/*

  This program is part of the TACLeBench benchmark suite.
  Version V 1.x

  Name: fac

  Author: unknown

  Function: fac is a program to calculate factorials.
    This program computes the sum of the factorials
    from zero to five.

  Source: MRTC
          http://www.mrtc.mdh.se/projects/wcet/wcet_bench/fac/fac.c

  Changes: CS 2006/05/19: Changed loop bound from constant to variable.

  License: public domain

*/

/*
  Forward declaration of functions
*/

// Wasm loop bounds

__attribute__((import_module("__pragma"), import_name("loopbound"))) extern void
__pragma_loopbound(unsigned int min_bound, unsigned int max_bound);

int fac_fac(int n);
void fac_init();
int fac_return();
__attribute__((noinline)) __attribute__((export_name("entrypoint"))) void
fac_main();
__attribute__((noinline)) __attribute__((export_name("main"))) int main(void);
/*
  Declaration of global variables
*/

int fac_s;
volatile int fac_n;

/*
  Initialization- and return-value-related functions
*/

void
fac_init() {
    fac_s = 0;
    fac_n = 5;
}

int
fac_return() {
    int expected_result = 154;
    return fac_s - expected_result;
}

/*
  Arithmetic math functions
*/

int
fac_fac(int n) {
    if (n == 0)
        return 1;
    else
        return (n * fac_fac(n - 1));
}

/*
  Main functions
*/

__attribute__((noinline)) __attribute__((export_name("entrypoint"))) void
fac_main() {
    int i;

    __pragma_loopbound(6, 6);
    for (i = 0; i <= fac_n; i++) {
        _Pragma("marker recursivecall") fac_s += fac_fac(i);
        _Pragma("flowrestriction 1*fac_fac <= 6*recursivecall")
    }
}

__attribute__((noinline)) __attribute__((export_name("main"))) int
main(void) {
    fac_init();
    fac_main();

    return (fac_return());
}