Contents
- 1 How does a computer multiply?
- 2 Is there a multiply instruction?
- 3 Which of the following is the most powerful type of computer?
- 4 What mode do computers calculate numbers?
- 5 Which of the following instruction is invalid?
- 6 How do you multiply and divide in binary?
- 7 Is there a way to beat a plain multiply?
- 8 When to use multiply by reciprocal in Assembly?
How does a computer multiply?
A binary multiplier is an electronic circuit used in digital electronics, such as a computer, to multiply two binary numbers. Most techniques involve computing the set of partial products, which are then summed together using binary adders. …
Is there a multiply instruction?
There are two instructions for multiplying binary data. The MUL (Multiply) instruction handles unsigned data and the IMUL (Integer Multiply) handles signed data. Both instructions affect the Carry and Overflow flag.
Which instruction is used instead of Mul?
Do division by multiplying by the reciprocal value. Use shifts and adds/subs instead of multiplication.
Which of the following is the most powerful type of computer?
Supercomputers
The correct answer is Super Computer. Supercomputers were introduced in the 1960s as the world’s most advanced computer. A supercomputer is a powerful computer that can process a large amount of data and computation very quickly. Supercomputers perform immense amounts of mathematical calculations.
What mode do computers calculate numbers?
binary
Computers turn every number into binary. The numbers that we use are expressed in base 10. Every 10 1s equals 1 ten, every 10 tens equals 1 hundred, and so on. In binary, you go up a unit every 2 numbers.
What is the value of ZF if the result of an instruction is 0?
For example when you add bytes 255 + 1 (result is not in range 0… 255). When there is no overflow this flag is set to 0. Zero Flag (ZF) – set to 1 when result is zero.
Which of the following instruction is invalid?
Which of the following instruction is not valid? Explanation: Both the source and destination operands cannot be memory locations except for string instructions.
How do you multiply and divide in binary?
For binary multiplication, we follow the same process as multiplying two decimal numbers where we multiply each digit of the second number by the first whole number, then we just need to add them, switching each resulting multiplication one digit to the left.
What kind of microprocessor has a multiply instruction?
Though the multiply instruction became common with the 16-bit generation, at least two 8-bit processors have a multiply instruction: the Motorola 6809, introduced in 1978, and Intel MCS-51 family, developed in 1980, and later the modern Atmel AVR 8-bit microprocessors present in the ATMega, ATTiny and ATXMega microcontrollers.
Is there a way to beat a plain multiply?
There is no real way to beat a plain multiply on a modern CPU. According to Agner Fog’s asm lib instruction page 12: Division is slow on most microprocessors. In floating point calculations, we can do multiple divisions with the same divisor faster by multiplying with the reciprocal, for example:
When to use multiply by reciprocal in Assembly?
Multiplying by the reciprocal works well when you need to divide by a constant or if you divide by the same variable many times in a row. You can find really cool assembly code demonstrating the concept in Agner Fog’s assembly library. A shift right is a divide by two shr – ( R educe).
How does multiplication work in 6502 assembly language?
Lance Leventhal’s 6502 Assembly Language Subroutines includes, on page 236, a 16-bit multiply routine that does this. Probably the most important thing to understand while reading this is that on the 6502 the ROR (rotate right) instruction shifts the lowest-order bit into the carry flag, and the carry flag into the highest order bit.
https://www.youtube.com/watch?v=htVJTW50WA0