If execution speed is important, should I use this,
struct myType {
float dim[3];
};
myType arr[size];
or to use a 2D array as arr[size][index]
If execution speed is important, should I use this, struct myType { float dim[3];
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If execution speed is important, should I use this,
struct myType {
float dim[3];
};
myType arr[size];
or to use a 2D array as arr[size][index]
It depends on your use case. If you use the three dimensions typically together, the struct organization can be reasonable. Especially when using the dimension individually the array layout is most likely to give better performance: contemporary processors don’t just load individual words but rather units of cache lines. If only parts of the data is used there are words loaded which aren’t used.
The array layout is also more accessible to parallel processing e.g. using SIMD operations. This is unfortunate to some extend because the object layout is generally different. Actually, the arrays you are using are probably similar but if you change things to become
float array[3][size]things become different.