[Issue 3749] cannot evaluate yl2x (log) and exp functions at compile time

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http://d.puremagic.com/issues/show_bug.cgi?id=3749



--- Comment #5 from Witold Baryluk <baryluk at smp.if.uj.edu.pl> 2010-01-31 08:03:28 PST ---
Small but important error in unittest (c was not multiplied correctly. Also
-300..300 range was somehow too big, compilations was very long.

int tests(double[] xs, int min, int max) {
    assert(min <= max);
    int r = 0;
    double c = 1.0;
    if (min < 0) {
        for (int i = 0; i < -min; i++) {
            c = c / 2.0;
        }
    }
    if (min > 0) {
        for (int i = 0; i < min; i++) {
            c = c * 2.0;
        }
    }
    for (int i = min; i <= max; i++) {
        foreach (x0; xs) {
            auto x = c * x0;
            if ( (ctfe_exp(ctfe_log(x)) - x) / x < 1.0e-16 ) {
                ;
            } else {
                r = r + 1;
            }
        }
        c = c * 2.0;
    }
    return r;
}

unittest {
    enum c = tests(
        [0.1, 0.1001, 0.11, 0.2, 0.24, 0.3, 0.341, 0.387123, 0.4,
        0.5, 0.55, 0.6, 0.7, 0.732, 0.8, 0.88, 0.9, 0.98, 0.9991, 0.999992],
        -30, 30);
    static assert(c == 0);
}
static assert(ctfe_exp(0.0) == 1.0);
static assert(ctfe_exp(-1000.0) == 0.0);
static assert(ctfe_exp(1000.0) == double.infinity);
static assert(ctfe_log(0.0) == -double.infinity);

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