The document discusses function call optimization in C++. It provides examples of constructor, base class constructor, and get/set method calls in both debug and release builds. In release builds, the compiler fully optimizes constructor calls and inlines non-virtual functions like get/set methods to improve performance. Only virtual functions cannot be optimized as their call sequence depends on runtime type.
Xlab #1: Advantages of functional programming in Java 8XSolve
Presentation from xlab workshop about functional programming components introduced to the Java 8. How to operate the streams and lambdas in theory and practice.
Xlab #1: Advantages of functional programming in Java 8XSolve
Presentation from xlab workshop about functional programming components introduced to the Java 8. How to operate the streams and lambdas in theory and practice.
Redis & ZeroMQ: How to scale your applicationrjsmelo
Presented at #PHPLX 11 July 2013
When you need to do some heavy processing how do you scale you application?
You can use Redis and ZeroMQ to leverage the heavy work for you!
With this presentation we will know more about this two technologies and how they can be used to help solve problems with the performance and scalability of your application.
Slide utilisé lors du Meetup du 16 juin 2017 organisé par l'AFUP Montpellier
Présentation des PHP Standards Recommendations (PSR). Leurs buts et l'avantage de les utiliser
Some techniques from the heady world of Functional Programming implemented in idiomatic Perl using various techniques: closures, iterators, Devel::Declare, and some distilled evil. New version now with monads! (As presented at http://conferences.yapceurope.org/lpw2008/ )
Using Mikko Koppanen's PHP ZMQ extension we will look at how you can easily distribute work to background processes, provide flexible service brokering for your next service oriented architecture, and manage caches efficiently and easily with just PHP and the ZeroMQ libraries. Whether the problem is asynchronous communication, message distribution, process management or just about anything, ZeroMQ can help you build an architecture that is more resilient, more scalable and more flexible, without introducing unnecessary overhead or requiring a heavyweight queue manager node.
Perl6 regular expression ("regex") syntax has a number of improvements over the Perl5 syntax. The inclusion of grammars as first-class entities in the language makes many uses of regexes clearer, simpler, and more maintainable. This talk looks at a few improvements in the regex syntax and also at how grammars can help make regex use cleaner and simpler.
Conférence données à l'Open World Forum, 05 octobre 2013.
Comment créer une base de données noSQL par paires clés-valeurs en moins d'une heure, en se basant sur le bibliothèques Nanomsg et LightningDB.
This describes a Functional Programming approach to computing AWS Glacier "tree hash" values, hiding the tail-call elimination in Perl5 with a keyword and also shows how to accomplish the same result in Perl6.
This was the talk actually given at YAPC::NA 2016 by Dr. Conway and myself.
Starting with the system calll "getrusage", this returns synchronous, process-level information, mainly max RSS used. This talk describes the output from getrusage, the rusage formatting utility in ProcStats, and several examples of using it to examine time and memory use.
Optional first & final outputs to give baseline and total status, differencing avoids extraneous output, and user messages allow arbitrary stat's and tracking content.
The combination makes this nice for tracking both long-lived and shorter, more intensive processing.
Redis & ZeroMQ: How to scale your applicationrjsmelo
Presented at #PHPLX 11 July 2013
When you need to do some heavy processing how do you scale you application?
You can use Redis and ZeroMQ to leverage the heavy work for you!
With this presentation we will know more about this two technologies and how they can be used to help solve problems with the performance and scalability of your application.
Slide utilisé lors du Meetup du 16 juin 2017 organisé par l'AFUP Montpellier
Présentation des PHP Standards Recommendations (PSR). Leurs buts et l'avantage de les utiliser
Some techniques from the heady world of Functional Programming implemented in idiomatic Perl using various techniques: closures, iterators, Devel::Declare, and some distilled evil. New version now with monads! (As presented at http://conferences.yapceurope.org/lpw2008/ )
Using Mikko Koppanen's PHP ZMQ extension we will look at how you can easily distribute work to background processes, provide flexible service brokering for your next service oriented architecture, and manage caches efficiently and easily with just PHP and the ZeroMQ libraries. Whether the problem is asynchronous communication, message distribution, process management or just about anything, ZeroMQ can help you build an architecture that is more resilient, more scalable and more flexible, without introducing unnecessary overhead or requiring a heavyweight queue manager node.
Perl6 regular expression ("regex") syntax has a number of improvements over the Perl5 syntax. The inclusion of grammars as first-class entities in the language makes many uses of regexes clearer, simpler, and more maintainable. This talk looks at a few improvements in the regex syntax and also at how grammars can help make regex use cleaner and simpler.
Conférence données à l'Open World Forum, 05 octobre 2013.
Comment créer une base de données noSQL par paires clés-valeurs en moins d'une heure, en se basant sur le bibliothèques Nanomsg et LightningDB.
This describes a Functional Programming approach to computing AWS Glacier "tree hash" values, hiding the tail-call elimination in Perl5 with a keyword and also shows how to accomplish the same result in Perl6.
This was the talk actually given at YAPC::NA 2016 by Dr. Conway and myself.
Starting with the system calll "getrusage", this returns synchronous, process-level information, mainly max RSS used. This talk describes the output from getrusage, the rusage formatting utility in ProcStats, and several examples of using it to examine time and memory use.
Optional first & final outputs to give baseline and total status, differencing avoids extraneous output, and user messages allow arbitrary stat's and tracking content.
The combination makes this nice for tracking both long-lived and shorter, more intensive processing.
The new standard for C++ language has been signed in 2011. This new (extended) language, called C++11, has a number of new semantics (in terms of language constructs) and a number of new standard library support. The major language extensions are discussed in this presentation. The library will be taken up in a later presentation.
C & C++ Training Centre in Ambala! BATRA COMPUTER CENTREjatin batra
Are you in search of C & C++ Training in Ambala? Now your search ends here.. BATRA COMPUTER CENTRE provides best training in:Basics of Computer, HTML,PHP,WebDesigning
Web Development , SEO, SMO and So many other courses are available here.
This Powerpoint presentation covers following topics of C Plus Plus:
Features of OOP
Classes in C++
Objects & Creating the Objects
Constructors & Destructors
Friend Functions & Classes
Static data members & functions
Fix assembly Code new peoblem on call printf gt .pdfrchopra4
//Fix assembly Code
//new peoblem on "call printf" -->
/**************************************************************/
section .data
fmt: db "%ld", 10, 0 ; format string for printf
section .text
global fib
fib:
push rbp ; save base pointer
mov rbp, rsp ; set base pointer to current stack pointer
sub rsp, 16 ; allocate 16 bytes of space on the stack
cmp rdi, 2 ; compare argument with 2
jle .base_case ; jump to base case if argument is less than or equal to 2
mov rax, rdi ; move argument into rax
sub rax, 1 ; decrement argument by 1
mov rdi, rax ; move new argument into rdi
call fib ; recursive call to fib with new argument
mov qword [rsp], rax ; save the value of rax on the stack
mov rax, qword [rsp] ; move the previous result (from the stack) into rax
mov rbx, rdi ; move argument into rbx
sub rbx, 2 ; decrement argument by 2
mov rdi, rbx ; move new argument into rdi
call fib ; recursive call to fib with new argument
mov qword [rsp+8], rax ; save the value of rax on the stack
mov rax, qword [rsp] ; move the previous result (from the stack) into rax
add rax, qword [rsp+8] ; add the two previous results (on the stack) together
jmp .exit ; jump to the exit
.base_case:
mov rax, 1 ; set rax to 1 (base case value)
.exit:
add rsp, 16 ; deallocate the stack space
pop rbp ; restore base pointer
ret ; return to the calling function
global main
main:
push rbp ; save base pointer
mov rbp, rsp ; set base pointer to current stack pointer
sub rsp, 16 ; allocate 16 bytes of space on the stack
mov edi, 10 ; move 10 (the argument) into edi
call fib ; call the fib function with the argument
mov rsi, rax ; move the result into rsi
mov rdi, fmt ; move the format string into rdi
mov rax, 0 ; set rax to 0 (for printf)
call printf
add rsp, 16 ; deallocate the stack space
pop rbp ; restore base pointer
ret ; return to the operating system.
Write an MPI program that implements a shell-sort like parallel algo.pdfbharatchawla141
What high-level position manager is responsible for working with the CEO and company
president to determine the company\'s competitive strategy?
Solution
Answer:
Responsibilities of a high-level position manager working with the CEO and company president
to determine company\'s competitive strategy are as below-
(1) To make available company\'s financial on time to CEO and company president.
(2) To make them aware about the employees\' performance and satisfaction level.
(3) To request for change in practices and policies of company for betterment of company.
(4) To make them aware about competitor\'s product, services and practices.
(5) To implement decision taken by CEO/President in the meeting.
(6) To present competitive analysis of market share, price of product, services offered by the
company.
(7) To answer all the queries asked by CEO/President in timely and correct manner.
(8) To give proper updation about competitors new strategy, their new policies and impact of
those on company.
(9) To actively participate in making company\'s strategy with CEO and company president.
(10) To ask questions raised by the employees/customers/suppliers etc. for company\'s product
and services..
Sergi Álvarez & Roi Martín - Radare2 Preview [RootedCON 2010]RootedCON
Hace aproximadamente 1 año empezó radare2, un desarrollo paralelo a radare, orientado a ofrecer una API genérica y simple para C, Vala, Genie, python, perl y ruby con el fin de mantener el mínimo de código y presentar un acceso genérico a backends de debugging, formato de fichero, arquitectura, etc.
El framework facilita el uso de plugins o scripting para usar diversos backends de ensamblar/desensamblar, analizar cabeceras, emular, depurar, analizar código, buscar patrones, secuencias binarias entre otras.
Diseñado para ser portable entre múltiples arquitecturas y sistemas operativos, entre ellos, Linux, BSD, Solaris, Windows, x86-32/64, ARM, PowerPC y MIPS.
En la charla se presentará el conjunto de librerías y ejemplos prácticos de uso de esta herramienta.
Lisp Macros in 20 Minutes (Featuring Clojure)Phil Calçado
"We just started holding 20 minutes presentations during lunch time in the ThoughtWorks Sydney office. For the first session I gave a not-that-short talk on Lisp macros using Clojure. The slides are below.
It turns out that 20 minutes is too little time to actually acquire content but I think at least we now have some people interested in how metaprogramming can be more than monkey patching."
http://fragmental.tw/2009/01/20/presentation-slides-macros-in-20-minutes/
Presentation on native interfaces for the R programming language given as part of a course in advanced R programming at FHCRC:
https://secure.bioconductor.org/SeattleMay10/
Introduction to Lisp. A survey of lisp's history, current incarnations and advanced features such as list comprehensions, macros and domain-specific-language [DSL] support.
Land of Pyramids, Petra, and Prayers - Egypt, Jordan, and Israel Tourppd1961
This is the presentation of photos and history of Land of Pyramids, Petra, and Prayers from our Egypt, Jordan, and Israel Tour during February, 2020. This was prepared and presented to the family and friends on 19th July, 2020.
This is an overview of C++ (based on 1999 / 2003 standard) and its use in Object Oriented Programming. The presentation assumes that the audience knows C programming.
This presentation was made in PRISM workshop on Technology Innovations and Trends in IT in the second decade of 21st century. The agenda is from IEEE Computer Society.
This presentation as made as a tutorial at NCVPRIPG (http://www.iitj.ac.in/ncvpripg/) at IIT Jodhpur on 18-Dec-2013.
Kinect is a multimedia sensor from Microsoft. It is shipped as the touch-free console for Xbox 360 video gaming platform. Kinect comprises an RGB Camera, a Depth Sensor (IR Emitter and Camera) and a Microphone Array. It produces a multi-stream video containing RGB, depth, skeleton, and audio streams.
Compared to common depth cameras (laser or Time-of-Flight), the cost of a Kinect is quite low as it uses a novel structured light diffraction and triangulation technology to estimate the depth. In addition, Kinect is equipped with special software to detect human figures and to produce its 20-joints skeletons.
Though Kinect was built for touch-free gaming, its cost effectiveness and human tracking features have proved useful in many indoor applications beyond gaming like robot navigation, surveillance, medical assistance and animation.
This is Work-In-Progress. Developing a series of lectures on C++0x. This will augment my presentations on C++ and Design Pattern. First trial run was done at Interra, Noida in 2009
1. Function Call Optimization
This note describes the observations on the following Function Calls:
1. Constructor call
2. Constructor call of Base Class
3. Get / Set Methods.
To Test for the above a sample Base Class has been developed.
class Base
{
public:
size_t nameLen;
char *name;
protected:
Base(char *nameStr):
nameLen((nameStr)? strlen(nameStr): 0),
name(strcpy(new char[nameLen+1], nameStr))
{}
…
};
This generates the following assembly in debug build using g++. The function calls
have been marked in red.
_ZN4BaseC2EPc: => Base::Base()
.LFB1443:
.loc 3 17 0
pushq %rbp #
.LCFI22:
movq %rsp, %rbp #,
.LCFI23:
pushq %rbx #
.LCFI24:
subq $40, %rsp #,
.LCFI25:
movq %rdi, -16(%rbp) # this, this
movq %rsi, -24(%rbp) # nameStr, nameStr
.LBB13:
.loc 3 20 0
movq -16(%rbp), %rax # this,
movq %rax, -32(%rbp) #,
cmpq $0, -24(%rbp) #, nameStr
je .L39 #,
movq -24(%rbp), %rdi # nameStr, nameStr
call strlen # => strlen()
movq %rax, -40(%rbp) # tmp61,
jmp .L40 #
.L39:
movq $0, -40(%rbp) #,
2. .L40:
movq -40(%rbp), %rax #,
movq -32(%rbp), %rdx #,
movq %rax, (%rdx) #, <variable>.nameLen
movq -16(%rbp), %rbx # this, this
movq -16(%rbp), %rax # this, this
movq (%rax), %rdi # <variable>.nameLen, tmp63
incq %rdi # tmp63
call _Znam # => operator new()
movq %rax, %rdi #, tmp65
movq -24(%rbp), %rsi # nameStr, nameStr
call strcpy # => strcpy()
movq %rax, 8(%rbx) #, <variable>.name
.LBE13:
addq $40, %rsp #,
popq %rbx #
leave
ret
The Derived Class,
class Derived: public Base
{
Base *myBase;
public:
Derived(char *name):
Base(name),
myBase((Base*)this)
{}
…
};
generates the following assembly:
_ZN7DerivedC1EPc: => Derived::Derived()
.LFB1452:
.loc 3 53 0
pushq %rbp #
.LCFI19:
movq %rsp, %rbp #,
.LCFI20:
subq $16, %rsp #,
.LCFI21:
movq %rdi, -8(%rbp) # this, this
movq %rsi, -16(%rbp) # name, name
.LBB12:
.loc 3 56 0
movq -16(%rbp), %rsi # name, name
movq -8(%rbp), %rdi # this, this
call _ZN4BaseC2EPc # => Base::Base()
movq -8(%rbp), %rdx # this, this
movq -8(%rbp), %rax # this, this
movq %rax, 16(%rdx) # this, <variable>.myBase
.LBE12:
leave
ret
Finally, the instantiation of a derived Class Object as in
char *s; Derived d(s);
3. generates:
.loc 2 8 0
movq -24(%rbp), %rsi # s, s
leaq -64(%rbp), %rdi #, tmp59
.LEHB0:
call _ZN7DerivedC1EPc # => Derived::Derived()
This means that the functions are called respectively as we had expected.
Building the instantiation in release mode, we see the following:
.LCFI2:
testq %rdi, %rdi # s
movq %rsp, %rbp #, tmp114
je .L3 #,
call strlen # => strlen()
.L3:
.L5:
leaq 1(%rax), %rdi #, tmp67
movq %rax, (%rbp) # tmp63, <variable>.nameLen
.LEHB0:
call _Znam # => operator new()
.LEHE0:
movq %rbx, %rsi # s, nameStr
movq %rax, %rdi #, <anonymous>
call strcpy # => strcpy()
movq %rax, 8(%rbp) # tmp70, <variable>.name
movq 8(%rsp), %rdi # <variable>.name,
<variable>.name
movq %rbp, 16(%rbp) # tmp114, <variable>.myBase
testq %rdi, %rdi # <variable>.name
jne .L44 #,
Thus we see that the Derived (and Base) Constructor calls have been totally
optimized.
The above is illustrated in terms of the constructors. Similar optimizations do
(mostly) take place for (non-virtual) destructors, copy constructor, copy assignment
operator, all non-virtual inline member functions and all inline global functions.
Only virtual member functions are not inlined as their call sequence is runtime
dependent.
The same behavior is observed in case of Get / Set Methods.
4. class Base
{
…
char *GetName() const { return name; }
void SetName(char *nameStr)
{
if (nameStr)
{
if (name)
{
delete [] name;
}
name =
strcpy(new char[strlen(nameStr)+1], nameStr);
}
}
…
};
The assemblies for the Get / Set Methods are shown below: