By Harriet Gecks.
ISBN-10: 9380168489
ISBN-13: 9789380168487
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Extra resources for Optimizing C++
Example text
For example, instead of the following code: if (a[i] == 1) f(); else if (a[i] == 2) g(); else if (a[i] == 5) h(); write the following code: switch (a[i]) { case 1: f(); break; case 2: g(); break; case 5: h(); break; } Compilers may exploit the regularity of switch statements to apply some optimizations, in particular if the guideline "Case values for switch statements" in this section is applied. Case values of switch statements As constants for switch statements cases, use compact sequences of values, that is sequences with no gaps or with few small gaps.
3. Instruction count Even the language features that generate inlined code may have a significant cost, as such instruction are anyway to be executed. In this section some techniques are presented to decrease the total number of machine instructions that the processor will have to execute to perform a given operation. Cases order in switch statement In switch statements, sort the cases by decreasing probability. 1, it was already suggested to put before the most typical cases, that is those that were presumed to be more probable.
Transform the function into a constructor of the return type, taking the same function arguments. Make the function return an object of an auxiliary type, that steals the resources from the return object and passes them to the destination object, without copying their contents. Use an expression template, that is an advanced technique, part of the programming paradigm called template metaprogramming. If using the C++0x standard, use an rvalue reference. Moving declarations outside loops If a variable is declared in the body of a loop, and an assignment to it costs less than a construction plus a destruction, move that declaration before the loop.
Optimizing C++ by Harriet Gecks.
by Mark
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