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In a statement such as while ((ch = getchar ())!= EOF) {…}, the return value of a function is used to control a loop while assigning that same value to a variable. In other programming languages, Scheme for example, the return value of an assignment is undefined and such idioms are invalid.
In C and C++, return exp; (where exp is an expression) is a statement that tells a function to return execution of the program to the calling function, and report the value of exp. If a function has the return type void, the return statement can be used without a value, in which case the program just breaks out of the current function and ...
Typically, this means returning multiple results in a register (as opposed to returning a pointer to a tuple allocated on the heap whose components are the function's multiple return values.) CPR analysis was introduced in the context of compiling Haskell (a lazy functional language) and is implemented in the Glasgow Haskell Compiler.
How return values are delivered from the callee back to the caller. Options include on the stack, in a register, or reference to something allocated on the heap. How long or complex values are handled, perhaps by splitting across multiple registers, within the stack frame, or with reference to memory.
For example, if one defines the add subroutine as def add(x, y): return x + y, then x, y are parameters, while if this is called as add(2, 3), then 2, 3 are the arguments. Variables (and expressions thereof) from the calling context can be arguments: if the subroutine is called as a = 2; b = 3; add(a, b) then the variables a, b are the ...
That is, where an unfused multiply–add would compute the product b × c, round it to N significant bits, add the result to a, and round back to N significant bits, a fused multiply–add would compute the entire expression a + (b × c) to its full precision before rounding the final result down to N significant bits.
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Assign a data type to the return value, if any; Specify a return value in the function body; Call a function; Provide actual parameters that correspond to a called function's formal parameters; Return control to the caller at the point of call; Consume the return value in the caller; Dispose of the values returned by a call