74 lines
1 KiB
ArmAsm
74 lines
1 KiB
ArmAsm
.define .sar2
|
|
.sect .text
|
|
.sect .rom
|
|
.sect .data
|
|
.sect .bss
|
|
.sect .text
|
|
|
|
! Store array element, descriptor contains 2-bytes integers
|
|
! Expects on stack: pointer to array descriptor
|
|
! index
|
|
! base address
|
|
! array element
|
|
! Adapted from .aar2 and .sti
|
|
|
|
.sar2:
|
|
pop h
|
|
shld .retadr1
|
|
mov h,b
|
|
mov l,c
|
|
shld .bcreg
|
|
|
|
pop h ! hl = pointer to descriptor
|
|
pop d ! de = index
|
|
mov a,e ! bc = index - lower bound
|
|
sub m
|
|
inx h
|
|
mov c,a
|
|
mov a,d
|
|
sbb m
|
|
inx h
|
|
mov b,a
|
|
push b ! first operand to multiply
|
|
inx h
|
|
inx h
|
|
mov c,m ! bc = size
|
|
inx h
|
|
mov b,m
|
|
push b ! second operand to multiply
|
|
call .mli2 ! de = size * (index - lower bound)
|
|
pop h ! hl = base address
|
|
dad d ! hl = address of array[index]
|
|
xra a
|
|
mov a,b
|
|
rar
|
|
mov b,a
|
|
mov a,c
|
|
rar
|
|
mov c,a ! bc = word count
|
|
jnc 1f
|
|
|
|
! if 1 byte array element only:
|
|
mov a,c ! trap if bc odd and <>1
|
|
ora b
|
|
cnz eoddz
|
|
pop d
|
|
mov m,e
|
|
jmp 2f
|
|
|
|
1: pop d
|
|
mov m,e
|
|
inx h
|
|
mov m,d
|
|
inx h
|
|
dcx b
|
|
mov a,b
|
|
ora c
|
|
jnz 1b
|
|
|
|
2: lhld .bcreg
|
|
mov b,h
|
|
mov c,l
|
|
lhld .retadr1
|
|
pchl
|