Index
> Non-x86 architectures > MCS-80/85 |
| Author |
|
|
shoorick
Here is the new support for i8080/85 CPUs
I decided to put it separately from the old thread as it uses now fasmg not fasm and much more convenient in use. Bug reports welcome 
_________________ UNICODE forever! Last edited by shoorick on 10 Nov 2016, 22:07; edited 5 times in total |
||||||||||||||||||||||||||||||
18 Aug 2015, 07:03 |
|
|||||||||||||||||||||||||||||
|
shoorick
an integer square root of dword for i8080:
Code: ;======================================================================= ; BC = SQRT(DEHL) ;----------------------------------------------------------------------- sqrt32: ;----------------------------------------------------------------------- mvi a,30 + 2 push psw ; s+2 lxi b, 0 ; y push d ; xh push h ; xl ;----------------------------------------------------------------------- .loop: pop h pop d pop psw sui 2 ; a=s rm ;----------------------------------------------------------------------- push psw push d push h mov l,c mov h,b dad h mov c,l mov b,h ; BC=y=2*y ;----------------------------------------------------------------------- lxi d,0 dad h inx h ; DEHL=b=2*y+1 ;----------------------------------------------------------------------- inr a .shift: dcr a jz .skip xchg dad h jc .loop xchg dad h jnc .shift inx d jmp .shift .skip: ; DEHL << A=s ;----------------------------------------------------------------------- push d push h lxi h,4 dad sp xchg ; DE --> X lxi h,0 dad sp ; HL --> B ;----------------------------------------------------------------------- ldax d sub m mov m,a inx h inx d ldax d sbb m mov m,a inx h inx d ldax d sbb m mov m,a inx h inx d ldax d sbb m mov m,a ;----------------------------------------------------------------------- pop h pop d jc .loop ;----------------------------------------------------------------------- xthl pop h xchg xthl push d inx b jmp .loop ;======================================================================= _________________ UNICODE forever! |
|||
|
04 Aug 2016, 15:25 |
|
|
shoorick
a realisation of dividing to 10 via shifting.
the basic implementation was taken there: Code: unsigned divu10(unsigned n) { unsigned q, r; q = (n >> 1) + (n >> 2); q = q + (q >> 4); q = q + (q >> 8); q = q + (q >> 16); q = q >> 3; r = n - q*10; return q + ((r + 6) >> 4); // return q + (r > 9); } ported to: Code: ;======================================================================= ; HL [DE] = HL/10 ;----------------------------------------------------------------------- proc udiv10 ;----------------------------------------------------------------------- ora a mov a,h rar mov b,a mov a,l rar mov c,a ; bc = n >> 1 ora a mov a,b rar mov d,a mov a,c rar add c mov e,a mov c,a mov a,d adc b mov b,a mov d,a ; bc = de = (hl>>1)+(hl>>2) = q xchg ; de = n xra a call shr_hl.s4 ; hl = q >> 4 dad b ; hl = q = q + (q>>4) mov c,h mvi b,0 dad b ; hl = q = q + (q>>8) xra a call shr_hl.s3 ; hl = q = q >> 3 mov b,h mov c,l ; bc = q dad h dad h dad b dad h ; hl = q*10 mov a,e sub l mov e,a ; e = r mvi d,0 adi 6 rar rar rar rar ani 15 ; a = (r+6)>>4 add c mov l,a mov h,b rnc inr h ret ;----------------------------------------------------------------------- .dummy = shr_hl ;----------------------------------------------------------------------- endp ;======================================================================= ; ;======================================================================= ; A MUST BE 0 ! ;----------------------------------------------------------------------- proc shr_hl ;----------------------------------------------------------------------- .s1:dad h ral .s2:dad h ral .s3:dad h ral .s4:dad h ral .s5:dad h ral .s6:dad h ral .s7:dad h ral mov l,h mov h,a ret ;----------------------------------------------------------------------- endp ;======================================================================= |
|||
|
23 Aug 2016, 07:32 |
|
|
shoorick
a multibyte mathematic is tested - you may check it with attached project. new library and latest fasmg required to compile!
_________________ UNICODE forever! |
||||||||||||||||||||||||||||||
|
09 Sep 2016, 12:52 |
|
|||||||||||||||||||||||||||||
|
jmg
shoorick wrote: Here is the new support for i8080/85 CPUs This is cool. I'm curious about one macro detail you used. I see irp used Code: irp <mnem,opcode>,XCHG?,0EBh,PCHL?,0E9h,XTHL?,0E3h,SPHL?,0F9h,\ RLC?, 007h,RRC?, 00Fh,RAL?, 017h,RAR?, 01Fh,\ DAA?, 027h,CMA?, 02Fh,STC?, 037h,CMC?, 03Fh,\ NOP?, 000h,RET?, 0C9h,RIM?, 020h,SIM?, 030h,\ HLT?, 076h,EI?, 0FBh,DI?, 0F3h macro mnem db opcode end macro end irp That gives quite compact macros, but is it slower/==/faster? than creating a macro-per-opcode ? Seems the irp has to loop to build the macros, but it does save file-lines-read, and this does run once, compared to many more opcodes in user source files. |
|||
|
20 Sep 2016, 21:33 |
|
|
revolution
jmg wrote: ... but is it slower/==/faster? than creating a macro-per-opcode ? |
|||
|
21 Sep 2016, 00:06 |
|
|
jmg
revolution wrote: You can test that for yourself with your computer. Let us know the results. OK, yes that is one 'answer'.... Perhaps a better answer, will come from someone who may have done this already, which is what I was asking ? |
|||
|
21 Sep 2016, 00:42 |
|
|
shoorick
it is slower, sure, maybe, for few µs
A while I do not see any delay with assembling. I can not fit a program more than 32kB into the such model of computer, but even if it were some seconds for assembling, it would not be bothering me
Code: C:\spec\fasmg\fasmg.exe DEMO.asm DEMO.rks flat assembler g version 0.97.1471502275 4 passes, 0.3 seconds, 3066 bytes. |
|||
|
21 Sep 2016, 02:25 |
|
< Last Thread | Next Thread > |
Forum Rules:
|