user: 请将以下的汇编代码转换成C语言代码:

```asm
<ss_swapmerge>:
  endbr64
  push   %r15
  mov    %rdx,%r15
  push   %r14
  xor    %r14d,%r14d
  push   %r13
  mov    %r14d,%r10d
  mov    %rsi,%r13
  mov    %rdi,%r14
  push   %r12
  mov    %rcx,%r12
  push   %rbp
  mov    %r8,%rbp
  push   %rbx
  sub    $0x458,%rsp
  mov    %r9,0x18(%rsp)
  mov    %fs:0x28,%rax
  mov    %rax,0x448(%rsp)
  xor    %eax,%eax
  movslq 0x490(%rsp),%rax
  movl   $0x0,0x28(%rsp)
  mov    %rax,0x8(%rsp)
L207:
  mov    %rbp,%rax
  sub    %r12,%rax
  mov    %rax,%rbx
  mov    %rax,0x10(%rsp)
  sar    $0x2,%rbx
  cmp    0x8(%rsp),%rbx
  jg     L379
  cmp    %r12,%r15
  jae    L249
  cmp    %rbp,%r12
  jb     L263
  nopw   0x0(%rax,%rax,1)
L249:
  test   $0x1,%r10b
  jne    L59
  test   $0x2,%r10b
  je     L255
  movslq (%r15),%rax
  lea    0x0(%r13,%rax,4),%rdx
  mov    -0x4(%r15),%eax
  test   %eax,%eax
  js     L358
L4:
  movslq %eax,%rsi
  mov    0x498(%rsp),%ecx
  xor    %eax,%eax
  mov    %r14,%rdi
  shl    $0x2,%rsi
  mov    %r10d,(%rsp)
  add    %r13,%rsi
  call   <ss_compare@plt>
  mov    (%rsp),%r10d
  test   %eax,%eax
  je     L59
  nopl   0x0(%rax,%rax,1)
L255:
  and    $0x4,%r10d
  je     L378
  movslq 0x0(%rbp),%rax
  lea    0x0(%r13,%rax,4),%rdx
  mov    -0x4(%rbp),%eax
  test   %eax,%eax
  jns    L328
  not    %eax
L328:
  movslq %eax,%rsi
  mov    0x498(%rsp),%ecx
  xor    %eax,%eax
  mov    %r14,%rdi
  lea    0x0(%r13,%rsi,4),%rsi
  call   <ss_compare@plt>
  test   %eax,%eax
  jne    L378
  notl   0x0(%rbp)
L378:
  mov    0x28(%rsp),%eax
  test   %eax,%eax
  je     L404
  sub    $0x1,%eax
  mov    %eax,0x28(%rsp)
  cltq
  shl    $0x5,%rax
  mov    0x40(%rsp,%rax,1),%r15
  mov    0x48(%rsp,%rax,1),%r12
  mov    0x50(%rsp,%rax,1),%rbp
  mov    0x58(%rsp,%rax,1),%r10d
  jmp    L207
  nopw   0x0(%rax,%rax,1)
L59:
  notl   (%r15)
  jmp    L255
  nopl   (%rax)
L379:
  mov    %r12,%rax
  sub    %r15,%rax
  mov    %rax,0x20(%rsp)
  sar    $0x2,%rax
  cmp    0x8(%rsp),%rax
  jg     L107
  cmp    %r12,%r15
  jae    L249
  mov    %r10d,(%rsp)
  sub    $0x8,%rsp
  mov    %rbp,%r8
  mov    %r12,%rcx
  mov    0x4a0(%rsp),%eax
  mov    %r15,%rdx
  mov    %r13,%rsi
  mov    %r14,%rdi
  push   %rax
  mov    0x28(%rsp),%r9
  xor    %eax,%eax
  call   <ss_mergeforward@plt>
  pop    %r10
  pop    %r11
  mov    (%rsp),%r10d
  jmp    L249
  nopl   0x0(%rax,%rax,1)
L404:
  mov    0x448(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L412
  add    $0x458,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L263:
  mov    %r10d,(%rsp)
  sub    $0x8,%rsp
  mov    %r12,%rcx
  mov    %rbp,%r8
  mov    0x4a0(%rsp),%eax
  mov    %r15,%rdx
  mov    %r13,%rsi
  mov    %r14,%rdi
  push   %rax
  mov    0x28(%rsp),%r9
  xor    %eax,%eax
  call   <ss_mergebackward@plt>
  pop    %rbx
  pop    %r12
  mov    (%rsp),%r10d
  jmp    L249
  nopw   0x0(%rax,%rax,1)
L358:
  not    %eax
  jmp    L4
  nopw   0x0(%rax,%rax,1)
L107:
  mov    0x20(%rsp),%rcx
  cmp    %rcx,0x10(%rsp)
  cmovg  %eax,%ebx
  mov    %ebx,%r9d
  sar    %r9d
  test   %ebx,%ebx
  jle    L281
  mov    %r12,%rax
  mov    %r15,0x30(%rsp)
  mov    %ebx,%r12d
  mov    %r13,%r15
  mov    %rbp,0x38(%rsp)
  mov    %r9d,%r13d
  mov    0x498(%rsp),%ebp
  mov    %rax,%rbx
  movl   $0x0,(%rsp)
  mov    %r10d,0x2c(%rsp)
  jmp    L56
  nopl   0x0(%rax)
L370:
  mov    %r13d,%r12d
  mov    %r12d,%r13d
  sar    %r13d
  test   %r12d,%r12d
  jle    L386
L56:
  movslq (%rsp),%rax
  movslq %r13d,%rdx
  add    %rdx,%rax
  mov    $0xfffffffffffffffc,%rdx
  lea    0x0(,%rax,4),%rcx
  sub    %rcx,%rdx
  movslq (%rbx,%rdx,1),%rdx
  test   %edx,%edx
  jns    L162
  not    %edx
  movslq %edx,%rdx
L162:
  movslq (%rbx,%rax,4),%rsi
  lea    (%r15,%rdx,4),%rdx
  test   %esi,%esi
  jns    L36
  not    %esi
  movslq %esi,%rsi
L36:
  xor    %eax,%eax
  lea    (%r15,%rsi,4),%rsi
  mov    %ebp,%ecx
  mov    %r14,%rdi
  call   <ss_compare@plt>
  test   %eax,%eax
  jns    L370
  mov    (%rsp),%eax
  lea    0x1(%rax,%r13,1),%eax
  mov    %eax,(%rsp)
  mov    %r12d,%eax
  mov    %r13d,%r12d
  not    %eax
  and    $0x1,%eax
  sub    %eax,%r12d
  mov    %r12d,%r13d
  sar    %r13d
  test   %r12d,%r12d
  jg     L56
L386:
  mov    (%rsp),%edx
  mov    %r15,%r13
  mov    0x2c(%rsp),%r10d
  mov    %rbx,%r12
  mov    0x30(%rsp),%r15
  mov    0x38(%rsp),%rbp
  test   %edx,%edx
  jg     L299
L281:
  movslq (%r12),%rax
  lea    0x0(%r13,%rax,4),%rdx
  mov    -0x4(%r12),%eax
  test   %eax,%eax
  jns    L424
  not    %eax
L424:
  movslq %eax,%rsi
  mov    0x498(%rsp),%ecx
  xor    %eax,%eax
  mov    %r14,%rdi
  shl    $0x2,%rsi
  mov    %r10d,(%rsp)
  add    %r13,%rsi
  call   <ss_compare@plt>
  mov    (%rsp),%r10d
  test   %eax,%eax
  jne    L249
  notl   (%r12)
  jmp    L249
  nopl   0x0(%rax)
L299:
  movslq %edx,%rax
  mov    %r12,%rsi
  shl    $0x2,%rax
  sub    %rax,%rbx
  lea    (%r12,%rax,1),%r8
  xor    %eax,%eax
  mov    %rbx,%rdi
  mov    %r8,(%rsp)
  call   <ss_blockswap@plt>
  mov    (%rsp),%r8
  mov    0x2c(%rsp),%r10d
  cmp    %r8,%rbp
  jbe    L410
  mov    (%r8),%eax
  test   %eax,%eax
  js     L185
  cmp    %rbx,%r15
  jae    L410
  mov    (%r12),%esi
  mov    %r12,%rdx
  test   %esi,%esi
  jns    L332
  nopl   0x0(%rax)
L304:
  mov    0x4(%rdx),%ecx
  add    $0x4,%rdx
  test   %ecx,%ecx
  js     L304
  mov    %rbp,%rax
  mov    %r12,%rcx
  sub    %rdx,%rax
  mov    %rax,0x10(%rsp)
  mov    $0x2,%eax
  jmp    L312
  nopl   0x0(%rax,%rax,1)
L410:
  mov    %r12,%rdx
  mov    %r12,%rcx
  xor    %eax,%eax
L312:
  mov    0x28(%rsp),%r11d
  mov    %r10d,%edi
  and    $0x4,%r10d
  and    $0x3,%edi
  lea    0x1(%r11),%esi
  mov    %esi,(%rsp)
  mov    0x10(%rsp),%rsi
  cmp    %rsi,0x20(%rsp)
  jg     L54
  movslq %r11d,%r9
  mov    (%rsp),%esi
  mov    %rbx,%r12
  shl    $0x5,%r9
  mov    %rdx,0x40(%rsp,%r9,1)
  mov    %eax,%edx
  and    $0x4,%eax
  and    $0x3,%edx
  or     %edi,%eax
  mov    %rbp,0x50(%rsp,%r9,1)
  mov    %rcx,%rbp
  or     %r10d,%edx
  mov    %r8,0x48(%rsp,%r9,1)
  mov    %eax,%r10d
  mov    %edx,0x58(%rsp,%r9,1)
  mov    %esi,0x28(%rsp)
  jmp    L207
  nopw   0x0(%rax,%rax,1)
L54:
  test   $0x2,%al
  je     L223
  cmp    %rdx,%r12
  mov    %eax,%r9d
  sete   %r11b
  xor    $0x6,%r9d
  test   %r11b,%r11b
  cmovne %r9d,%eax
L223:
  movslq 0x28(%rsp),%r9
  mov    %r8,%r12
  shl    $0x5,%r9
  mov    %rcx,0x50(%rsp,%r9,1)
  mov    %eax,%ecx
  and    $0x3,%eax
  and    $0x4,%ecx
  or     %eax,%r10d
  mov    (%rsp),%eax
  mov    %r15,0x40(%rsp,%r9,1)
  or     %edi,%ecx
  mov    %rbx,0x48(%rsp,%r9,1)
  mov    %rdx,%r15
  mov    %ecx,0x58(%rsp,%r9,1)
  mov    %eax,0x28(%rsp)
  jmp    L207
L185:
  not    %eax
  mov    %r12,%rcx
  mov    %eax,(%r8)
  mov    $0x1,%eax
  cmp    %rbx,%r15
  jb     L430
L17:
  mov    %r12,%rdx
  jmp    L312
  nop
L430:
  mov    -0x4(%rcx),%edi
  sub    $0x4,%rcx
  test   %edi,%edi
  js     L430
  mov    %rcx,%rax
  sub    %r15,%rax
  mov    %rax,0x20(%rsp)
  mov    $0x5,%eax
  jmp    L17
L332:
  mov    %r12,%rcx
  mov    $0x2,%eax
  jmp    L312
L412:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
void ss_swapmerge(const unsigned char *T, const int *PA, int *first, int *middle, int *last, int *buf, int bufsize, int depth) {
  struct {
    int *a, *b, *c;
    int d;
  } stack[(32)];
  int *l, *r, *lm, *rm;
  int m, len, half;
  int ssize;
  int check, next;
  for (check = 0, ssize = 0;;) {
    if ((last - middle) <= bufsize) {
      if ((first < middle) && (middle < last)) {
        ss_mergebackward(T, PA, first, middle, last, buf, depth);
      }
      do {
        if (((check)&1) || (((check)&2) && (ss_compare(T, PA + ((0 <= (*((first)-1))) ? (*((first)-1)) : (~(*((first)-1)))), PA + *(first), depth) == 0))) {
          *(first) = ~*(first);
        }
        if (((check)&4) && ((ss_compare(T, PA + ((0 <= (*((last)-1))) ? (*((last)-1)) : (~(*((last)-1)))), PA + *(last), depth) == 0))) {
          *(last) = ~*(last);
        }
      } while (0);
      do {
        if (ssize == 0) {
          return;
        }
        (first) = stack[--ssize].a, (middle) = stack[ssize].b, (last) = stack[ssize].c, (check) = stack[ssize].d;
      } while (0);
      continue;
    }
    if ((middle - first) <= bufsize) {
      if (first < middle) {
        ss_mergeforward(T, PA, first, middle, last, buf, depth);
      }
      do {
        if (((check)&1) || (((check)&2) && (ss_compare(T, PA + ((0 <= (*((first)-1))) ? (*((first)-1)) : (~(*((first)-1)))), PA + *(first), depth) == 0))) {
          *(first) = ~*(first);
        }
        if (((check)&4) && ((ss_compare(T, PA + ((0 <= (*((last)-1))) ? (*((last)-1)) : (~(*((last)-1)))), PA + *(last), depth) == 0))) {
          *(last) = ~*(last);
        }
      } while (0);
      do {
        if (ssize == 0) {
          return;
        }
        (first) = stack[--ssize].a, (middle) = stack[ssize].b, (last) = stack[ssize].c, (check) = stack[ssize].d;
      } while (0);
      continue;
    }
    for (m = 0, len = (((middle - first) < (last - middle)) ? (middle - first) : (last - middle)), half = len >> 1; 0 < len; len = half, half >>= 1) {
      if (ss_compare(T, PA + ((0 <= (*(middle + m + half))) ? (*(middle + m + half)) : (~(*(middle + m + half)))), PA + ((0 <= (*(middle - m - half - 1))) ? (*(middle - m - half - 1)) : (~(*(middle - m - half - 1)))), depth) < 0) {
        m += half + 1;
        half -= (len & 1) ^ 1;
      }
    }
    if (0 < m) {
      lm = middle - m, rm = middle + m;
      ss_blockswap(lm, middle, m);
      l = r = middle, next = 0;
      if (rm < last) {
        if (*rm < 0) {
          *rm = ~*rm;
          if (first < lm) {
            for (; *--l < 0;) {
            }
            next |= 4;
          }
          next |= 1;
        } else if (first < lm) {
          for (; *r < 0; ++r) {
          }
          next |= 2;
        }
      }
      if ((l - first) <= (last - r)) {
        do {
          stack[ssize].a = (r), stack[ssize].b = (rm), stack[ssize].c = (last), stack[ssize++].d = ((next & 3) | (check & 4));
        } while (0);
        middle = lm, last = l, check = (check & 3) | (next & 4);
      } else {
        if ((next & 2) && (r == middle)) {
          next ^= 6;
        }
        do {
          stack[ssize].a = (first), stack[ssize].b = (lm), stack[ssize].c = (l), stack[ssize++].d = ((check & 3) | (next & 4));
        } while (0);
        first = r, middle = rm, check = (next & 3) | (check & 4);
      }
    } else {
      if (ss_compare(T, PA + ((0 <= (*(middle - 1))) ? (*(middle - 1)) : (~(*(middle - 1)))), PA + *middle, depth) == 0) {
        *middle = ~*middle;
      }
      do {
        if (((check)&1) || (((check)&2) && (ss_compare(T, PA + ((0 <= (*((first)-1))) ? (*((first)-1)) : (~(*((first)-1)))), PA + *(first), depth) == 0))) {
          *(first) = ~*(first);
        }
        if (((check)&4) && ((ss_compare(T, PA + ((0 <= (*((last)-1))) ? (*((last)-1)) : (~(*((last)-1)))), PA + *(last), depth) == 0))) {
          *(last) = ~*(last);
        }
      } while (0);
      do {
        if (ssize == 0) {
          return;
        }
        (first) = stack[--ssize].a, (middle) = stack[ssize].b, (last) = stack[ssize].c, (check) = stack[ssize].d;
      } while (0);
    }
  }
}
```