?? ulmul.s,v
字號(hào):
head 1.1;access;symbols;locks dls:1.1; strict;comment @# @;1.1date 97.09.21.19.27.40; author dls; state Dist;branches;next ;desc@@1.1log@pre-3e code@text@|J. Test 1/81|unsigned long multiply: c = a * b .globl ulmul .textulmul: link a6,#0 moveml #0x3000,sp@@- |save d2,d3 movl a6@@(8),d2 |d2 = a movl a6@@(12),d3 |d3 = b clrl d0 movw d2,d0 |d0 = alo, unsigned mulu d3,d0 |d0 = blo*alo, unsigned movw d2,d1 |d1 = alo swap d2 |swap alo-ahi mulu d3,d2 |d2 = blo*ahi, unsigned swap d3 |swap blo-bhi mulu d3,d1 |d1 = bhi*alo, unsigned addl d2,d1 |d1 = (ahi*blo + alo*bhi) swap d1 |d1 = clrw d1 | (ahi*blo + alo*bhi)*(2**16) addl d1,d0 |d0 = alo*blo + (ahi*blo + alo*bhi)*(2**16)3$: moveml sp@@+,#0xC |restore d2,d3 unlk a6 rts@?? 快捷鍵說(shuō)明
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