On Wednesday 16 August 2006 11:48, Ryo Saeba wrote: > On 8/16/06, Leanz <[EMAIL PROTECTED]> wrote: > > maksudnya 100 x 2 lebih cepat dari 2 x 100. > > http://pdos.csail.mit.edu/6.828/2005/readings/i386/IMUL.htm > > The 80386 uses an early-out multiply algorithm. The actual number of > clocks depends on the position of the most significant bit in the > optimizing multiplier, shown underlined above. The optimization occurs > for positive and negative values. Because of the early-out algorithm, > clock counts given are minimum to maximum. > > karena ada early-out algorithm, begitu sudah tidak ada lagi > significant bit di faktor pengali, operasi perkalian bisa langsung > selesai. ini mengakibatkan proses perkalian integer di x86 merupakan > proses asimetris, bergantung pada letak significant bit. 2 x 100 > berarti faktor pengali adalah 100, significant bit dari 100 itu jauh > lebih di sebelah kiri ketimbang 100 x 2, faktor pengalinya adalah 2, > significant bit-nya cuma 1 bit dari kanan.
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