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We all know that the “R” in RISC means “reduced.” Lately, as the number of components that can be manufactured on a chip has increased, CPU designers have been looking at ways to make their processors faster by adding features. We have already talked about many of the features such as on-chip multipliers, very fast floating-point, lots of registers, and on-chip caches. Even with all of these features, there seems to be space left over. Also, because much of the design of the control section of the processor is automated, it might not be so bad to add just a “few” new instructions here and there. Especially if simulations indicate a 10% overall increase in speed!

So, what does it mean when they add 15 instructions to a RISC instruction set architecture (ISA)? Would we call it “not-so-RISC”? A suggested term for this trend is FISC, or fast instruction set computer . The point is that reducing the number of instructions is not the goal. The goal is to build the fastest possible processor within the manufacturing and cost constraints. People will argue forever but, in a sense, reducing the instruction set was never an end in itself, it was a means to an end.

Some of the types of instructions that are being added into architectures include:

  • More addressing modes
  • Meta-instructions such as “decrement counter and branch if non-zero”
  • Specialized graphics instructions such as the Sun VIS set, the HP graphics instructions, the MIPS Digital Media Extentions (MDMX), and the Intel MMX instructions

Interestingly, the reason that the first two are feasible is that adder units take up so little space, it is possible to put one adder into the decode unit and another into the load/store unit. Most visualization instruction sets take up very little chip area. They often provide “ganged” 8-bit computations to allow a 64-bit register to be used to perform eight 8-bit operations in a single instruction.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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Source:  OpenStax, High performance computing. OpenStax CNX. Aug 25, 2010 Download for free at http://cnx.org/content/col11136/1.5
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