native_mode .macro
    clc
    xce
.endmacro

long_a .macro
    rep #$20
    .al
.endmacro

short_a .macro
    sep #$20
    .as
.endmacro

long_i .macro
    rep #$10
    .xl
.endmacro

short_i .macro
    sep #$10
    .xs
.endmacro

save_registers .macro
    php
    .long_a
    .long_i
    pha
    phx
    phy
    .short_a
    .long_i
.endmacro

restore_registers .macro
    .long_a
    .long_i
    ply
    plx
    pla
    plp
    .short_a
    .long_i
.endmacro

; Copies up to 64KB (aligned to bank boundaries)
memcpy .macro dest, src, count
    .save_registers
    .long_a
    
    ldx #<>\src
    ldy #<>\dest
    lda #\count - 1

    .if \dest > \src
        mvp #`\src, #`\dest
    .else 
        mvn #`\src, #`\dest
    .endif

    .restore_registers
.endmacro