user: Demonstrate the C code that generates the assembly output below:

```asm
<imcd_xor>:
  endbr64
  mov    %rsi,%r10
  mov    %rdx,%rsi
  mov    %rcx,%rax
  mov    0x8(%rsp),%rcx
  test   %rax,%rax
  sete   %dl
  cmp    %rdi,%rax
  sete   %r11b
  or     %dl,%r11b
  jne    L30
  cmp    %r8,%r10
  mov    %r8,%rdx
  cmovle %r10,%rdx
  jmp    L423
L30:
  mov    %rsi,%r9
  mov    %r10,%rdx
  mov    %rdi,%rax
L423:
  or     %r10,%r8
  js     L270
  test   %rdx,%rdx
  jle    L554
  cmp    $0x4,%rcx
  je     L360
  jg     L20
  cmp    $0x1,%rcx
  je     L307
  cmp    $0x2,%rcx
  jne    L463
  cmpl   $0x0,0x10(%rsp)
  je     L55
  cmp    $0x4,%rsi
  sete   %cl
  test   %r11b,%cl
  je     L489
  cmp    $0x4,%r9
  je     L314
L489:
  mov    (%rdi),%ecx
  mov    %ecx,(%rax)
  cmp    $0x1,%rdx
  jle    L94
  mov    $0x1,%r8d
L133:
  add    %r9,%rax
  add    %rsi,%rdi
  xor    (%rdi),%ecx
  mov    %ecx,(%rax)
  add    $0x1,%r8
  cmp    %r8,%rdx
  jne    L133
  jmp    L94
L463:
  mov    $0xfffffffffffffffb,%rdx
  jmp    L94
L20:
  cmp    $0x8,%rcx
  jne    L388
  cmpl   $0x0,0x10(%rsp)
  je     L548
  cmp    $0x4,%rsi
  sete   %cl
  test   %r11b,%cl
  je     L522
  cmp    $0x4,%r9
  je     L194
L522:
  mov    (%rdi),%ecx
  mov    %ecx,(%rax)
  cmp    $0x1,%rdx
  jle    L94
  mov    $0x1,%r8d
L52:
  add    %r9,%rax
  add    %rsi,%rdi
  xor    (%rdi),%ecx
  mov    %ecx,(%rax)
  add    $0x1,%r8
  cmp    %r8,%rdx
  jne    L52
  jmp    L94
L388:
  mov    $0xfffffffffffffffb,%rdx
  jmp    L94
L307:
  cmpl   $0x0,0x10(%rsp)
  je     L280
  cmp    $0x4,%rsi
  sete   %r8b
  test   %r11b,%r8b
  je     L43
  cmp    $0x4,%r9
  je     L254
L43:
  mov    (%rdi),%r8d
  mov    %r8d,(%rax)
  cmp    $0x1,%rdx
  jle    L94
L19:
  add    %r9,%rax
  add    %rsi,%rdi
  xor    (%rdi),%r8d
  mov    %r8d,(%rax)
  add    $0x1,%rcx
  cmp    %rcx,%rdx
  jne    L19
  jmp    L94
L254:
  mov    (%rdi),%ecx
  cmp    $0x1,%rdx
  jle    L94
  lea    0x4(%rdi),%rax
  lea    (%rdi,%rdx,4),%rsi
L123:
  xor    (%rax),%ecx
  mov    %ecx,(%rax)
  add    $0x4,%rax
  cmp    %rsi,%rax
  jne    L123
  jmp    L94
L280:
  mov    (%rdi),%r10d
  mov    %r10d,(%rax)
  cmp    $0x1,%rdx
  jle    L94
L22:
  add    %r9,%rax
  add    %rsi,%rdi
  mov    %r10d,%r8d
  mov    (%rdi),%r10d
  xor    %r10d,%r8d
  mov    %r8d,(%rax)
  add    $0x1,%rcx
  cmp    %rcx,%rdx
  jne    L22
  jmp    L94
L314:
  mov    (%rdi),%ecx
  cmp    $0x1,%rdx
  jle    L94
  lea    0x4(%rdi),%rax
  lea    (%rdi,%rdx,4),%rsi
L44:
  xor    (%rax),%ecx
  mov    %ecx,(%rax)
  add    $0x4,%rax
  cmp    %rsi,%rax
  jne    L44
  jmp    L94
L55:
  mov    (%rdi),%r8d
  mov    %r8d,(%rax)
  cmp    $0x1,%rdx
  jle    L94
  mov    $0x1,%r10d
L426:
  add    %r9,%rax
  add    %rsi,%rdi
  mov    %r8d,%ecx
  mov    (%rdi),%r8d
  xor    %r8d,%ecx
  mov    %ecx,(%rax)
  add    $0x1,%r10
  cmp    %r10,%rdx
  jne    L426
  jmp    L94
L360:
  cmpl   $0x0,0x10(%rsp)
  je     L235
  cmp    $0x4,%rsi
  sete   %cl
  test   %r11b,%cl
  je     L197
  cmp    $0x4,%r9
  je     L136
L197:
  mov    (%rdi),%ecx
  mov    %ecx,(%rax)
  cmp    $0x1,%rdx
  jle    L94
  mov    $0x1,%r8d
L246:
  add    %r9,%rax
  add    %rsi,%rdi
  xor    (%rdi),%ecx
  mov    %ecx,(%rax)
  add    $0x1,%r8
  cmp    %r8,%rdx
  jne    L246
  jmp    L94
L136:
  mov    (%rdi),%ecx
  cmp    $0x1,%rdx
  jle    L94
  lea    0x4(%rdi),%rax
  lea    (%rdi,%rdx,4),%rsi
L570:
  xor    (%rax),%ecx
  mov    %ecx,(%rax)
  add    $0x4,%rax
  cmp    %rax,%rsi
  jne    L570
  jmp    L94
L235:
  mov    (%rdi),%r8d
  mov    %r8d,(%rax)
  cmp    $0x1,%rdx
  jle    L94
  mov    $0x1,%r10d
L59:
  add    %r9,%rax
  add    %rsi,%rdi
  mov    %r8d,%ecx
  mov    (%rdi),%r8d
  xor    %r8d,%ecx
  mov    %ecx,(%rax)
  add    $0x1,%r10
  cmp    %r10,%rdx
  jne    L59
  jmp    L94
L194:
  mov    (%rdi),%ecx
  cmp    $0x1,%rdx
  jle    L94
  lea    0x4(%rdi),%rax
  lea    (%rdi,%rdx,4),%rsi
L546:
  xor    (%rax),%ecx
  mov    %ecx,(%rax)
  add    $0x4,%rax
  cmp    %rax,%rsi
  jne    L546
  jmp    L94
L548:
  mov    (%rdi),%r8d
  mov    %r8d,(%rax)
  cmp    $0x1,%rdx
  jle    L94
  mov    $0x1,%r10d
L512:
  add    %r9,%rax
  add    %rsi,%rdi
  mov    %r8d,%ecx
  mov    (%rdi),%r8d
  xor    %r8d,%ecx
  mov    %ecx,(%rax)
  add    $0x1,%r10
  cmp    %r10,%rdx
  jne    L512
  jmp    L94
L270:
  mov    $0xfffffffffffffffb,%rdx
  jmp    L94
L554:
  mov    $0x0,%edx
L94:
  mov    %rdx,%rax
  ret
```

assistant: ```c
ssize_t imcd_xor(void *src, const ssize_t srcsize, const ssize_t srcstride, void *dst, const ssize_t dstsize, const ssize_t dststride, const ssize_t itemsize, const int decode) {
  const int inplace = (dst == NULL) || (dst == src);
  const ssize_t size = inplace ? srcsize : (((srcsize) < (dstsize)) ? (srcsize) : (dstsize));
  const ssize_t stride = inplace ? srcstride : dststride;
  char *srcptr = (char *)src;
  char *dstptr = inplace ? (char *)src : (char *)dst;
  ssize_t i;
  if ((srcsize < 0) || (dstsize < 0)) {
    return -5;
  }
  if (size <= 0) {
    return 0;
  }
  switch (itemsize) {
  case 1: {
    uint8_t prev, t;
    if (decode) {
      if (inplace && (stride == sizeof(uint8_t)) && (srcstride == sizeof(uint8_t))) {
        uint8_t *psrc = (uint8_t *)srcptr;
        prev = psrc[0];
        for (i = 1; i < size; i++) {
          prev = psrc[i] ^= prev;
        }
      } else {
        *(uint8_t *)dstptr = prev = (*(uint8_t *)srcptr);
        for (i = 1; i < size; i++) {
          dstptr += stride;
          srcptr += srcstride;
          *(uint8_t *)dstptr = prev = (*(uint8_t *)srcptr) ^ prev;
        }
      }
    } else {
      *(uint8_t *)dstptr = prev = (*(uint8_t *)srcptr);
      for (i = 1; i < size; i++) {
        dstptr += stride;
        srcptr += srcstride;
        t = (*(uint8_t *)srcptr);
        *(uint8_t *)dstptr = t ^ prev;
        prev = t;
      }
    }
  }; break;
  case 2: {
    uint16_t prev, t;
    if (decode) {
      if (inplace && (stride == sizeof(uint16_t)) && (srcstride == sizeof(uint16_t))) {
        uint16_t *psrc = (uint16_t *)srcptr;
        prev = psrc[0];
        for (i = 1; i < size; i++) {
          prev = psrc[i] ^= prev;
        }
      } else {
        *(uint16_t *)dstptr = prev = (*(uint16_t *)srcptr);
        for (i = 1; i < size; i++) {
          dstptr += stride;
          srcptr += srcstride;
          *(uint16_t *)dstptr = prev = (*(uint16_t *)srcptr) ^ prev;
        }
      }
    } else {
      *(uint16_t *)dstptr = prev = (*(uint16_t *)srcptr);
      for (i = 1; i < size; i++) {
        dstptr += stride;
        srcptr += srcstride;
        t = (*(uint16_t *)srcptr);
        *(uint16_t *)dstptr = t ^ prev;
        prev = t;
      }
    }
  }; break;
  case 4: {
    uint32_t prev, t;
    if (decode) {
      if (inplace && (stride == sizeof(uint32_t)) && (srcstride == sizeof(uint32_t))) {
        uint32_t *psrc = (uint32_t *)srcptr;
        prev = psrc[0];
        for (i = 1; i < size; i++) {
          prev = psrc[i] ^= prev;
        }
      } else {
        *(uint32_t *)dstptr = prev = (*(uint32_t *)srcptr);
        for (i = 1; i < size; i++) {
          dstptr += stride;
          srcptr += srcstride;
          *(uint32_t *)dstptr = prev = (*(uint32_t *)srcptr) ^ prev;
        }
      }
    } else {
      *(uint32_t *)dstptr = prev = (*(uint32_t *)srcptr);
      for (i = 1; i < size; i++) {
        dstptr += stride;
        srcptr += srcstride;
        t = (*(uint32_t *)srcptr);
        *(uint32_t *)dstptr = t ^ prev;
        prev = t;
      }
    }
  }; break;
  case 8: {
    uint64_t prev, t;
    if (decode) {
      if (inplace && (stride == sizeof(uint64_t)) && (srcstride == sizeof(uint64_t))) {
        uint64_t *psrc = (uint64_t *)srcptr;
        prev = psrc[0];
        for (i = 1; i < size; i++) {
          prev = psrc[i] ^= prev;
        }
      } else {
        *(uint64_t *)dstptr = prev = (*(uint64_t *)srcptr);
        for (i = 1; i < size; i++) {
          dstptr += stride;
          srcptr += srcstride;
          *(uint64_t *)dstptr = prev = (*(uint64_t *)srcptr) ^ prev;
        }
      }
    } else {
      *(uint64_t *)dstptr = prev = (*(uint64_t *)srcptr);
      for (i = 1; i < size; i++) {
        dstptr += stride;
        srcptr += srcstride;
        t = (*(uint64_t *)srcptr);
        *(uint64_t *)dstptr = t ^ prev;
        prev = t;
      }
    }
  }; break;
  default:
    return -5;
  }
  return size;
}
```