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

```asm
<square_matrix_multiply>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x98,%rsp
  mov    %rdi,0x78(%rsp)
  mov    %rsi,0x80(%rsp)
  mov    %edx,0x2c(%rsp)
  mov    %rcx,0x88(%rsp)
  cmp    $0x1,%edx
  jne    L185
  mov    (%rdi),%eax
  imul   (%rsi),%eax
  mov    %eax,(%rcx)
L13:
  add    $0x98,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L185:
  mov    0x2c(%rsp),%r14d
  mov    %r14d,%ebx
  imul   %r14d,%ebx
  mov    %ebx,%edi
  call   <malloc@plt>
  mov    %rax,0x58(%rsp)
  mov    %ebx,%edi
  call   <malloc@plt>
  mov    %rax,0x30(%rsp)
  mov    %ebx,%edi
  call   <malloc@plt>
  mov    %rax,0x60(%rsp)
  mov    %ebx,%edi
  call   <malloc@plt>
  mov    %rax,0x38(%rsp)
  mov    %ebx,%edi
  call   <malloc@plt>
  mov    %rax,0x68(%rsp)
  mov    %ebx,%edi
  call   <malloc@plt>
  mov    %rax,0x40(%rsp)
  mov    %ebx,%edi
  call   <malloc@plt>
  mov    %rax,0x70(%rsp)
  mov    %ebx,%edi
  call   <malloc@plt>
  mov    %rax,0x48(%rsp)
  test   %r14d,%r14d
  jle    L81
  mov    %r14d,%eax
  shr    $0x1f,%eax
  add    %r14d,%eax
  sar    %eax
  mov    %eax,%r15d
  mov    %r14d,%eax
  imul   %r15d,%eax
  neg    %eax
  mov    %eax,0x50(%rsp)
  mov    $0x0,%r12d
  mov    $0x0,%ebp
  sub    %r15d,%r14d
  jmp    L295
L181:
  mov    (%r10,%rax,4),%ecx
  mov    %ecx,0x0(%r13,%rax,4)
  mov    (%rdi,%rax,4),%ecx
  mov    0x20(%rsp),%r11
  mov    %ecx,(%r11,%rax,4)
  test   %r9b,%r9b
  je     L276
  test   %r8b,%r8b
  je     L276
  mov    $0x0,%ecx
  jmp    L188
L208:
  movslq %edx,%rcx
  add    0x8(%rsp),%rcx
  mov    (%r10,%rax,4),%r8d
  mov    0x30(%rsp),%rbp
  mov    %r8d,0x0(%rbp,%rcx,4)
  mov    (%rdi,%rax,4),%r8d
  mov    0x40(%rsp),%rbp
  mov    %r8d,0x0(%rbp,%rcx,4)
  mov    %r11d,%ecx
  mov    %r9d,%r8d
  jmp    L121
L217:
  mov    %r9d,%r8d
L121:
  test   %r8b,%r8b
  je     L276
  test   %cl,%cl
  jne    L317
L276:
  add    $0x1,%rax
  add    $0x1,%edx
  cmp    %r14d,%edx
  je     L50
L284:
  mov    %eax,%ecx
  cmp    %eax,%r15d
  setg   %r8b
  jle    L29
  test   %sil,%sil
  jne    L181
L29:
  cmp    %ecx,%r15d
  setle  %cl
  mov    %esi,%r11d
  and    %cl,%r11b
  jne    L208
  test   %r9b,%r9b
  je     L217
  test   %r8b,%r8b
  je     L217
L188:
  mov    (%r10,%rax,4),%r8d
  mov    0x18(%rsp),%r11
  mov    %r8d,(%r11,%rax,4)
  mov    (%rdi,%rax,4),%r8d
  mov    %r8d,(%rbx,%rax,4)
  mov    $0x1,%r8d
  jmp    L121
L317:
  movslq %edx,%rcx
  add    0x10(%rsp),%rcx
  mov    (%r10,%rax,4),%r8d
  mov    0x38(%rsp),%r11
  mov    %r8d,(%r11,%rcx,4)
  mov    (%rdi,%rax,4),%r8d
  mov    0x48(%rsp),%r11
  mov    %r8d,(%r11,%rcx,4)
  jmp    L276
L50:
  mov    0x54(%rsp),%ebp
  add    $0x1,%ebp
  mov    0x2c(%rsp),%eax
  add    %eax,%r12d
  add    %eax,0x50(%rsp)
  cmp    %ebp,%eax
  je     L81
L295:
  cmp    %ebp,%r15d
  setg   %sil
  mov    %r12d,%eax
  shr    $0x1f,%eax
  add    %r12d,%eax
  sar    %eax
  movslq %eax,%rcx
  mov    %rcx,0x8(%rsp)
  cmp    %ebp,%r15d
  setle  %r9b
  mov    0x50(%rsp),%ebx
  mov    %ebx,%eax
  shr    $0x1f,%eax
  add    %ebx,%eax
  sar    %eax
  movslq %eax,%rbx
  mov    %rbx,0x10(%rsp)
  mov    %r15d,%edx
  neg    %edx
  movslq %r12d,%rdi
  shl    $0x2,%rdi
  mov    0x78(%rsp),%rax
  lea    (%rax,%rdi,1),%r10
  add    0x80(%rsp),%rdi
  lea    0x0(,%rcx,4),%rax
  mov    0x58(%rsp),%rcx
  lea    (%rcx,%rax,1),%r13
  add    0x68(%rsp),%rax
  mov    %rax,0x20(%rsp)
  shl    $0x2,%rbx
  mov    0x60(%rsp),%rax
  add    %rbx,%rax
  mov    %rax,0x18(%rsp)
  add    0x70(%rsp),%rbx
  mov    $0x0,%eax
  mov    %ebp,0x54(%rsp)
  jmp    L284
L81:
  mov    0x2c(%rsp),%r15d
  mov    %r15d,%ebx
  shr    $0x1f,%ebx
  add    %r15d,%ebx
  sar    %ebx
  mov    %ebx,%r14d
  imul   %ebx,%r14d
  shl    $0x2,%r14d
  mov    %r14d,%edi
  call   <malloc@plt>
  mov    %rax,%r12
  mov    %r14d,%edi
  call   <malloc@plt>
  mov    %rax,%rbp
  mov    %r14d,%edi
  call   <malloc@plt>
  mov    %rax,%r13
  mov    %rax,0x20(%rsp)
  mov    %r12,%rcx
  mov    %ebx,%edx
  mov    0x68(%rsp),%rsi
  mov    0x58(%rsp),%rdi
  call   <square_matrix_multiply>
  mov    %rbp,%rcx
  mov    %ebx,%edx
  mov    0x70(%rsp),%rsi
  mov    0x30(%rsp),%rdi
  call   <square_matrix_multiply>
  mov    %ebx,%ecx
  mov    %r13,%rdx
  mov    %rbp,%rsi
  mov    %r12,%rdi
  call   <square_matrix_add@plt>
  mov    %r14d,%edi
  call   <malloc@plt>
  mov    %rax,%r13
  mov    %r14d,%edi
  call   <malloc@plt>
  mov    %rax,%r12
  mov    %r14d,%edi
  call   <malloc@plt>
  mov    %rax,%rbp
  mov    %r13,%rcx
  mov    %ebx,%edx
  mov    0x40(%rsp),%rsi
  mov    0x58(%rsp),%rdi
  call   <square_matrix_multiply>
  mov    %r12,%rcx
  mov    %ebx,%edx
  mov    0x48(%rsp),%rsi
  mov    0x30(%rsp),%rdi
  call   <square_matrix_multiply>
  mov    %ebx,%ecx
  mov    %rbp,%rdx
  mov    %r12,%rsi
  mov    %r13,%rdi
  call   <square_matrix_add@plt>
  mov    %r14d,%edi
  call   <malloc@plt>
  mov    %rax,%r12
  mov    %r14d,%edi
  call   <malloc@plt>
  mov    %rax,%r13
  mov    %r14d,%edi
  call   <malloc@plt>
  mov    %rax,0x10(%rsp)
  mov    %r12,%rcx
  mov    %ebx,%edx
  mov    0x68(%rsp),%rsi
  mov    0x60(%rsp),%rdi
  call   <square_matrix_multiply>
  mov    %r13,%rcx
  mov    %ebx,%edx
  mov    0x70(%rsp),%rsi
  mov    0x38(%rsp),%rdi
  call   <square_matrix_multiply>
  mov    %ebx,%ecx
  mov    0x10(%rsp),%rdx
  mov    %r13,%rsi
  mov    %r12,%rdi
  call   <square_matrix_add@plt>
  mov    %r14d,%edi
  call   <malloc@plt>
  mov    %rax,%r12
  mov    %r14d,%edi
  call   <malloc@plt>
  mov    %rax,%r13
  mov    %r14d,%edi
  call   <malloc@plt>
  mov    %rax,%r14
  mov    %rax,0x18(%rsp)
  mov    %r12,%rcx
  mov    %ebx,%edx
  mov    0x40(%rsp),%rsi
  mov    0x60(%rsp),%rdi
  call   <square_matrix_multiply>
  mov    %r13,%rcx
  mov    %ebx,%edx
  mov    0x48(%rsp),%rsi
  mov    0x38(%rsp),%rdi
  call   <square_matrix_multiply>
  mov    %ebx,%ecx
  mov    %r14,%rdx
  mov    %r13,%rsi
  mov    %r12,%rdi
  call   <square_matrix_add@plt>
  test   %r15d,%r15d
  jle    L13
  mov    %r15d,%eax
  imul   %ebx,%eax
  neg    %eax
  mov    %eax,0x8(%rsp)
  mov    $0x0,%r13d
  mov    $0x0,%r8d
  sub    %ebx,%r15d
  mov    %r15d,%r12d
  jmp    L199
L299:
  cmp    %edi,%ebx
  setle  %dil
  test   %sil,%sil
  je     L160
  test   %dil,%dil
  je     L160
  movslq %edx,%rcx
  add    %r9,%rcx
  mov    0x0(%rbp,%rcx,4),%ecx
  mov    %ecx,(%r10,%rax,4)
L165:
  add    $0x1,%rax
  add    $0x1,%edx
  cmp    %r12d,%edx
  je     L189
L118:
  mov    %eax,%edi
  cmp    %eax,%ebx
  setg   %cl
  cmp    %r8d,%ebx
  setg   %sil
  test   %cl,%cl
  je     L299
  test   %sil,%sil
  je     L299
  mov    (%r14,%rax,4),%ecx
  mov    %ecx,(%r10,%rax,4)
  cmp    %r8d,%ebx
  setle  %sil
  mov    $0x0,%edi
L140:
  test   %dil,%dil
  je     L165
  test   %sil,%sil
  je     L165
  movslq %edx,%rcx
  add    %r11,%rcx
  mov    0x18(%rsp),%rdi
  mov    (%rdi,%rcx,4),%ecx
  mov    %ecx,(%r10,%rax,4)
  jmp    L165
L160:
  cmp    %r8d,%ebx
  setle  %sil
  and    %sil,%cl
  je     L140
  mov    (%r15,%rax,4),%esi
  mov    %esi,(%r10,%rax,4)
  mov    %ecx,%esi
  jmp    L140
L189:
  add    $0x1,%r8d
  mov    0x2c(%rsp),%eax
  add    %eax,%r13d
  add    %eax,0x8(%rsp)
  cmp    %r8d,%eax
  je     L13
L199:
  mov    %r13d,%r9d
  shr    $0x1f,%r9d
  add    %r13d,%r9d
  sar    %r9d
  movslq %r9d,%r9
  mov    0x8(%rsp),%eax
  mov    %eax,%r11d
  shr    $0x1f,%r11d
  add    %eax,%r11d
  sar    %r11d
  movslq %r11d,%r11
  mov    %ebx,%edx
  neg    %edx
  movslq %r13d,%rax
  mov    0x88(%rsp),%rdi
  lea    (%rdi,%rax,4),%r10
  mov    0x20(%rsp),%rax
  lea    (%rax,%r9,4),%r14
  mov    0x10(%rsp),%rax
  lea    (%rax,%r11,4),%r15
  mov    $0x0,%eax
  jmp    L118
```

assistant: ```c
void square_matrix_multiply(int *a1, int *b1, int num, int *c) {
  int n = num, i, j;
  int *a11, *a12, *a21, *a22;
  int *b11, *b12, *b21, *b22;
  int *c11, *c12, *c21, *c22;
  int *c11a, *c11b, *c12a, *c12b, *c21a, *c21b, *c22a, *c22b;
  if (n == 1)
    *c = *a1 * *b1;
  else {
    a11 = malloc(sizeof(int) * num * num / 4);
    a12 = malloc(sizeof(int) * num * num / 4);
    a21 = malloc(sizeof(int) * num * num / 4);
    a22 = malloc(sizeof(int) * num * num / 4);
    b11 = malloc(sizeof(int) * num * num / 4);
    b12 = malloc(sizeof(int) * num * num / 4);
    b21 = malloc(sizeof(int) * num * num / 4);
    b22 = malloc(sizeof(int) * num * num / 4);
    for (i = 0; i < num; i++) {
      for (j = 0; j < num; j++) {
        if (i + 1 <= num / 2 && j + 1 <= num / 2) {
          *(a11 + i * num / 2 + j) = *(a1 + i * num + j);
          *(b11 + i * num / 2 + j) = *(b1 + i * num + j);
        }
        if (i + 1 <= num / 2 && j + 1 > num / 2) {
          *(a12 + i * num / 2 + (j - num / 2)) = *(a1 + i * num + j);
          *(b12 + i * num / 2 + (j - num / 2)) = *(b1 + i * num + j);
        }
        if (i + 1 > num / 2 && j + 1 <= num / 2) {
          *(a21 + (i - num / 2) * num / 2 + j) = *(a1 + i * num + j);
          *(b21 + (i - num / 2) * num / 2 + j) = *(b1 + i * num + j);
        }
        if (i + 1 > num / 2 && j + 1 > num / 2) {
          *(a22 + (i - num / 2) * num / 2 + (j - num / 2)) = *(a1 + i * num + j);
          *(b22 + (i - num / 2) * num / 2 + (j - num / 2)) = *(b1 + i * num + j);
        }
      }
    }
    c11a = malloc(sizeof(int) * (num / 2) * (num / 2));
    c11b = malloc(sizeof(int) * (num / 2) * (num / 2));
    c11 = malloc(sizeof(int) * (num / 2) * (num / 2));
    square_matrix_multiply(a11, b11, num / 2, c11a);
    square_matrix_multiply(a12, b21, num / 2, c11b);
    square_matrix_add(c11a, c11b, c11, num / 2);
    c12a = malloc(sizeof(int) * (num / 2) * (num / 2));
    c12b = malloc(sizeof(int) * (num / 2) * (num / 2));
    c12 = malloc(sizeof(int) * (num / 2) * (num / 2));
    square_matrix_multiply(a11, b12, num / 2, c12a);
    square_matrix_multiply(a12, b22, num / 2, c12b);
    square_matrix_add(c12a, c12b, c12, num / 2);
    c21a = malloc(sizeof(int) * (num / 2) * (num / 2));
    c21b = malloc(sizeof(int) * (num / 2) * (num / 2));
    c21 = malloc(sizeof(int) * (num / 2) * (num / 2));
    square_matrix_multiply(a21, b11, num / 2, c21a);
    square_matrix_multiply(a22, b21, num / 2, c21b);
    square_matrix_add(c21a, c21b, c21, num / 2);
    c22a = malloc(sizeof(int) * (num / 2) * (num / 2));
    c22b = malloc(sizeof(int) * (num / 2) * (num / 2));
    c22 = malloc(sizeof(int) * (num / 2) * (num / 2));
    square_matrix_multiply(a21, b12, num / 2, c22a);
    square_matrix_multiply(a22, b22, num / 2, c22b);
    square_matrix_add(c22a, c22b, c22, num / 2);
    for (i = 0; i < num; i++)
      for (j = 0; j < num; j++) {
        if (i + 1 <= num / 2 && j + 1 <= num / 2)
          *(c + i * num + j) = *(c11 + i * num / 2 + j);
        if (i + 1 <= num / 2 && j + 1 > num / 2)
          *(c + i * num + j) = *(c12 + i * num / 2 + (j - num / 2));
        if (i + 1 > num / 2 && j + 1 <= num / 2)
          *(c + i * num + j) = *(c21 + (i - num / 2) * num / 2 + j);
        if (i + 1 > num / 2 && j + 1 > num / 2)
          *(c + i * num + j) = *(c22 + (i - num / 2) * num / 2 + (j - num / 2));
      }
  }
}
```