The gcc compiler can recognize the function semantics of free and make optimizations. Why and how does it do it?
In the following code, apb and apb->amp are both pointers, pointing to a malloc address.
The phenomenon is that apb->amp=NULL will be optimized and will not be executed, but when I remove free(apb), the assignment to apb->amp will not be optimized.
how can I enable a specific set of gcc optimizations?
gcc has a large number of optimization methods, some of which correspond to command line options beginning with -f. Is there a way to enable some specific set of these and no others?
GCC optimizes x + n > y as x + (n-1) >= y?
In general, the program
Extern (global) variable not optimized out
Why does GCC compiler optimize out variable foo entirely?
Is initializing a POD (pointer) member variable inside constructor body (but before first use) an undefined behavior?
Let’s say we have a code like this:
C++: is initializing a POD (pointer) member variable inside constructor body (but before first use) an undefined behavior?
Let’s say we have a code like this: