source: trunk/minix/lib/i86/int64/sub64.s@ 10

!       sub64() - 64 bit subtraction                    Author: Kees J. Bot
!                                                               24 Dec 1995
.sect .text
.define _sub64

_sub64:                         ! u64_t sub64(u64_t i, u64_t j);
        push    bp
        mov     bp, sp
        mov     bx, 4(bp)
        mov     ax, 6(bp)
        sub     ax, 14(bp)
        mov     (bx), ax
        mov     ax, 8(bp)
        sbb     ax, 16(bp)
        mov     2(bx), ax
        mov     ax, 10(bp)
        sbb     ax, 18(bp)
        mov     4(bx), ax
        mov     ax, 12(bp)
        sbb     ax, 20(bp)
        mov     6(bx), ax
        mov     ax, bx
        pop     bp
        ret