;by John Payson
clrf DstH clr DstM clr DstL mov W, SrcL and W, #$0F sb Src.4 add DstM, W rr DstM rr DstL sb Src.5 add DstM, W rr DstM rr DstL sb Src.6 add DstM, W rr DstM rr DstL sb Src.7 add DstM, W call Sqr4 add DstL, W swap SrcL and W, #$0F call Sqr4 add DstM, W ; At this point, 16-bit result is in DstM:DstH ; 25 words of code prior to this point (plus a ; 17-word table-lookup). Total execution time: ; 35 cycles up to this point. sb SrcH.0 jmp NoBit8 mov W, SrcL snb C inc DstH add DstM, W snb C inc DstH inc DstH ; Another 9 words for bit 8; 3 or 9 cycles to exec. NoBit8: sb SrcH.1 jmp NoBit9 mov W, #4 sb SrcH.0 mov W, #8 add DstH, W mov W, <<SrcL snb C inc DstH snb C inc DstH add DstM, W snb C inc DstH add DstM, W snb C inc DstH ; Another 17 words for bit 9; 3 or 17 cycles to execute ; Total worst-case time: 35+26 = 61 cycles. NoBit9: retw #0 ; All done! Sqr4: add PC, W db 0,1,4,9,16,25,36,49,64,81,100,121,144,169,196,225
See also:
file: /Techref/scenix/lib/math/sq/10b_sx.htm, 2KB, , updated: 2004/6/10 14:40, local time: 2024/8/22 06:35,
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