.define mlu4 .define dvu4 .sect .text .sect .rom .sect .data .sect .bss .sect .text !---------------------------------------------------------------------------- ! SIGNED INTEGER ARITHMETIC !------------------------------------------------------------------------------ adi_l: adroff ; move.w (a5),d0 ; bra 1f adi_z: mov (sp)+,d0 1: sub.w wrd,d0 ; beq adi_1W sub.w wrd,d0 ; beq adi_2W bra e_oddz adi_1W: #if test comp und,(sp) ; beq 6f comp und,word(sp); bne 7f 6: bsr e_iund #endif 7: mov (sp)+,d0 ; ad d0,(sp) #if test bvs 9f #endif jmp (a4) adi_2W: #ifdef lword bsr no8bar ; add.l #8,sp jmp (a4) #else move.l (sp)+,d0 ; add.l d0,(sp) #endif #if test bvs 9f #endif jmp (a4) !-------------------------------------------------------------------------- sbi_z: mov (sp)+,d0 ; bra 1f sbi_l: adroff ; move.w (a5),d0 1: sub.w wrd,d0 ; beq sbi_1W sub.w wrd,d0 ; beq sbi_2W bra e_oddz sbi_1W: #if test comp und,(sp) ; beq 6f comp und,word(sp) ; bne 7f 6: bsr e_iund #endif 7: mov (sp)+,d0 ; subt d0,(sp) #if test bvs 9f #endif jmp (a4) sbi_2W: #ifdef lword add.l #8,sp ; bsr no8bar jmp (a4) #else move.l (sp)+,d0 ; sub.l d0,(sp) #endif #if test bvs 9f #endif jmp (a4) 9: bsr e_iovfl ; jmp (a4) !---------------------------------------------------------------------------- mli_z: mov (sp)+,d0 ; bra 0f mli_l: adroff ; move.w (a5),d0 0: sub.w wrd,d0 ; beq mli_1W sub.w wrd,d0 ; beq mli_2W bra e_oddz mli_1W: mov (sp)+,d0 #if test comp und,d0 ; beq 1f comp und,(sp) ; bne 2f 1: bsr e_iund #endif 2: #ifdef lword move.l (sp)+,d1 ; bra 4f #else muls (sp),d0 ; move.w d0,(sp) #if test bpl 3f ; not.l d0 3: swap d0 ; tst.w d0 ; bne 9b #endif jmp (a4) #endif mli_2W: #ifdef lword bsr no8bar ; add.l #4,sp move.l (sp)+,d0 ; add.l #4,sp move.l (sp)+,d1 #else move.l (sp)+,d0 ; move.l (sp)+,d1 #endif 4: move.l #0,d5 ; tst.l d0 ; bpl 5f neg.l d0 ; not.w d5 5: tst.l d1 ; bpl 6f neg.l d1 ; not.w d5 6: bsr mlu4 #if test tst.l d4 ; bne 7f tst.l d0 ; bpl 8f 7: bsr e_iovfl #endif 8: tst.w d5 ; beq 0f neg.l d0 0: move.l d0,-(sp) !next 4 lines only in case 8 byte arithmetic !#ifdef lword ! bmi 1f ; clr.l -(sp) ; bra 2f !1: move.l #-1,-(sp) !#endif 2: jmp (a4) !subroutine for unsigned 4byte multiplication . Expects multiplier in d0 and ! multiplicant in d1 . Returns 4 byte result in d0 . If d4=0 overflow did ! not occur on the multiplication , else it did . .sect .text mlu4: move.l d1,d3 ; move.l d0,d2 swap d2 ; swap d3 #if test move.l d3,d4 ; mulu d2,d4 #endif mulu d0,d3 ; swap d3 mulu d1,d2 ; swap d2 #if test or.w d3,d4 ; or.w d2,d4 #endif clr.w d3 ; clr.w d2 mulu d1,d0 ; add.l d3,d0 #if test bvc 1f ; bset #0,d4 #endif 1: add.l d2,d0 #if test bvc 2f ; bset #0,d4 #endif 2: rts !--------------------------------------------------------------------------- dvi_z: mov (sp)+,d0 ; bra 0f dvi_l: adroff ; move.w (a5),d0 0: sub.w wrd,d0 ; beq dvi_1W sub.w wrd,d0 ; beq dvi_2W bra e_oddz dvi_1W: #ifdef lword bsr dvi4 ; move.l d1,-(sp) #else bsr dvi2 ; move.w d1,-(sp) #endif jmp (a4) dvi_2W: #ifdef lword bsr no8bar ; tst.l (sp)+ move.l (sp)+,(sp) ; bsr dvi4 move.l d1,-(sp) ; clr.l -(sp) #else bsr dvi4 ; move.l d1,-(sp) #endif jmp (a4) rmi_z: mov (sp)+,d0 ; bra 1f rmi_l: adroff ; move.w (a5),d0 1: sub.l wrd,d0 ; beq rmi_1W sub.l wrd,d0 ; beq rmi_2W bra e_oddz rmi_1W: #ifdef lword bsr dvi4 ; move.l d3,-(sp) #else bsr dvi2 ; swap d1 move.w d1,-(sp) #endif jmp (a4) rmi_2W: #ifdef lword bsr no8bar ; tst.l (sp)+ move.l (sp)+,(sp) ; bsr dvi4 move.l d3,-(sp) ; clr.l -(sp) #else bsr dvi4 ; move.l d3,-(sp) #endif jmp (a4) ! 2byte division . In d1: quotient=low word ; remainder=high word #ifndef lword dvi2: move.l (sp)+,d2 move.w (sp)+,d0 !divisor move.w (sp)+,d1 ; ext.l d1 !dividend #if test cmp.w und,d1 ; bne 1f bsr e_iund 1: cmp.w und,d0 ; bne 2f bsr e_iund 2: tst.w d0 ; bne 3f bsr e_idivz ; move.l und,d1 ; bra 4f 3: #endif divs d0,d1 4: move.l d2,-(sp) ; rts #endif ! long signed division . quotient in d1 , remainder in d3 dvi4: move.l (sp)+,d5 move.l (sp)+,d0 !divisor move.l (sp)+,d1 !dividend #ifdef lword cmp.l und,d0 ; beq 0f cmp.l und,d1 ; bne 1f 0: bsr e_iund 1: #endif move.l #0,d4 !sign in d4 tst.l d0 ; bpl 1f neg.l d0 ; not.w d4 1: tst.l d1 ; bpl 2f neg.l d1 not.w d4 ; swap d4 not.w d4 ; swap d4 2: bsr dvu4 tst.w d4 ; beq 3f neg.l d1 !quotient 3: tst.l d4 ; bpl 4f neg.l d3 !remainder 4: move.l d5,-(sp) ; rts !Expects d0 divisor , d1 dividend. Gives d1 quotient ,d3 remainder .sect .text dvu4: #if test tst.l d0 ; bne 1f bsr e_idivz 1: #endif move.l #0,d3 ; move.l #32,d2 3: lsl.l #1,d1 ; roxl.l #1,d3 cmp.l d0,d3 ; blt 4f sub.l d0,d3 ; add.l #1,d1 4: sub.w #1,d2 ; bgt 3b rts !---------------------------------------------------------------------------- ngi_z: mov (sp)+,d0 ; bra 0f ngi_l: adroff ; move.w (a5),d0 0: sub.l wrd,d0 ; bne 2f #if test comp und,(sp) ; bne 1f bsr e_iund 1: #endif nega (sp) ; jmp (a4) 2: cmp.l wrd,d0 ; beq 3f bra e_oddz 3: #ifdef lword bsr no8bar ; not.l (sp) neg.l 4(sp) #else neg.l (sp) #endif #if test bvc 4f ; bsr e_iovfl 4: #endif jmp (a4) !-------------------------------------------------------------------------- sli_z: mov (sp)+,d0 ; bra 0f sli_l: adroff ; move.w (a5),d0 0: sub.w wrd,d0 ; beq sli_1W sub.w wrd,d0 ; beq sli2 bra e_oddz sli_1W: mov (sp)+,d0 !d0 contains the shift count bmi 5f 9: mov (sp)+,d1 !integer to shift #if test comp und,d0 ; bne 1f bsr e_iund 1: #endif asle d0,d1 ! ASLE #if test bvc 2f ; bsr e_iovfl 2: #endif mov d1,-(sp) ; jmp (a4) sli2: #ifdef lword bsr no8bar ; move.l (sp)+,d1 move.l (sp)+,d2 ; move.l (sp)+,d0 3: asl.l #1,d0 ; roxl.l #1,d2 sub.l #1,d1 ; bgt 3b move.l d0,-(sp) ; move.l d2,-(sp) #else move.w (sp)+,d0 bmi 6f 8: move.l (sp),d1 asl.l d0,d1 #if test bvc 4f ; bsr e_iovfl 4: #endif move.l d1,(sp) #endif jmp (a4) 5: nega d0 ; bra 8f #ifndef lword 6: neg.w d0 ; bra 9f #endif !------------------------------------------------------------------------------ 7: nega d0 ; bra 9b #ifndef lword 6: neg.w d0 ; bra 8b #endif sri_z: mov (sp)+,d0 ; bra 0f sri_l: adroff ; move.w (a5),d0 0: sub.w wrd,d0 ; bne sri2 mov (sp)+,d0 bmi 7b 8: mov (sp)+,d1 #if test comp und,d0 ; bne 1f bsr e_iund 1: #endif asri d0,d1 #if test bvc 2f ; bsr e_iovfl 2: #endif mov d1,-(sp) ; jmp (a4) sri2: sub.w wrd,d0 ; beq 3f bra e_oddz 3: #ifdef lword bsr no8bar ; move.l (sp)+,d1 move.l (sp)+,d2 ; move.l (sp),d0 sub.l #1,d1 4: asr.l #1,d2 ; roxr.l #1,d0 ; dbra d1,4b move.l d0,(sp) ; move.l d2,-(sp) #else move.w (sp)+,d0 bmi 6b 9: move.l (sp),d1 asr.l d0,d1 #if test bvc 5f ; bsr e_iovfl 5: #endif move.l d1,(sp) #endif jmp (a4)