Linux 上 fasm 中的西里尔字母到上位函数

Question

我有一部分代码可以像一个 unicode 符号一样比较 ax 中的 2 个字节并将其转换为大写字节，但在俄语字母表中功能不起作用。

; first byte starts with 110
; and second with 10
; like 110 10001 10 010001
; so 10001010001 is 1105 or 0451 

cmp ax, 1101000110010001b ; ё russian this one is a bit not in the range of others
je convert_yo

cmp ax, 1101000110001111b ; я russian, 1071 or 042F in unicode
ja loop_next ; skip

cmp ax, 1101000010101111b ; Я russian, 1103 or 044F in unicode
ja strochnaya


; just add 2 bytes to rdi and skip em
add rdi, 2
jmp loop_string ; begin new itteration of all function

strochnaya:
   sub ax, word 20h ; -32 because in russian alphabet 33 and -1 ё = 32 symbols
   jmp end_russian_symbol

convert_yo:
   mov ax, 1101000010000001b ; Ё

end_russian_symbol:
; also dont know why just ax doesnt work
; mov word [rdi], ax
    mov byte [rdi], ah
    mov byte [rdi + 1], al
    add rdi, 2         ; add 2 bytes
    jmp loop_string ; begin new itteration of all function

当然，我相信可以有像 ё 这样的解决方案，但对于每个符号，但这样做不是人类的。

Answer 1

unicode 的地狱

;110 10000 10 111111 ; п
;110 10000 11 000000 ; no more unicode, cuz second byte doesnt starts with 10
;110 10001 10 000000 ; р

所以

strochnaya:
cmp ax, 1101000010111111b ; п 
ja more_tan_p_strochnaya

simple_strochnaya:
    sub ax, word 20h ; just -32
    jmp end_russian_symbol

more_tan_p_strochnaya:
    sub ax, word 0xE0  ; 225 because 193 for save 10 of second byte and + 32 = 225
    jmp end_russian_symbol