Table of Contents
- 1 What is the benefit of having fixed length instructions over variable length instructions?
- 2 What are the advantages and disadvantages of variable length encoding?
- 3 What is a fixed length instruction?
- 4 What is the difference between fixed length and variable length?
- 5 What are variable length instructions?
- 6 What is variable length instruction format?
What is the benefit of having fixed length instructions over variable length instructions?
A minor advantage of fixed length instructions compared to typical variable length encodings is that instruction addresses (and branch offsets) use fewer bits. This has been exploited in some ISAs to provide a small amount of extra storage for mode information.
What are the advantages and disadvantages of variable length encoding?
Advantages: It easy to provide a large repertoire of opcodes, Addressing can be more flexible, with various combinations of register. Disadvantages: an increase in the complexity of the CPU.
What is an important disadvantage of variable length instructions?
Disadvantages of variable length instruction format: Processor complexity depends on instruction length. Variable length instruction format does not remove desirability of instruction length which is integrally related to word length.
What are the advantages of using a variable length instruction format?
Advantages of variable length instruction format: Provides large repertoire of Opcode with variable length. o Registers. o Addressing modes.
What is a fixed length instruction?
Some computer CPUs use a fixed length instruction encoding format. That means: Every computer instruction is represented using the same number of bytes.
What is the difference between fixed length and variable length?
Fixed-length records – all the records are exactly the same length. Variable-length records – the length of each record varies.
What are the advantages of fixed length encoding?
Advantages of fixed-length instructions are given below: It simplifies the process of instruction fetching. The instruction pointer is incremented by a constant amount. The length of the instruction is known in advance.
What is the difference between fixed length and variable length encoding schemes?
Variable length encoding scheme uses different number of bytes or octets (set of 8 bits) to represent different characters whereas fixed length encoding scheme uses a fixed number of bytes to represent different characters.
What are variable length instructions?
x86 instructions are variable-length, which means that common instructions typically have a shorter encoding and so take up less space in instruction cache. Therefore, x86 chips need smaller instruction caches for the same performance. This is very important.
What is variable length instruction format?
Some computer CPUs use a “variable” length instruction encoding format. That means: Different computer instructions is represented using different number of bytes. There is basically no constraint on how many bytes is used in encoding the computer instruction (i.e.: use as many bytes you need)
What is fixed length and variable length?
Fixed length means having a set length that never varies. In database systems, a field can have a fixed or a variable length. A variable-length field is one whose length can be different in each record, depending on what data is stored in the field. A variable-length record has at least one variable-length field.
What is the difference between fixed length and variable-length Huffman code?
In a fixed-length code each codeword has the same length. In a variable-length code codewords may have different lengths.