IRJET- A Review on Single Precision Floating Point Arithmetic Unit of 32 Bit Number

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3413
A Review on Single Precision Floating Point Arithmetic Unit of
32 bit Number
Mr. Ankit Trivedi1, Mr. Apoorv Verma2
1Assistant Professor, Axis Institute of Technology & Management Kanpur, up, India
2Student, Axis Institute of Technology & Management Kanpur, up, India
------------------------------------------------------------------------***-------------------------------------------------------------------------
Abstract - Roughly computing has turn out to be one of
the most popular computing paradigms in the era of the
Internet of things and big data. It takes advantages of the
error- tolerable feature of many applications, such as
machine learning and image/signal processing, to reduce
the resource required to deliver certain level of
computation quality. Floating point arithmetic unit is widely
used in many areas, especially scientific computation and
signal processing. For many application signal processing
and graphic it is acceptable to trade off some accuracy for
faster and better implementations. Multiplication is the
second basic operation of arithmetic Floating point unit.
FPU may be a part of ADP system specially designed to hold
out operation on floating purpose variety.
Floating point unit is widely used in many areas. This paper
shows review of IEEE 754 standard floating point arithmetic
unit which will perform multiplication, addition and
subtraction function on 32bit operand. A system’s
performance is usually determined by the performance of
the multiplier, because the multiplier is usually the delay
element in the system.
Single-precision floating-point IEEE-754 customary
Adder/Subtractor and number modules with high speed
and space economical square measure best owed.
The arithmetic operations square measure performed on
the many a part of the IEEE format.
Key words: Floating Point Unit, IEEE 754
I. INTRODUCTION
A. Floating-Point Units(FPU)
It is a math coprocessor which is designed specially to carry
out operations on floating point numbers [1]. The FPUs will
perform operations like addition, subtraction, multiplication
and division. Main function of FPUs can execute different
functions such like as exponential or trigonometric
calculations, although these are done with software library
routine in nearly all recent processors. Our FPU is basically
a 32 bit (single precision) IEEE754.
B. Floating-Point Units(FPU)
CPU executes a program then it is calling for a floating- point
(FP) operation, which have three ways it can carry out
the operation also be called by floating-point unit
operation emulator which is floating-point library, used
a series of simple fixed-point arithmetic operations
which can run on the integer ALU. These emulators can
keep the additional hardware price of a FPU but are
significantly slow. Secondly it may us can add-on FPUs
that are entirely separate from the CPU, and are typically
sold as an optional add-ons which are purchased only
when they are needed to speed up math- intensive
operations and integrated FPU present in the system[2].
The FPU design as format of single precision
IEEE754 compliant integrated unit also can’t handle only
basic floating point operations but also handle
operations like shifting, square root determination and
operation of transcendental functions like sine, cosine
and tangential function.
C. IEEE 754 Standard
IEEE 754 used as floating-point computation, followed
by many hardware (CPU and FPU) and software
implementations [3]. Main standard for IEEE 754
Floating-Point calculations defines binary representation
for floating-point numbers is in two types
1) Binary 32 bit (or single precision) format
2) Binary 64 bit (or double precision) format.
SignExponentFractionBias
Single Precision1(31)8(30-23)23(22-00)127
Double
Precision
1(63)11(62-
52)
52(51-00)1023
Table 1: Bit Range for Floating-Point Values
There is given IEEE 754 single-precision
floating-point format that occupies 32 bits in a computer
memory and given range of values in floating point unit.
In IEEE 754, 32-bit with base 2 value format is referred
to as single precision or binary32. It was called by single
in IEEE 754-1985. The IEEE 754 standard given a format
of single precision number which have sign bit
maximum 1 bit length and exponent of width 8 bits ,

significant precision bits have 24 bits out of 23 bits are
stored and where 1 bit is implicit 1.
There is given sign bit which is determining the
value of sign number where 0 denotes a positive number
and 1 denotes a negative number. It is known as sign bits
(mantissa). Where exponent value is an 8 bit signed integer
from −128 to 127 (2's Complement) or can be an 8 bit
unsigned integer from 0 to 255 and given form of IEEE 754
single precision definition. Value of exponent value 127
represents actual zero, mantissa includes 23 fraction bits to
the right of the binary point and an implicit leading bit and
given left of the binary point with value 1 if the exponent is
stored with all zeros. The value of 23 fraction bits of the
mantissa appears in the memory format but there total
precision is 24 bits.
For example:
S 1 BitE 8 BitM 23 Bit
Table 2-Floating Point Number Representation
An IEEE754 standard defines format which have a position
of illustration of numerical values and symbols and also
comprise the sets of bits are encoded.
II. LITERATURE REVIEW
“IEEE Standard given for Floating-Point Arithmetic
Standard 754-2008, New York:” IEEE, It describes the
interchange and an arithmetic method formats for binary
and decimal floating-point arithmetic in computation. These
standards have such conditions to default handling. The
work of a floating-point system has conform to standard
may be in software, entirely in hardware, or in any
combination of software and hardware. In this standard,
numerical results and exclusions specified for different
operations in are exceptionally determined by the, sequence
of operations, values of the input data and destination
formats, all below user control.
Jain, Jenil, and Rahul Agrawal et al. [2] this paper
grants design of high speed floating point unit using
reversible logic. There are various alterable
implementations of logical and arithmetic units have been
proposed in the existing research, but very few reversible
floating-point designs has been designed. Floating- point
processes are used very often in nearly all computing
disciplines. The analysis of projected reversible circuit can
be done in terms of quantum cost, garbage outputs, constant
inputs, power consumption, speed and area.
Gopal, Lenin, Mohd Mahayadin et al. [3] in the
newspaper, eight arithmetic and four logical operations has
been presented. In the intended design 1, Peres Full Adder
Gate (PFAG) is use in reversible ALU plan and HNG gate is
used as an adder logic circuit in the planned ALU design 2.
Both planned design are analyze and compare in terms of
number of gates calculate, garbage output, quantum
price and propagation interruption. The model results
show that the proposed reversible ALU design 2
outperforms the proposed reversible ALU design 1 and
conventional ALU design.
Nachtigal, Michael ,Himanshu Thapliyaletal.[4]
In this work, a innovative design of single precision
floating point multiplier has been proposed based on
operand decomposition approach. Moreover, a new
mutable design of the 8x8 bit Wallace tree multiplier has
proposed that is accustomed in terms of quantum cost,
delay, and number of garbage outputs. Wallace tree
multiplication involves of three intangible steps: Partial
product generation, partial product compression
spending 4:2 compressors, full adders, and half adders,
and then the ultimate accumulation stage to produce the
product. In this slog we perform optimization at each of
these three stages.
Dhanabal, R., Sarat Kumar Sahoo et al. [5]
present a design using reversible gates. Alterable gates
namely TSG gate performs 1-bit addition with carry. This
is the first alterable gate which alone can acts as full
adder. Gate is used to perform logical actions like AND,
OR. In this works, designing 1-bit alum has also been
presented using pass transistor with virtuoso tool of
cadence. Based on examination of the result, this design
using reversible gates is better than that using the
irreversible gates.
Nachtigal, Michael, Himanshu Thapliyal, and
Nagarajan Ranganathan [6] Floating-point actions are
needed very frequently in nearly all computing
disciplines, and studies have shown floating-point
addition to be the most often used floating-point
operation. These paper offerings for the first time a
reversible floating-point adder that closely follows the
IEEE754 specification for binary floating-point
arithmetic. This design requires reversible designs of a
controlled swap unit, a subtractor, an alignment unit,
signed integer representation conversion units, an
integer adder, a normalization unit, and a rounding unit.
Alaghemand, Fatemeh et al. [7] presented a
reversible floating-point adder design, because the fixed-
point adder is less precise in the representation of
numbers.
The planned design is made up of several parts,
including: Conditional swap, Alignment unit, Converter,
Addition and Normalization. We tried to improve the
parameters of quantum cost, garbage outputs and
constant inputs for these parts and finally compared this
design with the existing designs. This planned design has
reduced 78% and 30% of the quantum cost, 78% and
26% of the garbage output and 79% and 30% of the
constant input in compared with other approaches.

Kahanetal.[8] proposed a dozen commercially vital
arithmetic’s boasted various word sizes, precisions,
misestimating procedures and over/underflow behaviors’,
and additional were within the works. Suitable software
system meant to reconcile that numerical diversity had
become unbearably expensive to develop. 13years previous,
once IEEE 754 became official, major microchip makers had
already adopted it despite the challenge it exhibit to
implementers. With new selflessness, hardware designers
had up to its challenge within the belief that they might ease
and encourage a huge burgeoning of numerical software
system. They did succeed to a substantial extent. Anyway,
misestimating a normalizes that preoccupied all folks within
the Seventies afflict solely CRAY X-MPs — J90scurrently.
Ykuntam et al. [9] Planned Addition is that the heart
of arithmetic unit and also the arithmetic unit is commonly
the work horse of a machine circuit. Therefore adders play a
key role in planning Associate in Nursing arithmetic unit
and additionally several digital integrated circuits. Carry
pick Adder is one amongst the quickest adders employed in
several information processors and in digital circuits to
perform arithmetic operations. However CSLA is area-
consuming as a result of it consists of twin ripple carry
adder within the structure. To cut back the world of CSLA, a
CSLA with Binary to Excess-1 converter is already designed
that reduces the world of adder. However there are unit
different techniques to style a CSLA to cut back its space.
One amongst such technique is victimization Associate in
Nursing add one circuit technique. This paper offers the
planning of root CSLA victimization add one circuit with
vital reduction in space.
Quinnell et al. [10] planned several new
architectures for floating-point amalgamate multiplier-
adders employed in the x87 units of microprocessors. These
fresh architectures are designed to produce solutions to the
implementation issues found in modern amalgamate
multiply-add units, at the same time increasing their
performance and decreasing their power consumption. All
new design ,additionally as a group of contemporary
floating- point arithmetic units used as reference styles for
comparison, are styled and enforced victimization the
Advanced small Devices sixty five micro-millimeter atomic
number 14 on dielectric junction transistor technology logic
gate design tool set. All style use the AMD‘Barcelona’native
quad-core standard-cell library as in study basics of making
and differentiating the new architectures in an exceedingly
with-it and more reliable and economic industrial
technology.
This paper show evaluation of IEEE floating point
unit (FPU) which will carry out multiplication, addition,
subtraction and division reason on 32bit operand that uses
the IEEE-754 regulation. Floating point numbers
representation can support a much wider range of values
than fixed point representation. The work is to tool and
analyses floating point unit operation and hardware module
were implemented using VHDL and synthesized using Xilinx
ISE suite.
III. CONCLUSION
This paper presents the floating point unit according to
IEEE 754 Standard. We resolve floating point
representation concept which have large range of
values as well as accuracy. Hence hardware necessity is
reduced, thereby reducing power consumption and
delay. So, designing of power efficient 32-bit single
precision Floating point unit (FPU) based on IEEE-754
standard based on FPGA. In future, one can adopt Vedic
mathematics also.
REFERENCES
[1] “IEEE Standard for Floating-Point Arithmetic”, in
IEEE STD 754-2008, vol., no., pp.1-70, Aug. 292008.
[2] Jain, Jenil, and Rahul Agrawal. "Design and
Development of Efficient Reversible Floating Point
Arithmetic unit." In Communication Systems and
Network Technologies (CSNT), 2015 Fifth
International Conference on, pp. 811-815. IEEE,
2015.
[3] Gopal, Lenin, MohdMahayadin, Syahira, AdibKabir
Chowdhury, Alpha Agape Gopalai, and Ashutosh
Kumar Singh. "Design and synthesis of reversible
arithmetic and Logic Unit (ALU)." In Computer,
Communications, and Control Technology (I4CT),
2014 International Conference on, pp. 289-293.
IEEE, 2014.
[4] Nachtigal, Michael, Himanshu Thapliyal, and
Nagarajan Ranganathan. "Design of a reversible
single precision floating point multiplier based on
operand decomposition." In Nanotechnology
(IEEE-NANO), 2010 10th IEEE Conference on, pp.
233-237. IEEE, 2010.
[5] Dhanabal, R., Sarat Kumar Sahoo, V. Bharathi, V.
Bhavya, Patil Ashwini Chandrakant, and K.
Sarannya. "Design of Reversible Logic Based ALU."
In Proceedings of the International Conference on
Soft Computing Systems, pp. 303-313. Springer
India, 2016.
[6] Nachtigal, Michael, Himanshu Thapliyal, and
Nagarajan Ranganathan. "Design of a reversible
floating-point adder architecture." In Nano
technology (IEEE-NANO), 2011 11th IEEE
Conference on, pp. 451-456. IEEE, 2011.
[7] Alaghemand, Fatemeh, and Majid Haghparast.
"Designing and Improvement of a New Reversible
Floating Point Adder." (2015)’

[8] Kahan, William."IEEEstandard754forbinaryfloating-
point arithmetic."Lecture Notes on the Status of IEEE
754.94720-1776 (1996):11.
[9] Ykuntam, Yamini Devi, MV Nageswara Rao, and G. R.
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Applications 75.2(2013).
[10] Quinnell, Eric, Earl E. Swartzlander Jr, and Carl
Lemonds. "Floating-point fused multiply-add
architectures." Signals, Systems and Computers, 2007
ACSSC 2007. Conference Record of the Forty-First
Asilomar Conference on. IEEE, 2007
[11] F. Conti, D. Rossi, A. Pullini, I. Loi, and L. Benini,
“Energy-efficient vision on the PULP platform forultra-
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[12] V. Camus, J. Schlachter, and C. Enz, “Energy-efficient
in exact speculative adder with high performance and
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[13] Naresh Grover, M.K.Soni Design of FPGA based 32-
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Engineering and Electronic Business, 2014, 1, 1-14
Published Online February 2014 in MECS
[14] Syed M. Qasim, Ahmed A. Telba and Abdulhameed
Y. AlMazroo FPGA Design and Implementation of
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IRJET- A Review on Single Precision Floating Point Arithmetic Unit of 32 Bit Number

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