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

```asm
<horn_dy>:
  endbr64
  push   %r15
  mov    %r8d,%eax
  push   %r14
  sub    $0x1,%eax
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdx,0x8(%rsp)
  mov    %ecx,0x14(%rsp)
  mov    %r8d,0x54(%rsp)
  mov    %eax,0x2c(%rsp)
  test   %eax,%eax
  jle    L77
  lea    -0x1(%rcx),%ebx
  mov    %ebx,0x3c(%rsp)
  test   %ebx,%ebx
  jle    L77
  movslq %ecx,%rax
  movl   $0x0,0x28(%rsp)
  movapd D0(%rip),%xmm3
  xor    %r11d,%r11d
  shl    $0x2,%rax
  movl   $0x0,0x10(%rsp)
  movsd  D0(%rip),%xmm6
  lea    (%rax,%rdi,1),%rdx
  mov    %rax,0x30(%rsp)
  lea    (%rax,%rsi,1),%r15
  mov    %ebx,%eax
  shr    $0x2,%eax
  and    $0xfffffffc,%ebx
  mov    %rdx,0x18(%rsp)
  sub    $0x1,%eax
  mov    %ebx,0x48(%rsp)
  add    $0x1,%rax
  shl    $0x4,%rax
  mov    %rax,0x40(%rsp)
  lea    0x1(%rbx),%eax
  mov    %eax,0x4c(%rsp)
  lea    0x2(%rbx),%eax
  mov    $0x4,%ebx
  mov    %eax,0x50(%rsp)
  lea    -0x2(%rcx),%eax
  mov    %eax,0x38(%rsp)
  shl    $0x2,%rax
  mov    %rax,0x58(%rsp)
  nopl   0x0(%rax)
L84:
  mov    0x8(%rsp),%rax
  lea    (%rbx,%r15,1),%r8
  lea    (%rdi,%rbx,1),%r9
  lea    (%rsi,%rbx,1),%r10
  lea    (%rax,%r11,1),%rdx
  mov    0x18(%rsp),%rax
  lea    (%rax,%rbx,1),%rcx
  mov    %rdx,%rax
  sub    %r8,%rax
  cmp    $0xc,%rax
  mov    %rdx,%rax
  seta   %bpl
  sub    %rcx,%rax
  cmp    $0xc,%rax
  seta   %al
  and    %ebp,%eax
  cmpl   $0x2,0x38(%rsp)
  seta   %bpl
  and    %ebp,%eax
  mov    %rdx,%rbp
  sub    %r9,%rbp
  cmp    $0xc,%rbp
  seta   %bpl
  test   %bpl,%al
  je     L33
  mov    %rdx,%rax
  sub    %r10,%rax
  cmp    $0xc,%rax
  jbe    L33
  mov    0x18(%rsp),%rax
  mov    %rsi,0x20(%rsp)
  lea    (%rsi,%r11,1),%rbp
  lea    (%r11,%r15,1),%r13
  mov    0x40(%rsp),%rsi
  lea    (%rdi,%r11,1),%r12
  lea    (%rax,%r11,1),%r14
  xor    %eax,%eax
  xchg   %ax,%ax
L68:
  movups 0x0(%r13,%rax,1),%xmm7
  movups (%r14,%rax,1),%xmm2
  movups (%r12,%rax,1),%xmm1
  addps  %xmm7,%xmm2
  movups (%rcx,%rax,1),%xmm7
  addps  %xmm7,%xmm2
  movups (%r8,%rax,1),%xmm7
  addps  %xmm7,%xmm2
  movups 0x0(%rbp,%rax,1),%xmm7
  addps  %xmm7,%xmm1
  movups (%r9,%rax,1),%xmm7
  cvtps2pd %xmm2,%xmm0
  mulpd  %xmm3,%xmm0
  movhlps %xmm2,%xmm4
  cvtps2pd %xmm4,%xmm2
  mulpd  %xmm3,%xmm2
  addps  %xmm7,%xmm1
  movups (%r10,%rax,1),%xmm7
  addps  %xmm7,%xmm1
  cvtps2pd %xmm1,%xmm7
  mulpd  %xmm3,%xmm7
  movhlps %xmm1,%xmm5
  subpd  %xmm7,%xmm0
  cvtps2pd %xmm5,%xmm7
  mulpd  %xmm3,%xmm7
  cvtpd2ps %xmm0,%xmm0
  subpd  %xmm7,%xmm2
  cvtpd2ps %xmm2,%xmm1
  movlhps %xmm1,%xmm0
  movups %xmm0,(%rdx,%rax,1)
  add    $0x10,%rax
  cmp    %rax,%rsi
  jne    L68
  mov    0x3c(%rsp),%r14d
  mov    0x48(%rsp),%edx
  mov    0x20(%rsp),%rsi
  cmp    %edx,%r14d
  je     L54
  mov    0x28(%rsp),%ecx
  mov    0x14(%rsp),%r10d
  mov    0x8(%rsp),%r9
  mov    %ecx,%eax
  add    %edx,%eax
  lea    (%rax,%r10,1),%edx
  cltq
  movslq %edx,%rdx
  movss  (%rdi,%rax,4),%xmm1
  addss  (%rsi,%rax,4),%xmm1
  movss  (%rdi,%rdx,4),%xmm0
  addss  0x4(%rdi,%rax,4),%xmm1
  addss  (%rsi,%rdx,4),%xmm0
  addss  0x4(%rsi,%rax,4),%xmm1
  addss  0x4(%rdi,%rdx,4),%xmm0
  addss  0x4(%rsi,%rdx,4),%xmm0
  mov    0x4c(%rsp),%edx
  cvtss2sd %xmm1,%xmm1
  mulsd  %xmm6,%xmm1
  cvtss2sd %xmm0,%xmm0
  mulsd  %xmm6,%xmm0
  subsd  %xmm1,%xmm0
  cvtsd2ss %xmm0,%xmm0
  movss  %xmm0,(%r9,%rax,4)
  cmp    %edx,%r14d
  jle    L54
  mov    %ecx,%eax
  add    %edx,%eax
  lea    (%r10,%rax,1),%edx
  cltq
  movslq %edx,%rdx
  movss  (%rdi,%rax,4),%xmm1
  addss  (%rsi,%rax,4),%xmm1
  movss  (%rdi,%rdx,4),%xmm0
  addss  0x4(%rdi,%rax,4),%xmm1
  addss  (%rsi,%rdx,4),%xmm0
  addss  0x4(%rsi,%rax,4),%xmm1
  addss  0x4(%rdi,%rdx,4),%xmm0
  addss  0x4(%rsi,%rdx,4),%xmm0
  mov    0x50(%rsp),%edx
  cvtss2sd %xmm1,%xmm1
  mulsd  %xmm6,%xmm1
  cvtss2sd %xmm0,%xmm0
  mulsd  %xmm6,%xmm0
  subsd  %xmm1,%xmm0
  cvtsd2ss %xmm0,%xmm0
  movss  %xmm0,(%r9,%rax,4)
  cmp    %edx,%r14d
  jle    L54
  mov    %ecx,%eax
  add    %edx,%eax
  lea    (%r10,%rax,1),%edx
  cltq
  movslq %edx,%rdx
  movss  (%rsi,%rax,4),%xmm1
  addss  (%rdi,%rax,4),%xmm1
  movss  (%rsi,%rdx,4),%xmm0
  addss  0x4(%rdi,%rax,4),%xmm1
  addss  (%rdi,%rdx,4),%xmm0
  addss  0x4(%rsi,%rax,4),%xmm1
  addss  0x4(%rdi,%rdx,4),%xmm0
  addss  0x4(%rsi,%rdx,4),%xmm0
  cvtss2sd %xmm1,%xmm1
  mulsd  %xmm6,%xmm1
  cvtss2sd %xmm0,%xmm0
  mulsd  %xmm6,%xmm0
  subsd  %xmm1,%xmm0
  cvtsd2ss %xmm0,%xmm0
  movss  %xmm0,(%r9,%rax,4)
L54:
  mov    0x30(%rsp),%rdx
  addl   $0x1,0x10(%rsp)
  mov    0x14(%rsp),%r8d
  mov    0x10(%rsp),%eax
  add    %r8d,0x28(%rsp)
  add    %rdx,%r11
  add    %rdx,%rbx
  cmp    0x2c(%rsp),%eax
  jne    L84
L77:
  mov    0x14(%rsp),%edx
  test   %edx,%edx
  jle    L69
  movslq 0x14(%rsp),%rdx
  mov    0x2c(%rsp),%eax
  xor    %esi,%esi
  mov    %rdx,%rbx
  shl    $0x2,%rdx
  imul   %ebx,%eax
  mov    0x8(%rsp),%rbx
  cltq
  lea    (%rbx,%rax,4),%rdi
  call   <memset@plt>
L69:
  mov    0x54(%rsp),%eax
  test   %eax,%eax
  jle    L2
  cmpl   $0x1,0x14(%rsp)
  jne    L27
  movslq 0x54(%rsp),%rdx
  mov    0x8(%rsp),%rdi
  add    $0x68,%rsp
  xor    %esi,%esi
  pop    %rbx
  pop    %rbp
  shl    $0x2,%rdx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1050 <memset@plt>
  nopl   0x0(%rax,%rax,1)
L33:
  mov    0x58(%rsp),%rax
  mov    0x18(%rsp),%rcx
  mov    0x8(%rsp),%r8
  lea    (%rbx,%rax,1),%rdx
  mov    %r11,%rax
  cs nopw 0x0(%rax,%rax,1)
L7:
  movss  (%r15,%rax,1),%xmm0
  movss  (%rsi,%rax,1),%xmm1
  addss  (%rcx,%rax,1),%xmm0
  addss  (%rdi,%rax,1),%xmm1
  addss  0x4(%rcx,%rax,1),%xmm0
  addss  0x4(%rdi,%rax,1),%xmm1
  addss  0x4(%r15,%rax,1),%xmm0
  addss  0x4(%rsi,%rax,1),%xmm1
  cvtss2sd %xmm0,%xmm0
  cvtss2sd %xmm1,%xmm1
  mulsd  %xmm6,%xmm0
  mulsd  %xmm6,%xmm1
  subsd  %xmm1,%xmm0
  cvtsd2ss %xmm0,%xmm0
  movss  %xmm0,(%r8,%rax,1)
  add    $0x4,%rax
  cmp    %rdx,%rax
  jne    L7
  jmp    L54
L27:
  movslq 0x14(%rsp),%rax
  mov    0x8(%rsp),%rbx
  xor    %edx,%edx
  mov    0x54(%rsp),%esi
  shl    $0x2,%rax
  lea    -0x4(%rbx,%rax,1),%rcx
  nopl   0x0(%rax,%rax,1)
L96:
  add    $0x1,%edx
  movl   $0x0,(%rcx)
  add    %rax,%rcx
  cmp    %edx,%esi
  jne    L96
L2:
  add    $0x68,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

tool_calls: name: unpack_data
arguments: tag: D0
data_type: f32[4]

tool: {"D0": [0.0,1.625,0.0,1.625]}

assistant: ```c
void horn_dy(image1, image2, dy, nx, ny) float *image1, *image2, *dy;
int nx, ny;
{
  int index, i, j;
  for (i = 0; i < ny - 1; i++) {
    for (j = 0; j < nx - 1; j++) {
      index = (i * nx) + j;
      dy[index] = ((image1[index + nx] + image2[index + nx] + image1[index + nx + 1] + image2[index + nx + 1]) / 4.0) - ((image1[index] + image2[index] + image1[index + 1] + image2[index + 1]) / 4.0);
    }
  }
  for (j = 0; j < nx; j++) {
    dy[(ny - 1) * nx + j] = 0.0;
  }
  for (i = 0; i < ny; i++) {
    dy[(i * nx) + (nx - 1)] = 0.0;
  }
}
```