C++ (Cpp) float64_is_zero Examples

Example #1

File: helper-a64.c Project: 01org/qemu-lite

float64 HELPER(vfp_mulxd)(float64 a, float64 b, void *fpstp)
{
    float_status *fpst = fpstp;

    a = float64_squash_input_denormal(a, fpst);
    b = float64_squash_input_denormal(b, fpst);

    if ((float64_is_zero(a) && float64_is_infinity(b)) ||
        (float64_is_infinity(a) && float64_is_zero(b))) {
        /* 2.0 with the sign bit set to sign(A) XOR sign(B) */
        return make_float64((1ULL << 62) |
                            ((float64_val(a) ^ float64_val(b)) & (1ULL << 63)));
    }
    return float64_mul(a, b, fpst);
}

Example #2

File: fpu_helper.c Project: frenchleaf/qemu

uint32_t set_cc_nz_f64(float64 v)
{
    if (float64_is_any_nan(v)) {
        return 3;
    } else if (float64_is_zero(v)) {
        return 0;
    } else if (float64_is_neg(v)) {
        return 1;
    } else {
        return 2;
    }
}

Example #3

File: fpu_helper.c Project: frenchleaf/qemu

/* test data class 64-bit */
uint32_t HELPER(tcdb)(CPUS390XState *env, uint32_t f1, uint64_t m2)
{
    float64 v1 = env->fregs[f1].d;
    int neg = float64_is_neg(v1);
    uint32_t cc = 0;

    HELPER_LOG("%s: v1 0x%lx m2 0x%lx neg %d\n", __func__, v1, m2, neg);
    if ((float64_is_zero(v1) && (m2 & (1 << (11-neg)))) ||
        (float64_is_infinity(v1) && (m2 & (1 << (5-neg)))) ||
        (float64_is_any_nan(v1) && (m2 & (1 << (3-neg)))) ||
        (float64_is_signaling_nan(v1) && (m2 & (1 << (1-neg))))) {
        cc = 1;
    } else if (m2 & (1 << (9-neg))) {
        /* assume normalized number */
        cc = 1;
    }
    /* FIXME: denormalized? */
    return cc;
}