user: 这段汇编代码用C语言表示是什么样的：

```asm
<ss_swapmerge>:
  endbr64
  push   %r15
  mov    %rdi,%r15
  push   %r14
  mov    %rdx,%r14
  push   %r13
  mov    %rsi,%r13
  push   %r12
  push   %rbp
  mov    %rcx,%rbp
  push   %rbx
  mov    %r8,%rbx
  sub    $0x488,%rsp
  mov    %r9,0x40(%rsp)
  mov    %fs:0x28,%rax
  mov    %rax,0x478(%rsp)
  xor    %eax,%eax
  movslq 0x4c0(%rsp),%rax
  movl   $0x0,0xc(%rsp)
  movl   $0x0,0x28(%rsp)
  mov    %rax,0x10(%rsp)
L311:
  mov    %rbx,%rax
  sub    %rbp,%rax
  mov    %rax,%r12
  mov    %rax,0x20(%rsp)
  sar    $0x2,%r12
  cmp    0x10(%rsp),%r12
  jg     L13
  cmp    %rbp,%r14
  jae    L390
  cmp    %rbx,%rbp
  jb     L221
  nopl   0x0(%rax)
L390:
  testb  $0x1,0xc(%rsp)
  jne    L304
  testb  $0x2,0xc(%rsp)
  je     L399
  movslq (%r14),%rax
  lea    0x0(%r13,%rax,4),%rdx
  mov    -0x4(%r14),%eax
  test   %eax,%eax
  js     L3
L145:
  movslq %eax,%rsi
  mov    0x4c8(%rsp),%ecx
  xor    %eax,%eax
  mov    %r15,%rdi
  lea    0x0(%r13,%rsi,4),%rsi
  call   <ss_compare@plt>
  test   %eax,%eax
  je     L304
  nop
L399:
  testb  $0x4,0xc(%rsp)
  je     L68
  movslq (%rbx),%rax
  lea    0x0(%r13,%rax,4),%rdx
  mov    -0x4(%rbx),%eax
  test   %eax,%eax
  jns    L159
  not    %eax
L159:
  movslq %eax,%rsi
  mov    0x4c8(%rsp),%ecx
  xor    %eax,%eax
  mov    %r15,%rdi
  lea    0x0(%r13,%rsi,4),%rsi
  call   <ss_compare@plt>
  test   %eax,%eax
  jne    L68
  notl   (%rbx)
L68:
  mov    $0x1,%edi
  xor    %eax,%eax
  call   <assert@plt>
  mov    0x28(%rsp),%eax
  test   %eax,%eax
  je     L259
  sub    $0x1,%eax
  mov    %eax,0x28(%rsp)
  cltq
  shl    $0x5,%rax
  mov    0x70(%rsp,%rax,1),%r14
  mov    0x78(%rsp,%rax,1),%rbp
  mov    0x80(%rsp,%rax,1),%rbx
  mov    0x88(%rsp,%rax,1),%eax
  mov    %eax,0xc(%rsp)
  jmp    L311
  xchg   %ax,%ax
L304:
  notl   (%r14)
  jmp    L399
  nopl   0x0(%rax,%rax,1)
L13:
  mov    %rbp,%rax
  sub    %r14,%rax
  mov    %rax,0x30(%rsp)
  sar    $0x2,%rax
  cmp    0x10(%rsp),%rax
  jg     L405
  cmp    %rbp,%r14
  jae    L390
  sub    $0x8,%rsp
  mov    %r13,%rsi
  mov    %r15,%rdi
  mov    %rbx,%r8
  mov    0x4d0(%rsp),%eax
  mov    %rbp,%rcx
  mov    %r14,%rdx
  push   %rax
  mov    0x50(%rsp),%r9
  xor    %eax,%eax
  call   <ss_mergeforward@plt>
  pop    %rsi
  pop    %rdi
  jmp    L390
  nopl   0x0(%rax)
L259:
  mov    0x478(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L465
  add    $0x488,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L221:
  sub    $0x8,%rsp
  mov    %rbx,%r8
  mov    %rbp,%rcx
  mov    %r14,%rdx
  mov    0x4d0(%rsp),%eax
  mov    %r13,%rsi
  mov    %r15,%rdi
  push   %rax
  mov    0x50(%rsp),%r9
  xor    %eax,%eax
  call   <ss_mergebackward@plt>
  pop    %r8
  pop    %r9
  jmp    L390
  nopl   0x0(%rax,%rax,1)
L3:
  not    %eax
  jmp    L145
  nopw   0x0(%rax,%rax,1)
L405:
  mov    0x30(%rsp),%rcx
  cmp    %rcx,0x20(%rsp)
  cmovg  %eax,%r12d
  mov    %r12d,%r9d
  sar    %r9d
  test   %r12d,%r12d
  jle    L398
  mov    %r14,0x48(%rsp)
  mov    %rbp,%r14
  mov    0x4c8(%rsp),%ebp
  mov    %rbx,0x60(%rsp)
  mov    %r13,%rbx
  mov    %r9d,%r13d
  movl   $0x0,0x2c(%rsp)
  movq   $0x0,0x18(%rsp)
  jmp    L192
  nopw   0x0(%rax,%rax,1)
L107:
  mov    %r13d,%eax
  sar    %eax
  test   %r13d,%r13d
  jle    L226
L98:
  mov    %r13d,%r12d
  mov    %eax,%r13d
L192:
  movslq %r13d,%rax
  add    0x18(%rsp),%rax
  mov    $0xfffffffffffffffc,%rdx
  lea    0x0(,%rax,4),%rcx
  sub    %rcx,%rdx
  movslq (%r14,%rdx,1),%rdx
  test   %edx,%edx
  jns    L295
  not    %edx
  movslq %edx,%rdx
L295:
  movslq (%r14,%rax,4),%rsi
  lea    (%rbx,%rdx,4),%rdx
  test   %esi,%esi
  jns    L207
  not    %esi
  movslq %esi,%rsi
L207:
  xor    %eax,%eax
  lea    (%rbx,%rsi,4),%rsi
  mov    %ebp,%ecx
  mov    %r15,%rdi
  call   <ss_compare@plt>
  test   %eax,%eax
  jns    L107
  mov    0x2c(%rsp),%eax
  not    %r12d
  and    $0x1,%r12d
  lea    0x1(%r13,%rax,1),%edi
  sub    %r12d,%r13d
  mov    %r13d,%eax
  mov    %edi,0x2c(%rsp)
  sar    %eax
  test   %r13d,%r13d
  jle    L226
  movslq %edi,%rcx
  mov    %rcx,0x18(%rsp)
  jmp    L98
  nopl   0x0(%rax,%rax,1)
L226:
  mov    0x2c(%rsp),%edx
  mov    %rbx,%r13
  mov    %r14,%rbp
  mov    0x60(%rsp),%rbx
  mov    0x48(%rsp),%r14
  test   %edx,%edx
  jg     L110
L398:
  movslq 0x0(%rbp),%rax
  lea    0x0(%r13,%rax,4),%rdx
  mov    -0x4(%rbp),%eax
  test   %eax,%eax
  jns    L376
  not    %eax
L376:
  movslq %eax,%rsi
  mov    0x4c8(%rsp),%ecx
  xor    %eax,%eax
  mov    %r15,%rdi
  lea    0x0(%r13,%rsi,4),%rsi
  call   <ss_compare@plt>
  test   %eax,%eax
  jne    L390
  notl   0x0(%rbp)
  jmp    L390
  nopl   0x0(%rax,%rax,1)
L110:
  movslq %edx,%rax
  mov    %rbp,%r12
  movq   %r14,%xmm1
  mov    %rbp,%rsi
  shl    $0x2,%rax
  sub    %rax,%r12
  lea    0x0(%rbp,%rax,1),%rdi
  xor    %eax,%eax
  movq   %r12,%xmm2
  mov    %rdi,0x18(%rsp)
  mov    %r12,%rdi
  punpcklqdq %xmm2,%xmm1
  movaps %xmm1,0x50(%rsp)
  call   <ss_blockswap@plt>
  mov    0x18(%rsp),%rdi
  cmp    %rdi,%rbx
  jbe    L64
  mov    (%rdi),%eax
  test   %eax,%eax
  js     L132
  cmp    %r12,%r14
  jae    L64
  mov    0x0(%rbp),%r9d
  mov    %rbp,%rcx
  test   %r9d,%r9d
  jns    L54
  nopl   0x0(%rax,%rax,1)
L320:
  mov    0x4(%rcx),%r8d
  add    $0x4,%rcx
  test   %r8d,%r8d
  js     L320
  mov    %rbx,%rax
  movl   $0x0,0x2c(%rsp)
  mov    %rbp,%rdx
  mov    $0x2,%esi
  sub    %rcx,%rax
  mov    %rax,0x20(%rsp)
  jmp    L290
  nopw   0x0(%rax,%rax,1)
L64:
  movl   $0x0,0x2c(%rsp)
  mov    %rbp,%rcx
  mov    %rbp,%rdx
  xor    %esi,%esi
L290:
  mov    0x28(%rsp),%r11d
  mov    0xc(%rsp),%eax
  xor    %edi,%edi
  movq   %rcx,%xmm0
  movhps 0x18(%rsp),%xmm0
  cmp    $0x1f,%r11d
  mov    %eax,%r10d
  setle  %dil
  and    $0x4,%eax
  and    $0x3,%r10d
  mov    %eax,0x48(%rsp)
  lea    0x1(%r11),%eax
  mov    %r10d,0xc(%rsp)
  mov    0x20(%rsp),%r10
  mov    %eax,0x60(%rsp)
  cmp    %r10,0x30(%rsp)
  jle    L336
  test   $0x2,%sil
  je     L305
  cmp    %rcx,%rbp
  jne    L305
  xor    $0x6,%esi
  mov    %esi,%eax
  and    $0x4,%eax
  mov    %eax,0x2c(%rsp)
  nop
L305:
  xor    %eax,%eax
  mov    %esi,0x30(%rsp)
  mov    %rdx,0x20(%rsp)
  mov    %rcx,0x68(%rsp)
  call   <assert@plt>
  movslq 0x28(%rsp),%rax
  mov    0x20(%rsp),%rdx
  movdqa 0x50(%rsp),%xmm3
  mov    0x30(%rsp),%esi
  shl    $0x5,%rax
  mov    0x48(%rsp),%ebp
  mov    0x68(%rsp),%r14
  mov    %rdx,0x80(%rsp,%rax,1)
  mov    0x2c(%rsp),%edx
  and    $0x3,%esi
  or     0xc(%rsp),%edx
  movaps %xmm3,0x70(%rsp,%rax,1)
  or     %esi,%ebp
  mov    %edx,0x88(%rsp,%rax,1)
  mov    0x60(%rsp),%eax
  mov    %ebp,0xc(%rsp)
  mov    0x18(%rsp),%rbp
  mov    %eax,0x28(%rsp)
  jmp    L311
L132:
  not    %eax
  mov    %rbp,%rdx
  mov    %eax,(%rdi)
  cmp    %r12,%r14
  jb     L40
  movl   $0x0,0x2c(%rsp)
  mov    $0x1,%esi
L215:
  mov    %rbp,%rcx
  jmp    L290
  xchg   %ax,%ax
L40:
  mov    -0x4(%rdx),%r10d
  sub    $0x4,%rdx
  test   %r10d,%r10d
  js     L40
  mov    %rdx,%rax
  movl   $0x4,0x2c(%rsp)
  mov    $0x5,%esi
  sub    %r14,%rax
  mov    %rax,0x30(%rsp)
  jmp    L215
  nopw   0x0(%rax,%rax,1)
L336:
  xor    %eax,%eax
  mov    %esi,0x20(%rsp)
  movaps %xmm0,0x30(%rsp)
  mov    %rdx,0x18(%rsp)
  call   <assert@plt>
  mov    0x20(%rsp),%esi
  movslq 0x28(%rsp),%rax
  mov    0x48(%rsp),%ebp
  movdqa 0x30(%rsp),%xmm0
  and    $0x3,%esi
  shl    $0x5,%rax
  or     %esi,%ebp
  mov    %rbx,0x80(%rsp,%rax,1)
  mov    0x18(%rsp),%rbx
  mov    %ebp,0x88(%rsp,%rax,1)
  mov    %r12,%rbp
  movaps %xmm0,0x70(%rsp,%rax,1)
  mov    0x2c(%rsp),%eax
  or     0xc(%rsp),%eax
  mov    %eax,0xc(%rsp)
  mov    0x60(%rsp),%eax
  mov    %eax,0x28(%rsp)
  jmp    L311
L54:
  movl   $0x0,0x2c(%rsp)
  mov    %rbp,%rdx
  mov    $0x2,%esi
  jmp    L290
L465:
  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 {
        assert(0 <= ssize);
        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 {
        assert(0 <= ssize);
        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 {
          assert(ssize < (32));
          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 {
          assert(ssize < (32));
          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 {
        assert(0 <= ssize);
        if (ssize == 0) {
          return;
        }
        (first) = stack[--ssize].a, (middle) = stack[ssize].b, (last) = stack[ssize].c, (check) = stack[ssize].d;
      } while (0);
    }
  }
}
```