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

```asm
<msub_stride>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %ecx,-0x4c(%rsp)
  mov    %r8d,-0x50(%rsp)
  mov    %r9d,-0x20(%rsp)
  test   %ecx,%ecx
  jle    L117
  mov    %r8d,%ecx
  mov    %r8d,%eax
  test   %r8d,%r8d
  jle    L117
  movslq %r9d,%rbx
  shr    $0x2,%eax
  movl   $0x0,-0x54(%rsp)
  xor    %ebp,%ebp
  mov    %rbx,-0x38(%rsp)
  shl    $0x2,%rbx
  mov    %rdi,%r10
  xor    %r12d,%r12d
  mov    %rbx,-0x30(%rsp)
  movslq 0x38(%rsp),%rbx
  mov    %rdx,%rdi
  xor    %r13d,%r13d
  mov    %r10,%rdx
  xor    %r11d,%r11d
  xor    %r9d,%r9d
  mov    %rbx,-0x48(%rsp)
  movslq 0x40(%rsp),%rbx
  mov    %rbx,-0x40(%rsp)
  lea    -0x1(%r8),%ebx
  mov    %ebx,-0x1c(%rsp)
  lea    -0x1(%rax),%ebx
  mov    %r8d,%eax
  xor    %r8d,%r8d
  and    $0xfffffffc,%eax
  add    $0x1,%rbx
  mov    %eax,-0x18(%rsp)
  mov    %ecx,%eax
  and    $0x3,%ecx
  shl    $0x4,%rbx
  mov    %rax,-0x10(%rsp)
  lea    0x4(%rsi),%rax
  mov    %rax,-0x28(%rsp)
  mov    %ecx,-0x14(%rsp)
  nopl   0x0(%rax)
L52:
  lea    (%rdi,%r12,4),%rcx
  lea    0x4(%rdx),%r15
  mov    %rcx,%r14
  lea    0x0(,%rbp,4),%rax
  sub    %r15,%r14
  cmp    $0x8,%r14
  seta   %r15b
  cmpl   $0x1,-0x50(%rsp)
  setne  %r14b
  test   %r14b,%r15b
  je     L55
  mov    -0x28(%rsp),%r15
  mov    %rcx,%r14
  add    %rax,%r15
  sub    %r15,%r14
  cmp    $0x8,%r14
  jbe    L55
  cmpl   $0x2,-0x1c(%rsp)
  jbe    L36
  add    %rsi,%rax
  xor    %r14d,%r14d
  nopl   0x0(%rax)
L80:
  movups (%rdx,%r14,1),%xmm0
  movups (%rax,%r14,1),%xmm2
  subps  %xmm2,%xmm0
  movups %xmm0,(%rcx,%r14,1)
  add    $0x10,%r14
  cmp    %r14,%rbx
  jne    L80
  mov    -0x18(%rsp),%eax
  cmp    %eax,-0x50(%rsp)
  je     L21
  mov    -0x14(%rsp),%ecx
  mov    %ecx,%r14d
  cmp    $0x1,%ecx
  je     L97
  mov    %eax,%ecx
L64:
  lea    0x0(%r13,%rcx,1),%r15
  movq   (%r10,%r15,4),%xmm0
  lea    0x0(%rbp,%rcx,1),%r15
  add    %r12,%rcx
  movq   (%rsi,%r15,4),%xmm1
  subps  %xmm1,%xmm0
  movlps %xmm0,(%rdi,%rcx,4)
  mov    %r14d,%ecx
  and    $0xfffffffe,%ecx
  add    %ecx,%eax
  cmp    %ecx,%r14d
  je     L21
L97:
  lea    (%r11,%rax,1),%ecx
  lea    (%r8,%rax,1),%r14d
  add    %r9d,%eax
  movslq %r14d,%r14
  cltq
  movslq %ecx,%rcx
  movss  (%r10,%r14,4),%xmm0
  subss  (%rsi,%rax,4),%xmm0
  movss  %xmm0,(%rdi,%rcx,4)
L21:
  addl   $0x1,-0x54(%rsp)
  add    -0x30(%rsp),%rdx
  mov    -0x54(%rsp),%eax
  add    -0x20(%rsp),%r8d
  add    0x38(%rsp),%r9d
  add    0x40(%rsp),%r11d
  add    -0x38(%rsp),%r13
  add    -0x48(%rsp),%rbp
  add    -0x40(%rsp),%r12
  cmp    %eax,-0x4c(%rsp)
  jne    L52
L117:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L55:
  mov    -0x10(%rsp),%r15
  add    %rsi,%rax
  xor    %r14d,%r14d
  nopl   0x0(%rax,%rax,1)
L75:
  movss  (%rdx,%r14,4),%xmm0
  subss  (%rax,%r14,4),%xmm0
  movss  %xmm0,(%rcx,%r14,4)
  add    $0x1,%r14
  cmp    %r15,%r14
  jne    L75
  jmp    L21
L36:
  mov    -0x50(%rsp),%r14d
  xor    %ecx,%ecx
  xor    %eax,%eax
  jmp    L64
```

assistant: ```c
void msub_stride(float *A, float *B, float *C, int rows, int cols, int sA, int sB, int sC) {
  int i, j, u, v, w;
  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];
    }
  }
}
```