user: 请从给定的汇编指令推导出C源代码：

```asm
<next_combo_b>:
  endbr64
  push   %r15
  mov    %rsi,%r10
  lea    -0x1(%rdx),%eax
  push   %r14
  push   %r13
  mov    %edi,%r13d
  push   %r12
  push   %rbp
  push   %rbx
  mov    %r9,%rbx
  sub    $0x48,%rsp
  mov    0x80(%rsp),%esi
  mov    %rcx,0x18(%rsp)
  mov    %r8,0x10(%rsp)
  mov    %eax,0xc(%rsp)
  test   %esi,%esi
  je     L521
  mov    %edx,%ebp
  test   %edi,%edi
  jle    L568
  movslq %edi,%rdx
  xor    %esi,%esi
  mov    %r9,%rdi
  mov    %r10,0x20(%rsp)
  shl    $0x2,%rdx
  call   <memset@plt>
  mov    0x20(%rsp),%r10
L568:
  test   %ebp,%ebp
  jle    L435
  mov    0x10(%rsp),%rdi
  movslq %ebp,%rdx
  xor    %esi,%esi
  mov    %r10,0x20(%rsp)
  shl    $0x2,%rdx
  call   <memset@plt>
  mov    0x20(%rsp),%r10
L435:
  mov    $0xffffffff,%ebp
L226:
  lea    -0x1(%r13),%ecx
L371:
  mov    %r13d,%eax
  mov    %r13d,%r9d
  shr    $0x2,%eax
  and    $0xfffffffc,%r9d
  lea    -0x1(%rax),%r15d
  add    $0x1,%r15
  shl    $0x4,%r15
  cmp    0xc(%rsp),%ebp
  je     L11
  nopl   0x0(%rax)
L165:
  mov    0x10(%rsp),%rax
  lea    0x1(%rbp),%r8d
  movslq %r8d,%r14
  lea    (%rax,%r14,4),%r11
  movl   $0x1,(%r11)
  imul   $0x3e8,%r14,%r14
  test   %r13d,%r13d
  jle    L471
  lea    0x4(%r10,%r14,1),%rdx
  mov    %rbx,%rax
  movslq %ebp,%rbp
  sub    %rdx,%rax
  cmp    $0x8,%rax
  jbe    L640
  cmp    $0x1,%r13d
  je     L640
  cmp    $0x2,%ecx
  jbe    L210
  lea    (%r10,%r14,1),%r12
  xor    %eax,%eax
  nopl   0x0(%rax,%rax,1)
L52:
  movdqu (%rbx,%rax,1),%xmm0
  movdqu (%r12,%rax,1),%xmm2
  paddd  %xmm2,%xmm0
  movups %xmm0,(%rbx,%rax,1)
  add    $0x10,%rax
  cmp    %r15,%rax
  jne    L52
  cmp    %r9d,%r13d
  je     L621
  mov    %r13d,%edi
  sub    %r9d,%edi
  cmp    $0x1,%edi
  je     L635
  mov    %r9d,%esi
  mov    %r9d,%eax
L363:
  lea    0x1(%rbp),%rdx
  lea    (%rbx,%rsi,4),%r12
  imul   $0xfa,%rdx,%rdx
  movq   (%r12),%xmm1
  add    %rsi,%rdx
  movq   (%r10,%rdx,4),%xmm0
  mov    %edi,%edx
  and    $0xfffffffe,%edx
  paddd  %xmm1,%xmm0
  add    %edx,%eax
  movq   %xmm0,(%r12)
  lea    (%r10,%r14,1),%r12
  cmp    %edi,%edx
  je     L276
L378:
  cltq
  shl    $0x2,%rax
  mov    (%r12,%rax,1),%edx
  add    %edx,(%rbx,%rax,1)
L276:
  mov    0x18(%rsp),%rdi
  xor    %edx,%edx
  mov    %rbx,%rsi
  mov    %r10,0x38(%rsp)
  mov    %r9d,0x34(%rsp)
  mov    %r8d,0x30(%rsp)
  mov    %r11,0x28(%rsp)
  mov    %ecx,0x20(%rsp)
  call   <var_check_1@plt>
  mov    0x20(%rsp),%ecx
  mov    0x28(%rsp),%r11
  test   %eax,%eax
  mov    0x30(%rsp),%r8d
  mov    0x34(%rsp),%r9d
  mov    0x38(%rsp),%r10
  je     L582
  nopl   (%rax)
L432:
  mov    %r8d,%ebp
  cmp    0xc(%rsp),%ebp
  jne    L165
L11:
  test   %r13d,%r13d
  jle    L321
  mov    $0x1,%esi
  nop
L38:
  mov    -0x4(%rbx,%rsi,4),%edx
  cmp    %esi,%r13d
  setg   %dil
  test   %edx,%edx
  setne  %al
  add    $0x1,%rsi
  test   %al,%dil
  jne    L38
  test   %edx,%edx
  je     L143
L321:
  mov    $0x1,%r11d
L622:
  add    $0x48,%rsp
  mov    %r11d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L640:
  mov    %ecx,%ebp
  xor    %eax,%eax
  lea    (%r10,%r14,1),%r12
  nopl   0x0(%rax,%rax,1)
L49:
  mov    (%r12,%rax,4),%edx
  add    %edx,(%rbx,%rax,4)
  mov    %rax,%rdx
  add    $0x1,%rax
  cmp    %rbp,%rdx
  jne    L49
  mov    0x18(%rsp),%rdi
  xor    %edx,%edx
  mov    %rbx,%rsi
  mov    %r10,0x38(%rsp)
  mov    %r9d,0x34(%rsp)
  mov    %r8d,0x30(%rsp)
  mov    %r11,0x28(%rsp)
  mov    %ecx,0x20(%rsp)
  call   <var_check_1@plt>
  mov    0x20(%rsp),%ecx
  mov    0x28(%rsp),%r11
  test   %eax,%eax
  mov    0x30(%rsp),%r8d
  mov    0x34(%rsp),%r9d
  mov    0x38(%rsp),%r10
  jne    L432
  movl   $0x0,(%r11)
  xor    %eax,%eax
  nopl   0x0(%rax,%rax,1)
L186:
  mov    (%r12,%rax,4),%edx
  sub    %edx,(%rbx,%rax,4)
  mov    %rax,%rdx
  add    $0x1,%rax
  cmp    %rbp,%rdx
  jne    L186
  jmp    L432
L621:
  mov    0x18(%rsp),%rdi
  xor    %edx,%edx
  mov    %rbx,%rsi
  mov    %r10,0x38(%rsp)
  mov    %r9d,0x34(%rsp)
  mov    %r8d,0x30(%rsp)
  mov    %r11,0x28(%rsp)
  mov    %ecx,0x20(%rsp)
  call   <var_check_1@plt>
  mov    0x20(%rsp),%ecx
  mov    0x28(%rsp),%r11
  test   %eax,%eax
  mov    0x30(%rsp),%r8d
  mov    0x34(%rsp),%r9d
  mov    0x38(%rsp),%r10
  jne    L432
  movl   $0x0,(%r11)
L75:
  xor    %eax,%eax
L236:
  movdqu (%rbx,%rax,1),%xmm0
  movdqu (%r12,%rax,1),%xmm3
  psubd  %xmm3,%xmm0
  movups %xmm0,(%rbx,%rax,1)
  add    $0x10,%rax
  cmp    %rax,%r15
  jne    L236
  cmp    %r9d,%r13d
  je     L432
  mov    %r13d,%esi
  sub    %r9d,%esi
  cmp    $0x1,%esi
  je     L526
  mov    %r9d,%edx
  mov    %r9d,%eax
L562:
  add    $0x1,%rbp
  lea    (%rbx,%rdx,4),%rdi
  lea    (%r10,%r14,1),%r12
  imul   $0xfa,%rbp,%rbp
  movq   (%rdi),%xmm0
  add    %rdx,%rbp
  mov    %esi,%edx
  movq   (%r10,%rbp,4),%xmm1
  and    $0xfffffffe,%edx
  add    %edx,%eax
  psubd  %xmm1,%xmm0
  movq   %xmm0,(%rdi)
  cmp    %edx,%esi
  je     L432
L105:
  cltq
  shl    $0x2,%rax
  mov    (%r12,%rax,1),%edx
  sub    %edx,(%rbx,%rax,1)
  jmp    L432
  nopl   0x0(%rax,%rax,1)
L582:
  movl   $0x0,(%r11)
  cmp    $0x2,%ecx
  jbe    L340
  lea    (%r10,%r14,1),%r12
  jmp    L75
  nopl   0x0(%rax)
L143:
  test   %ebp,%ebp
  js     L475
  mov    0x10(%rsp),%rdi
  movslq %ebp,%rax
  lea    (%rdi,%rax,4),%rsi
  jmp    L149
  xchg   %ax,%ax
L603:
  sub    $0x1,%rax
  sub    $0x4,%rsi
  cmp    $0xffffffff,%eax
  je     L622
L149:
  mov    (%rsi),%r11d
  mov    %eax,%r8d
  test   %r11d,%r11d
  je     L603
  imul   $0x3e8,%rax,%rdi
  movl   $0x0,(%rsi)
  mov    %rbx,%rsi
  lea    0x4(%r10,%rdi,1),%r11
  sub    %r11,%rsi
  cmp    $0x8,%rsi
  jbe    L21
  cmp    $0x1,%r13d
  je     L21
  cmp    $0x2,%ecx
  jbe    L215
  lea    (%r10,%rdi,1),%rsi
  xor    %edx,%edx
  nopw   0x0(%rax,%rax,1)
L279:
  movdqu (%rbx,%rdx,1),%xmm0
  movdqu (%rsi,%rdx,1),%xmm5
  psubd  %xmm5,%xmm0
  movups %xmm0,(%rbx,%rdx,1)
  add    $0x10,%rdx
  cmp    %rdx,%r15
  jne    L279
  cmp    %r9d,%r13d
  je     L432
  mov    %r13d,%r11d
  sub    %r9d,%r11d
  cmp    $0x1,%r11d
  je     L358
  mov    %r9d,%edx
  mov    %r9d,%esi
L505:
  imul   $0xfa,%rax,%rax
  lea    (%rbx,%rsi,4),%rbp
  movq   0x0(%rbp),%xmm0
  add    %rsi,%rax
  mov    %r11d,%esi
  movq   (%r10,%rax,4),%xmm1
  and    $0xfffffffe,%esi
  lea    (%rsi,%rdx,1),%eax
  psubd  %xmm1,%xmm0
  movq   %xmm0,0x0(%rbp)
  cmp    %r11d,%esi
  je     L432
  lea    (%r10,%rdi,1),%rsi
L333:
  cltq
  shl    $0x2,%rax
  mov    (%rsi,%rax,1),%edx
  sub    %edx,(%rbx,%rax,1)
  jmp    L432
  nopl   0x0(%rax,%rax,1)
L471:
  mov    0x18(%rsp),%rdi
  xor    %edx,%edx
  mov    %rbx,%rsi
  mov    %r10,0x38(%rsp)
  mov    %r9d,0x34(%rsp)
  mov    %r8d,0x30(%rsp)
  mov    %r11,0x28(%rsp)
  mov    %ecx,0x20(%rsp)
  call   <var_check_1@plt>
  mov    0x20(%rsp),%ecx
  mov    0x28(%rsp),%r11
  test   %eax,%eax
  mov    0x30(%rsp),%r8d
  mov    0x34(%rsp),%r9d
  mov    0x38(%rsp),%r10
  jne    L432
  movl   $0x0,(%r11)
  jmp    L432
  nopl   0x0(%rax,%rax,1)
L521:
  cltq
  lea    (%r8,%rax,4),%rdx
  mov    %eax,%ebp
  test   %eax,%eax
  jns    L200
  jmp    L89
  xchg   %ax,%ax
L381:
  lea    -0x1(%rax),%ebp
  sub    $0x1,%rax
  sub    $0x4,%rdx
  cmp    $0xffffffff,%eax
  je     L394
L200:
  mov    (%rdx),%ecx
  mov    %eax,%ebp
  test   %ecx,%ecx
  je     L381
L89:
  movl   $0x0,(%rdx)
  imul   $0x3e8,%rax,%r8
  test   %r13d,%r13d
  jle    L226
  lea    0x4(%r10,%r8,1),%rcx
  mov    %rbx,%rdx
  sub    %rcx,%rdx
  cmp    $0x8,%rdx
  jbe    L408
  cmp    $0x1,%r13d
  je     L408
  lea    -0x1(%r13),%ecx
  mov    %r13d,%edx
  cmp    $0x2,%ecx
  jbe    L30
  mov    %r13d,%esi
  lea    (%r10,%r8,1),%rdi
  xor    %edx,%edx
  shr    $0x2,%esi
  shl    $0x4,%rsi
  nopl   0x0(%rax)
L121:
  movdqu (%rbx,%rdx,1),%xmm0
  movdqu (%rdi,%rdx,1),%xmm4
  psubd  %xmm4,%xmm0
  movups %xmm0,(%rbx,%rdx,1)
  add    $0x10,%rdx
  cmp    %rsi,%rdx
  jne    L121
  mov    %r13d,%r9d
  and    $0xfffffffc,%r9d
  mov    %r9d,%esi
  cmp    %r9d,%r13d
  je     L371
  mov    %r13d,%edx
  sub    %r9d,%edx
  cmp    $0x1,%edx
  je     L451
L116:
  imul   $0xfa,%rax,%rax
  lea    (%rbx,%r9,4),%rdi
  movq   (%rdi),%xmm0
  add    %r9,%rax
  movq   (%r10,%rax,4),%xmm1
  mov    %edx,%eax
  and    $0xfffffffe,%eax
  psubd  %xmm1,%xmm0
  add    %eax,%esi
  movq   %xmm0,(%rdi)
  cmp    %eax,%edx
  je     L371
  lea    (%r10,%r8,1),%rdi
L451:
  movslq %esi,%rax
  shl    $0x2,%rax
  mov    (%rdi,%rax,1),%edx
  sub    %edx,(%rbx,%rax,1)
  jmp    L371
L210:
  mov    %r13d,%edi
  xor    %esi,%esi
  xor    %eax,%eax
  jmp    L363
L635:
  mov    %r9d,%eax
  jmp    L378
L394:
  mov    0x10(%rsp),%rcx
  movslq %ebp,%rax
  lea    (%rcx,%rax,4),%rdx
  jmp    L89
L340:
  mov    %r13d,%esi
  xor    %edx,%edx
  jmp    L562
L408:
  movslq %r13d,%rcx
  xor    %eax,%eax
  lea    (%r10,%r8,1),%rdi
  xchg   %ax,%ax
L383:
  mov    (%rdi,%rax,4),%edx
  sub    %edx,(%rbx,%rax,4)
  add    $0x1,%rax
  cmp    %rcx,%rax
  jne    L383
  jmp    L226
L526:
  mov    %r9d,%eax
  jmp    L105
L21:
  mov    %ecx,%r11d
  xor    %eax,%eax
  lea    (%r10,%rdi,1),%rsi
L17:
  mov    (%rsi,%rax,4),%edx
  sub    %edx,(%rbx,%rax,4)
  mov    %rax,%rdx
  add    $0x1,%rax
  cmp    %r11,%rdx
  jne    L17
  jmp    L432
L215:
  mov    %r13d,%r11d
  xor    %esi,%esi
  jmp    L505
L475:
  xor    %r11d,%r11d
  jmp    L622
L30:
  xor    %r9d,%r9d
  jmp    L116
L358:
  mov    %r9d,%eax
  jmp    L333
```

assistant: ```c
int next_combo_b(int length, int basis[100][250], int num_basis, int constraints[250], int combo[100], int sum[250], int start_flag) {
  int go, pos, i, success;
  if (start_flag) {
    for (i = 0; i < length; i++)
      sum[i] = 0;
    for (i = 0; i < num_basis; i++)
      combo[i] = 0;
    pos = -1;
  } else {
    pos = num_basis - 1;
    while (pos >= 0 && !combo[pos])
      pos--;
    combo[pos] = 0;
    {
      int j, *p;
      for (j = 0, p = basis[pos]; j < length; j++)
        sum[j] -= p[j];
    };
  }
  success = 0;
  go = 1;
  while (go && !success) {
    if (pos == num_basis - 1) {
      success = 1;
      for (i = 0; i < length && success; i++)
        if (sum[i] == 0)
          success = 0;
      if (!success) {
        while (pos >= 0 && !combo[pos])
          pos--;
        if (pos < 0)
          go = 0;
        else {
          combo[pos] = 0;
          {
            int j, *p;
            for (j = 0, p = basis[pos]; j < length; j++)
              sum[j] -= p[j];
          };
        }
      }
    } else {
      pos++;
      combo[pos] = 1;
      {
        int j, *p;
        for (j = 0, p = basis[pos]; j < length; j++)
          sum[j] += p[j];
      };
      if (!var_check_1(constraints, sum, 0, length - 1)) {
        combo[pos] = 0;
        {
          int j, *p;
          for (j = 0, p = basis[pos]; j < length; j++)
            sum[j] -= p[j];
        };
      }
    }
  }
  return success;
}
```