user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<threadFn2>:
  endbr64
  push   %r13
  xor    %esi,%esi
  mov    %rdi,%r13
  push   %r12
  push   %rbp
  push   %rbx
  xor    %ebx,%ebx
  sub    $0x48,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x38(%rsp)
  xor    %eax,%eax
  mov    %rsp,%rdi
  lea    0x10(%rsp),%r12
  lea    0x20(%rsp),%rbp
  call   <gettimeofday@plt>
  nopw   0x0(%rax,%rax,1)
L39:
  xor    %esi,%esi
  mov    %r12,%rdi
  call   <gettimeofday@plt>
  mov    $0x4,%edi
  call   <malloc@plt>
  mov    %ebx,(%rax)
  mov    %rax,%rdi
  add    $0x1,%ebx
  call   <free@plt>
  xor    %esi,%esi
  mov    %rbp,%rdi
  call   <gettimeofday@plt>
  cmp    $0x3e8,%ebx
  jne    L39
  mov    %r13,%rdi
  xor    %esi,%esi
  call   <gettimeofday@plt>
  mov    (%rsp),%rdi
  mov    0x0(%r13),%rcx
  cmp    %rcx,%rdi
  jle    L49
  lea    -0x1(%rdi),%r9
  mov    0x8(%r13),%r8d
  movabs $0x20c49ba5e353f7cf,%rsi
  sub    %rcx,%r9
  mov    %r9,%rdx
  shr    $0x3,%rdx
  mov    %rdx,%rax
  mul    %rsi
  shr    $0x4,%rdx
  lea    0x1(%rdx),%rsi
  cmp    $0x176f,%r9
  jbe    L30
  lea    0x3e8(%rcx),%rax
  movd   %r8d,%xmm5
  movq   %rcx,%xmm3
  mov    %rsi,%rdx
  movq   %rax,%xmm4
  pshufd $0x0,%xmm5,%xmm2
  shr    $0x2,%rdx
  xor    %eax,%eax
  paddd  D0(%rip),%xmm2
  movdqa D18(%rip),%xmm7
  punpcklqdq %xmm4,%xmm3
  pcmpeqd %xmm4,%xmm4
  movdqa D7(%rip),%xmm6
  movdqa D30(%rip),%xmm5
  nopl   0x0(%rax)
L52:
  movdqa %xmm2,%xmm1
  movdqa %xmm3,%xmm0
  paddd  %xmm7,%xmm2
  add    $0x1,%eax
  paddq  %xmm6,%xmm3
  paddq  %xmm5,%xmm0
  paddd  %xmm4,%xmm1
  cmp    %edx,%eax
  jne    L52
  mov    %rsi,%r9
  pshufd $0xff,%xmm1,%xmm1
  movhlps %xmm0,%xmm6
  and    $0xfffffffffffffffc,%r9
  movd   %xmm1,%edx
  movq   %xmm6,%rax
  imul   $0x3e8,%r9,%r10
  sub    %r9d,%r8d
  add    %r10,%rcx
  cmp    %r9,%rsi
  je     L114
L30:
  lea    0x3e8(%rcx),%rax
  lea    -0x1(%r8),%edx
  cmp    %rdi,%rax
  jge    L114
  lea    0x7d0(%rcx),%rax
  lea    -0x2(%r8),%edx
  cmp    %rax,%rdi
  jle    L114
  lea    0xbb8(%rcx),%rax
  lea    -0x3(%r8),%edx
  cmp    %rax,%rdi
  jle    L114
  lea    0xfa0(%rcx),%rax
  lea    -0x4(%r8),%edx
  cmp    %rax,%rdi
  jle    L114
  lea    0x1388(%rcx),%rax
  lea    -0x5(%r8),%edx
  cmp    %rax,%rdi
  jle    L114
  lea    0x1770(%rcx),%rax
  lea    -0x6(%r8),%edx
L114:
  sub    %rdi,%rax
  sub    0x8(%rsp),%edx
  xor    %edi,%edi
  mov    %edx,0x8(%r13)
  mov    %rax,0x0(%r13)
  call   <pthread_exit@plt>
  mov    0x38(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L62
  add    $0x48,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L49:
  mov    0x8(%r13),%edx
  mov    %rcx,%rax
  jmp    L114
L62:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: retrieve_data
arguments: label: D0
type: byte[16]
name: retrieve_data
arguments: label: D18
type: byte[16]
name: retrieve_data
arguments: label: D7
type: byte[16]
name: retrieve_data
arguments: label: D30
type: byte[16]

tool: {"D0": [0x00,0x00,0x00,0x00,0xff,0xff,0xff,0xff,0xfe,0xff,0xff,0xff,0xfd,0xff,0xff,0xff]}

tool: {"D18": [0xfc,0xff,0xff,0xff,0xfc,0xff,0xff,0xff,0xfc,0xff,0xff,0xff,0xfc,0xff,0xff,0xff]}

tool: {"D7": [0xa0,0x0f,0x00,0x00,0x00,0x00,0x00,0x00,0xa0,0x0f,0x00,0x00,0x00,0x00,0x00,0x00]}

tool: {"D30": [0xb8,0x0b,0x00,0x00,0x00,0x00,0x00,0x00,0xb8,0x0b,0x00,0x00,0x00,0x00,0x00,0x00]}

assistant: ```c
void *threadFn2(void *in_arg) {
  struct timeval *end = (struct timeval *)in_arg;
  struct timeval begin;
  struct timeval ignored0, ignored1;
  gettimeofday(&begin, NULL);
  for (int i = 0; i < 1000; i++) {
    gettimeofday(&ignored0, NULL);
    int *ptr = malloc(sizeof(int));
    *ptr = i;
    free(ptr);
    gettimeofday(&ignored1, NULL);
  }
  gettimeofday(end, NULL);
  while (begin.tv_usec > end->tv_usec) {
    end->tv_usec += 1000;
    end->tv_sec -= 1;
  }
  end->tv_sec -= begin.tv_sec;
  end->tv_usec -= begin.tv_usec;
  pthread_exit(NULL);
}
```