user: What would the C source look like for the assembly code provided here:

```asm
<rmsub_stride>:
  endbr64
  push   %r15
  lea    (%rcx,%r8,1),%eax
  mov    %ecx,%r15d
  push   %r14
  add    %r9d,%eax
  push   %r13
  mov    %r8d,%r13d
  push   %r12
  mov    %rdx,%r12
  push   %rbp
  mov    %rsi,%rbp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x28,%rsp
  cmp    $0xc0,%eax
  jle    L36
  mov    %rsi,0x8(%rsp)
  mov    %rdi,%rbp
  mov    %r9d,%ebx
L43:
  mov    %r15d,%eax
  sub    $0x8,%rsp
  mov    %r12,%rdx
  mov    %rbp,%rdi
  shr    $0x1f,%eax
  add    %r15d,%eax
  sar    %eax
  mov    %eax,%r15d
  mov    %r13d,%eax
  shr    $0x1f,%eax
  mov    %r15d,%ecx
  add    %r13d,%eax
  sar    %eax
  mov    %eax,%r13d
  mov    %ebx,%eax
  shr    $0x1f,%eax
  mov    %r13d,%r8d
  add    %ebx,%eax
  sar    %eax
  mov    %eax,%ebx
  mov    0x78(%rsp),%eax
  mov    %ebx,%r9d
  push   %rax
  mov    0x78(%rsp),%eax
  push   %rax
  mov    0x78(%rsp),%eax
  push   %rax
  mov    0x28(%rsp),%r14
  mov    %r14,%rsi
  call   <rmsub_stride>
  movslq %r13d,%rax
  mov    %ebx,%r9d
  mov    %r13d,%r8d
  mov    %rax,0x38(%rsp)
  lea    0x0(,%rax,4),%rdi
  add    $0x18,%rsp
  mov    0x78(%rsp),%eax
  lea    (%r12,%rdi,1),%rdx
  lea    (%r14,%rdi,1),%rsi
  mov    %r15d,%ecx
  add    %rbp,%rdi
  mov    %r14,0x10(%rsp)
  push   %rax
  mov    0x78(%rsp),%eax
  push   %rax
  mov    0x78(%rsp),%eax
  push   %rax
  call   <rmsub_stride>
  mov    %ebx,%r9d
  mov    %r13d,%r8d
  mov    %r15d,%ecx
  mov    0x90(%rsp),%eax
  mov    0x88(%rsp),%r11d
  add    $0x18,%rsp
  imul   %r15d,%eax
  imul   %r15d,%r11d
  movslq %eax,%r14
  mov    0x78(%rsp),%eax
  movslq %r11d,%r11
  lea    0x0(,%r14,4),%rsi
  mov    %r11,0x18(%rsp)
  lea    (%r12,%rsi,1),%rdx
  add    0x10(%rsp),%rsi
  lea    0x0(%rbp,%r11,4),%rdi
  push   %rax
  mov    0x78(%rsp),%eax
  push   %rax
  mov    0x78(%rsp),%eax
  push   %rax
  call   <rmsub_stride>
  mov    0x38(%rsp),%rax
  mov    0x30(%rsp),%r11
  add    %rax,%r14
  add    %r11,%rax
  lea    0x0(%rbp,%rax,4),%rbp
  lea    (%r15,%r13,1),%eax
  shl    $0x2,%r14
  add    %r14,0x28(%rsp)
  add    %ebx,%eax
  add    %r14,%r12
  add    $0x20,%rsp
  cmp    $0xc0,%eax
  jg     L43
  mov    %rbp,%rbx
  mov    0x8(%rsp),%rbp
L36:
  test   %r15d,%r15d
  jle    L47
  movslq 0x60(%rsp),%rdi
  movslq 0x68(%rsp),%r10
  xor    %esi,%esi
  movslq %r13d,%rdx
  movslq 0x70(%rsp),%r9
  shl    $0x2,%rdi
  shl    $0x2,%r10
  shl    $0x2,%r9
  nopl   0x0(%rax)
L14:
  test   %r13d,%r13d
  jle    L10
  xor    %eax,%eax
  nop
L8:
  movss  (%rbx,%rax,4),%xmm0
  subss  0x0(%rbp,%rax,4),%xmm0
  movss  %xmm0,(%r12,%rax,4)
  add    $0x1,%rax
  cmp    %rdx,%rax
  jne    L8
L10:
  add    $0x1,%esi
  add    %rdi,%rbx
  add    %r10,%rbp
  add    %r9,%r12
  cmp    %r15d,%esi
  jne    L14
L47:
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void rmsub_stride(float *A, float *B, float *C, int rows, int cols, int p, int sA, int sB, int sC) {
  int i, j, u, v, w;
  if (rows + cols + p <= 192) {
    for (i = 0; i < rows; ++i) {
      u = i * sC;
      v = i * sA;
      w = i * sB;
      for (j = 0; j < cols; j++) {
        C[j + u] = A[j + v] - B[j + w];
      }
    }
  } else {
    rows /= 2;
    cols /= 2;
    p /= 2;
    rmsub_stride(A, B, C, rows, cols, p, sA, sB, sC);
    rmsub_stride(A + cols, B + cols, C + cols, rows, cols, p, sA, sB, sC);
    rmsub_stride(A + rows * sB, B + rows * sC, C + rows * sC, rows, cols, p, sA, sB, sC);
    rmsub_stride(A + rows * sB + cols, B + rows * sC + cols, C + rows * sC + cols, rows, cols, p, sA, sB, sC);
  }
}
```