user: 下面的汇编指令对应的C源代码是什么：

```asm
<reflectYchar>:
  endbr64
  push   %r15
  push   %r14
  mov    %edx,%r14d
  shr    $0x1f,%r14d
  push   %r13
  add    %edx,%r14d
  push   %r12
  sar    %r14d
  push   %rbp
  push   %rbx
  cmp    $0x1,%edx
  jle    L57
  mov    %esi,%r10d
  test   %esi,%esi
  jle    L57
  mov    %esi,%eax
  lea    -0x1(%rsi),%r12d
  mov    %esi,%ebp
  mov    %rdi,%rcx
  shr    $0x4,%eax
  mov    %edx,%r13d
  and    $0xfffffff0,%ebp
  xor    %r11d,%r11d
  lea    -0x1(%rax),%ebx
  mov    %esi,%eax
  and    $0xf,%eax
  add    $0x1,%rbx
  mov    %eax,-0x18(%rsp)
  sub    $0x1,%eax
  shl    $0x4,%rbx
  mov    %eax,-0x14(%rsp)
  mov    %r12d,%eax
  lea    0x1(%rdi,%rax,1),%rax
  mov    %rax,-0x10(%rsp)
  xchg   %ax,%ax
L108:
  mov    %r13d,%edi
  mov    %r10d,%r9d
  sub    %r11d,%edi
  imul   %r11d,%r9d
  sub    $0x1,%edi
  imul   %r10d,%edi
  movslq %r9d,%rdx
  movslq %edi,%r8
  lea    0x10(%r8),%rax
  cmp    %rax,%rdx
  lea    0x10(%rdx),%rax
  setge  %sil
  cmp    %rax,%r8
  setge  %al
  or     %sil,%al
  je     L159
  cmp    $0x6,%r12d
  jbe    L159
  cmp    $0xe,%r12d
  jbe    L161
  lea    (%rcx,%rdx,1),%r15
  lea    (%rcx,%r8,1),%rsi
  xor    %eax,%eax
  cs nopw 0x0(%rax,%rax,1)
L12:
  movdqu (%r15,%rax,1),%xmm0
  movdqu (%rsi,%rax,1),%xmm1
  movups %xmm1,(%r15,%rax,1)
  movups %xmm0,(%rsi,%rax,1)
  add    $0x10,%rax
  cmp    %rax,%rbx
  jne    L12
  cmp    %ebp,%r10d
  je     L174
  cmpl   $0x6,-0x14(%rsp)
  mov    -0x18(%rsp),%r15d
  jbe    L112
  mov    %ebp,%eax
  mov    %ebp,%esi
L20:
  add    %rax,%rdx
  add    %r8,%rax
  add    %rcx,%rax
  add    %rcx,%rdx
  movq   (%rax),%xmm0
  mov    (%rdx),%r8
  movq   %xmm0,(%rdx)
  mov    %r8,(%rax)
  mov    %r15d,%eax
  and    $0xfffffff8,%eax
  add    %eax,%esi
  cmp    %eax,%r15d
  je     L174
L126:
  lea    (%r9,%rsi,1),%edx
  lea    (%rdi,%rsi,1),%eax
  movslq %edx,%rdx
  cltq
  add    %rcx,%rax
  add    %rcx,%rdx
  movzbl (%rax),%r15d
  movzbl (%rdx),%r8d
  mov    %r15b,(%rdx)
  mov    %r8b,(%rax)
  lea    0x1(%rsi),%eax
  cmp    %eax,%r10d
  jle    L174
  lea    (%r9,%rax,1),%edx
  add    %edi,%eax
  movslq %edx,%rdx
  cltq
  add    %rcx,%rax
  add    %rcx,%rdx
  movzbl (%rax),%r15d
  movzbl (%rdx),%r8d
  mov    %r15b,(%rdx)
  mov    %r8b,(%rax)
  lea    0x2(%rsi),%eax
  cmp    %eax,%r10d
  jle    L174
  lea    (%r9,%rax,1),%edx
  add    %edi,%eax
  movslq %edx,%rdx
  cltq
  add    %rcx,%rax
  add    %rcx,%rdx
  movzbl (%rax),%r15d
  movzbl (%rdx),%r8d
  mov    %r15b,(%rdx)
  mov    %r8b,(%rax)
  lea    0x3(%rsi),%eax
  cmp    %eax,%r10d
  jle    L174
  lea    (%r9,%rax,1),%edx
  add    %edi,%eax
  movslq %edx,%rdx
  cltq
  add    %rcx,%rax
  add    %rcx,%rdx
  movzbl (%rax),%r15d
  movzbl (%rdx),%r8d
  mov    %r15b,(%rdx)
  mov    %r8b,(%rax)
  lea    0x4(%rsi),%eax
  cmp    %eax,%r10d
  jle    L174
  lea    (%r9,%rax,1),%edx
  add    %edi,%eax
  movslq %edx,%rdx
  cltq
  add    %rcx,%rax
  add    %rcx,%rdx
  movzbl (%rax),%r15d
  movzbl (%rdx),%r8d
  mov    %r15b,(%rdx)
  mov    %r8b,(%rax)
  lea    0x5(%rsi),%eax
  cmp    %eax,%r10d
  jle    L174
  lea    (%r9,%rax,1),%edx
  add    %edi,%eax
  add    $0x6,%esi
  movslq %edx,%rdx
  cltq
  add    %rcx,%rdx
  add    %rcx,%rax
  movzbl (%rdx),%r8d
  movzbl (%rax),%r15d
  mov    %r15b,(%rdx)
  mov    %r8b,(%rax)
  cmp    %esi,%r10d
  jle    L174
  lea    (%r9,%rsi,1),%eax
  add    %edi,%esi
  cltq
  movslq %esi,%rsi
  add    %rcx,%rax
  add    %rcx,%rsi
  movzbl (%rax),%edx
  movzbl (%rsi),%edi
  mov    %dil,(%rax)
  mov    %dl,(%rsi)
L174:
  add    $0x1,%r11d
  cmp    %r14d,%r11d
  jl     L108
L57:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L159:
  mov    -0x10(%rsp),%rdi
  lea    (%rcx,%rdx,1),%rax
  lea    (%rdi,%rdx,1),%r9
  nopl   (%rax)
L74:
  mov    %rax,%rsi
  movzbl (%rax),%edi
  add    $0x1,%rax
  sub    %rdx,%rsi
  movzbl (%rsi,%r8,1),%r15d
  mov    %r15b,-0x1(%rax)
  mov    %dil,(%rsi,%r8,1)
  cmp    %r9,%rax
  jne    L74
  jmp    L174
L161:
  mov    %r10d,%r15d
  xor    %eax,%eax
  xor    %esi,%esi
  jmp    L20
L112:
  mov    %ebp,%esi
  jmp    L126
```

assistant: ```c
void reflectYchar(char *image, int width, int height) {
  int row, col;
  char temp;
  for (row = 0; row < (height / 2); row++) {
    for (col = 0; col < width; col++) {
      temp = image[row * width + col];
      image[row * width + col] = image[(height - row - 1) * width + col];
      image[(height - row - 1) * width + col] = temp;
    }
  }
}
```