By Jon Louis Bentley
Classing programming textual content from Jon Bentley, the writer of Programming Pearls. just about 40 years later, pro programmers will nonetheless locate many juicy nuggets during this book.
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Y-Th i sY ) ; i f Th i sD i s t < C l o s e D i s t t h e n begin C l o se P t : = I ; C l os eD i s t Th i sD i s t e nd e nd end ; · - Fragment AS . Remove UnVisited array. We now have a fast program. All that usually happens in each iteration of the inner loop is an array access, a subtraction, a multiplication , and a com parison, all of which seem necessary. The only overhead that does not perform a useful service is that of the fo r statement itself, which we will now try to eliminate. There are two aspects of the fo r statement: it increments I and tests to see whether I equals the termination value .
Brailsford, Foxley , Mander, and ' Morgan [ 1 977] describe such a system for the Algol 68 language , Matwin and Missala [ 1 976] describe a machine-independent profiling sys tem for Pascal , and Kernighan and Plauger [ 1 976 , Exercise 9-22] give some general hints for building such tools. • As a simple last resort, it is usually easy to augment a program with timing statements that access a global system clock . To measure a routine ' s time we store the current time, call the routine, and when control is returned subtract the stored time from the current time , giving the time spent in the routine.
The built-in function ''maxreal" is replaced by "10000000000". *** References to PtArr are replaced by IntArr. e nd ; Fragment A7. Convert reals to integers . Because real arithmetic is faster than integer arithmetic on some systems , the above change could actually decrease the program's performance o n some architectures , while on other machines (especially minis and micros) it could lead SEC. 2 A SEQUENCE OF PASCAL CODE FRAGM ENTS 23 to a savings of one or two orders of magnitude . Regardless of that possible savings, though , Fragment A 7 points out another opportunity for time savings: we can now remove the level of indire�tion imposed by the Un V i s array.