When a confipote bon de reduction loop is unrolled, a loop counter needs to be updated less often and fewer branches are executed.
If you do need that kind of complete functionality, stick with the compilers floating-point library and look for other ways to speed up your program.
Pass pointers to structures instead of passing the structure itself.Note that the new version only code promo mencorner 2018 works if it is known that the range of count on input is 0-59.Reducing Memory Usage In some cases, it may be RAM rather than ROM that is the limiting factor for your application.Loop jamming Never use two loops where one will suffice.If we know it won't be altered, we could code it like this instead: void func1( int *data ) int i; int localdata; localdata *data; for(i0; i 10; i) anyfunc ( localdata, i This gives the compiler better opportunity for optimization.And if you miss just one of them, Murphys Law will come back to haunt you in the final days of your project.We should always write count-down-to-zero loops and use simple termination conditions.Due to the Memory alignment, it is possible to have dummy area within the structure.For example, early in my career I implemented a digital filtering algorithm in C and targeted it to a TI TMS320C30 DSP.And toward that end there are usually one or more development boards around, each with additional memory and/or a faster processor.For large decisions involving.
If you can cache any often used data rather than recalculating or reloading it, it will help.
Size tradeoff is encountered.
This works because it is quicker to process i- as the test condition, which says "Is i non-zero?
Constructors eliminate an entire class of C programming errors having to do with uninitialized data structures.Remember, integer arithmetic is much faster than floating-point arithmetic, as it can usually be done directly by the processor, rather than relying on external FPUs or floating point math libraries.And there are many things you can do to improve the efficiency of those sections by hand.Complex a, b, c; c operator(a, b / The traditional way: Function Call c a b; / The C way: Operator Overloading Unlike the features mentioned so far, constructors and destructors do have a slight penalty associated with them.It's easy to get caught out if your code relies on an ascending loop counter.Thanks to Timothy Prince for the note on architectures with Instruction Level Parallelism.
Suddenly something that would be a direct load from a global or static becomes very indirect; it must first load the address of the global/static into a register, then load from that, rather than just encoding the address directly in the instruction.
This optimization eliminates code that the compiler believes to be either redundant or irrelevant.