37 lines
752 B
ArmAsm
37 lines
752 B
ArmAsm
|
.sect .text; .sect .rom; .sect .data; .sect .bss
|
||
|
|
.sect .text
|
||
|
|
.define .rmi8
|
||
|
|
|
||
|
|
yl=4
|
||
|
|
yh=8
|
||
|
|
xl=12
|
||
|
|
xh=16
|
||
|
|
! .rmi8 yields ecx:edx = remainder from x / y
|
||
|
|
|
||
|
|
.rmi8:
|
||
|
|
xorb cl,cl ! cl = 0, non-negative result
|
||
|
|
mov eax,xh(esp) ! eax for .divrem8
|
||
|
|
test eax,eax
|
||
|
|
jge 1f ! jump unless x < 0
|
||
|
|
incb cl ! cl = 1, negative result
|
||
|
|
neg eax
|
||
|
|
neg xl(esp)
|
||
|
|
sbb eax,0
|
||
|
|
mov xh(esp),eax ! x = absolute value
|
||
|
|
1: mov edx,yh(esp) ! edx for .divrem8
|
||
|
|
test edx,edx ! flag z for .divrem8 when y >= 0
|
||
|
|
jge 1f ! jump unless y < 0
|
||
|
|
neg edx
|
||
|
|
neg yl(esp)
|
||
|
|
sbb edx,0 ! flag z for .divrem8 when y < 0
|
||
|
|
mov yh(esp),edx ! y = absolute value
|
||
|
|
1: push ecx
|
||
|
|
call .divrem8
|
||
|
|
pop eax
|
||
|
|
testb al,al
|
||
|
|
jz 1f ! jump unless result < 0
|
||
|
|
neg ecx
|
||
|
|
neg edx
|
||
|
|
sbb ecx,0 ! negate remainder ecx:edx
|
||
|
|
1: ret 16
|