![]() ![]() Then these unused bits are filled with the copies of signed bit and clear CF and OF flags to zero. If the product of multiplier and multiplicand produce result that fits into the destination register DX and AX with some of the bits left unused. ![]() The only difference between two is one deals with the multiplication of unsigned numbers and the other deals with signed operands. Binary multiplication is a more complicated circuit, but can multiply bigger numbers with less tape and fewer time steps. The operation of MUL and IMUL instructions are same. When the operand is a byte, it is multiplied with AL register and when it is a word, it is multiplied with AX register. 16-bit shifts There are also ways to shift 16-bit registers. If either of these conditions is not met, the result will be flawd. The operands can be positive or negative. Using a method like with multiplications, dividing by 3 for example is ofcourse possible, but only if all input values are even and all multiples of 3. The IMUL instruction allows the multiplication of two signed operands. 8086 Singed Multiplication Instruction (IMUL) The multiplication of two operands give E0D0 which is stored to AX register. Now in this case the data at offset address 20 is 0108h so the operands are DA and 0108. ORG 100h.MODEL SMALL.DATAVAR_1 DW 12DAHVAR_2 DW 3F24H RES DW 2 DUP(?) Reserves 8 bytes of uninitilized data space to RES offset.CODE MOV AX,VAR_1 Load 1st opernd to AXSUB AH,AH MUL 20 Load 2nd operand from effective address 20+VAR_2 multiply it with AXMOV RES,AX Copy AX in lower 2 bytes of RESMOV RES+2,DX Copy DX in upper 2 bytes of RESRET Output You can do this either by subtracting AH from AH or by loading AH with 0. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
February 2023
Categories |