[Bug middle-end/55498] [devirt] trunk fails inline-devirt test #6

[matt at use dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55498

--- Comment #3 from Matt Hargett <matt at use dot net> 2013-02-11 02:11:36 UTC ---
Just tested with latest trunk and things have regressed/changed a bit. This is
another test case where I *have* to use both -O3 and -funroll-loops to get the
desired effect. This didn't use to be the case. Also, even at -O3 the indirect
references to one() and two() are inlined, but the actual immediates returned
by those functions is not.

#include <stdio.h>

typedef unsigned char(*Calculable)(void);
typedef Calculable(*CalculateStrategy)(void);

unsigned char one() { return 1; }
Calculable oneStrategy() { return one; }
unsigned char two() { return 2; }
Calculable twoStrategy() { return two; }

static void print(CalculateStrategy calculateStrategy)
{
        printf("%d\n", calculateStrategy()());
        printf("+1: %d\n", calculateStrategy()() + 1);
}

int main()
{
        for (int i = 3; i > 0; i--) {
                print(oneStrategy);
                print(twoStrategy);
        }

        return 0;
}