28 lines
490 B
ArmAsm
28 lines
490 B
ArmAsm
|
.define Rmi2
|
||
|
|
|
||
|
|
! This subroutine returns the remainder of a twobyte signed division.
|
||
|
|
! The sign of the result is as specified in the emtest.
|
||
|
|
|
||
|
|
|
||
|
|
Rmi2:
|
||
|
|
ldy #0
|
||
|
|
sty NBYTES ! for the sign of the result
|
||
|
|
stx ARTH
|
||
|
|
sta ARTH+1 ! first operand
|
||
|
|
jsr Pop
|
||
|
|
stx ARTH+2
|
||
|
|
sta ARTH+3 ! second operand
|
||
|
|
ldy #0
|
||
|
|
sty UNSIGN ! its signed arithmetic
|
||
|
|
jsr Div
|
||
|
|
lsr ARTH+5
|
||
|
|
ror ARTH+4 ! result must be shifted one time
|
||
|
|
ldx ARTH+4
|
||
|
|
lda ARTH+5
|
||
|
|
ldy NBYTES
|
||
|
|
beq 1f ! result must be positive
|
||
|
|
jmp Ngi2
|
||
|
|
1: rts
|
||
|
|
|
||
|
|
|