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multiple implementations that provide different levels of cost and performance can be simultaneously developed A program only needs to be developed once for that ISA, and then it can run on all these implementations Such program portability significantly reduces the cost of software development and increases the longevity of software Ujrfortunately this same benefit also makes migration to a a i e w ISAvery difficult Successful ISAs, or more specifically ISAs with a large software instafledbase, tend to stay around for quite a while Two examples are the IBM 360/370 and the Intel IA32 Besides serving as a reference targeted by software developers or compilers, ISA serves as the specification for processor designers Microprocessor design starts with the ISA and produces a microarchitecture that meets this specification Every new microarchitecture must be validated against the ISA to ensure that it performs the functional requirements specified by the ISA This is extremely important to ensure that existing software can run correctly on the new microarchitecture Since the advent of computers, a wide variety of ISAs have been developed and used They differ in how operations and operands are specified Typically an ISA defines a set of instructions called assembly instructions Each instruction specifies an operation and one or more operands Each ISA uniquely defines_an_ assemblzJangugge An assembly language program constitutes a sequence of assembly instructions ISAs have beenjhfferentiated according to tie_Jwmber_oi operands that can be explicitly specified in eacli Instruction, for example twoadd>ess~cFthree^lito use an accumulator as an implicit operand In an accumulator-based architecture, the accumulator is used as an implicit source operand and the destination Other early ISAs assume that operands are stored in a stack [last in, first out (LIFO)] structure and operations are performed on the top one or two entries of the stack Most modemJSAs assume that operands are stored Jn^ajnultifintry xegister_fi!e, and jhjtfjdUuitlunetic and logical operations are performed on operands stored in the registers Special mstfiictions; sucITasToaTaHd store instmctions^ajre d e v i s e d j o ^ m p j ' e ^ r ^ a n d s BefweeiTthe regTstei fileand the main memory^ Some traditional ISAs allow operands to come directly from both the register file and the main memory ~ ISAs tend to evolve very slowly due to the inertia against recompiling or redeveloping software Typically a twofold performance increase is needed before software developers will be willing to pay the overhead to recompile their existing applications While new extensions to an existing ISA can occur from time to time to accommodate new emerging applications, the introduction of a brand new ISA is a tall order The development of effective compilers and operating systems for a new ISA can take on the order of UH- years The longer an ISA has been in existence and the larger the installed base of software based on that ISA, the more difficult it is to replace that ISA One possible exception might be in certain special application domains where a specialized new ISA might be able to provide signif\ icant performance boost, such as on the order of 10-fold r~ Unlike the glacial creep of ISA innovations, significantly new microarchitectures j ^ c a n be and have been developed every 3 to 5 years During the 1980s, there were widespread interests in ISA design and passionate debates about what constituted the.

#include <stdio.h> int main (int argc, const char * argv[]) { int number, sum; sum = 0; for ( number=1; number<=10; number++ ) { sum += number; } printf( "The sum of the numbers from 1 to 10 is %d.", sum ); return 0; }

If this program doesn t mean anything to you, don t panic. Just keep reading. By the time you finish reading this book, you ll be writing C code like a pro. In case you were wondering, here s what appeared in the console window when we ran this program:

PCs today are used more than ever for storage of digital photographs, music, and video, in addition to more traditional types of data Even a modest collection of MP3 les, family photos, and home video clips requires many gigabytes of space! Hard drives do have space limits, and at some point they tend to fail, so wise PC users turn to recordable CDs, DVDs, and Blu-ray drives These discs provide an affordable large-capacity portable storage option; you can put your important data onto a disc, or make multiple copies of that disc to store in two or more secure locations This lab will introduce you to the process of recording, or burning, optical discs Rather than burning a disc full of your favorite tunes or photos, you ll be making the type of disc that a technician would have in his toolkit when troubleshooting a machine that won t boot

Programming 17 Some Alternatives to C 18 What About Objective-C, C++, and Java 18 What s the Best Language for Programming the Mac or iPhone 20 The Programming Process 20 Source Code 21 Compiling Your Source Code 22 What s Next 24.

C Functions 25 The Function Definition 26 Syntax Errors and Algorithms 27 Calling a Function 29 A Brief History of C 32 The Standard Library 33 Exploring Unix and Your Mac s Built-In Manual 34 Same Program, Two Functions 36 The hello2 Project 37 The hello2 Source Code 40 Running hello2 42 Let s Do That Again, Again, Again 43 Generating Some Errors 44 C Is Case Sensitive 47 What s Next 47.