compiler-optimization Archives

[Solved] How does GCC store member functions in memory?

January 14, 2023 by Kirat

For the purpose of in-memory data representation, a C++ class can have either plain or static member functions, or virtual member functions (including some virtualdestructor, if any). Plain or static member functions do not take any space in data memory, but of course their compiled code take some resource, e.g. as binary code in the … Read more

[Solved] GCC compiler wrong optimization

November 15, 2022 by Kirat

Here is a version of your code which doesn’t break aliasing rules: class Foo { public: Foo() : userData(0L) { } long userData; }; void Destroy(Foo* pFoo) { if (–pFoo->userData <= 0) { delete pFoo; } } int main() { int i = 0; while (i < 10) { Foo* pFoo = new Foo(); pFoo->userData … Read more