Question

How I can setup the compiler to generate identical code? For example:

inline bool iszero(int a)
{
    return (a == 0);
}

int main()
{
    int a = 4;

    if(a == 0) // First
        a = 5;

    if(iszero(a)) // Second
        a = 5;

    ///...
}

In debug mode (with inlining) disassembled code look like:

if(a == 0) // First
     a = 5;

bool temp; // Second
if(a == 0)
    temp = 0;
else
    temp = 1;

if(temp == 0)
    a = 5;

Why that happens?

Why this question has been asked? I need to debug my application with inlining functions (for speed up debug) and I do not want to lose performance in debug mode.

Answer 1

Compile in release mode, with full optimizations. The generated code will be the equivalent of:

int main()
{
}

There’s no point in comparing code with no optimizations on, as there’s no point in benchmarking with optimizations off.