s A=%08x B=%08x\n", "xchgw", op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("xchgb"
        " %"
        "b"
        "0, %"
        "b"
        "1"
        : "=q"(op0), "=m"(op1)
        : "0"(op0), "1"(op1));
    printf("%-10s A=%08x B=%08x\n", "xchgb", op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("cmpxchgl"
        " %"
        ""
        "0, %"
        ""
        "1"
        : "=q"(op0), "=q"(op1)
        : "0"(op0), "1"(op1), "a"(0xfbca7654));
    printf("%-10s EAX=%08x A=%08x C=%08x\n", "cmpxchgl", 0xfbca7654, op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("cmpxchgw"
        " %"
        "w"
        "0, %"
        "w"
        "1"
        : "=q"(op0), "=q"(op1)
        : "0"(op0), "1"(op1), "a"(0xfbca7654));
    printf("%-10s EAX=%08x A=%08x C=%08x\n", "cmpxchgw", 0xfbca7654, op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("cmpxchgb"
        " %"
        "b"
        "0, %"
        "b"
        "1"
        : "=q"(op0), "=q"(op1)
        : "0"(op0), "1"(op1), "a"(0xfbca7654));
    printf("%-10s EAX=%08x A=%08x C=%08x\n", "cmpxchgb", 0xfbca7654, op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("cmpxchgl"
        " %"
        ""
        "0, %"
        ""
        "1"
        : "=q"(op0), "=q"(op1)
        : "0"(op0), "1"(op1), "a"(0xfffefdfc));
    printf("%-10s EAX=%08x A=%08x C=%08x\n", "cmpxchgl", 0xfffefdfc, op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("cmpxchgw"
        " %"
        "w"
        "0, %"
        "w"
        "1"
        : "=q"(op0), "=q"(op1)
        : "0"(op0), "1"(op1), "a"(0xfffefdfc));
    printf("%-10s EAX=%08x A=%08x C=%08x\n", "cmpxchgw", 0xfffefdfc, op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("cmpxchgb"
        " %"
        "b"
        "0, %"
        "b"
        "1"
        : "=q"(op0), "=q"(op1)
        : "0"(op0), "1"(op1), "a"(0xfffefdfc));
    printf("%-10s EAX=%08x A=%08x C=%08x\n", "cmpxchgb", 0xfffefdfc, op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("cmpxchgl"
        " %"
        ""
        "0, %"
        ""
        "1"
        : "=q"(op0), "=m"(op1)
        : "0"(op0), "1"(op1), "a"(0xfbca7654));
    printf("%-10s EAX=%08x A=%08x C=%08x\n", "cmpxchgl", 0xfbca7654, op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("cmpxchgw"
        " %"
        "w"
        "0, %"
        "w"
        "1"
        : "=q"(op0), "=m"(op1)
        : "0"(op0), "1"(op1), "a"(0xfbca7654));
    printf("%-10s EAX=%08x A=%08x C=%08x\n", "cmpxchgw", 0xfbca7654, op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("cmpxchgb"
        " %"
        "b"
        "0, %"
        "b"
        "1"
        : "=q"(op0), "=m"(op1)
        : "0"(op0), "1"(op1), "a"(0xfbca7654));
    printf("%-10s EAX=%08x A=%08x C=%08x\n", "cmpxchgb", 0xfbca7654, op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("cmpxchgl"
        " %"
        ""
        "0, %"
        ""
        "1"
        : "=q"(op0), "=m"(op1)
        : "0"(op0), "1"(op1), "a"(0xfffefdfc));
    printf("%-10s EAX=%08x A=%08x C=%08x\n", "cmpxchgl", 0xfffefdfc, op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("cmpxchgw"
        " %"
        "w"
        "0, %"
        "w"
        "1"
        : "=q"(op0), "=m"(op1)
        : "0"(op0), "1"(op1), "a"(0xfffefdfc));
    printf("%-10s EAX=%08x A=%08x C=%08x\n", "cmpxchgw", 0xfffefdfc, op0, op1);
  };
  {
    int op0, op1;
    op0 = 0x12345678;
    op1 = 0xfbca7654;
    asm("cmpxchgb"
        " %"
        "b"
        "0, %"
        "b"
        "1"
        : "=q"(op0), "=m"(op1)
        : "0"(op0), "1"(op1), "a"(0xfffefdfc));
    printf("%-10s EAX=%08x A=%08x C=%08x\n", "cmpxchgb", 0xfffefdfc, op0, op1);
  };
}
```