#include "duk_internal.h"

Functions
DUK_INTERNAL int	duk_repl_fpclassify (double x)

DUK_INTERNAL int	duk_repl_signbit (double x)

DUK_INTERNAL int	duk_repl_isfinite (double x)

DUK_INTERNAL int	duk_repl_isnan (double x)

DUK_INTERNAL int	duk_repl_isinf (double x)

Function Documentation

◆ duk_repl_fpclassify()

DUK_INTERNAL int duk_repl_fpclassify ( double x )

Definition at line 20 of file duktape-1.8.0/src-separate/duk_replacements.c.

                                               {
    duk_double_union u;
    duk_uint_fast16_t expt;
    duk_small_int_t mzero;
 
    u.d = x;
    expt = (duk_uint_fast16_t) (u.us[DUK_DBL_IDX_US0] & 0x7ff0UL);
    if (expt > 0x0000UL && expt < 0x7ff0UL) {
        /* expt values [0x001,0x7fe] = normal */
        return DUK_FP_NORMAL;
    }
 
    mzero = (u.ui[DUK_DBL_IDX_UI1] == 0 && (u.ui[DUK_DBL_IDX_UI0] & 0x000fffffUL) == 0);
    if (expt == 0x0000UL) {
        /* expt 0x000 is zero/subnormal */
        if (mzero) {
            return DUK_FP_ZERO;
        } else {
            return DUK_FP_SUBNORMAL;
        }
    } else {
        /* expt 0xfff is infinite/nan */
        if (mzero) {
            return DUK_FP_INFINITE;
        } else {
            return DUK_FP_NAN;
        }
    }
}

References duk_double_union::d, DUK_FP_INFINITE, DUK_FP_NAN, DUK_FP_NORMAL, DUK_FP_SUBNORMAL, DUK_FP_ZERO, duk_double_union::ui, and duk_double_union::us.

◆ duk_repl_isfinite()

DUK_INTERNAL int duk_repl_isfinite ( double x )

Definition at line 60 of file duktape-1.8.0/src-separate/duk_replacements.c.

                                             {
    int c = DUK_FPCLASSIFY(x);
    if (c == DUK_FP_NAN || c == DUK_FP_INFINITE) {
        return 0;
    } else {
        return 1;
    }
}

References DUK_FP_INFINITE, DUK_FP_NAN, and DUK_FPCLASSIFY.

◆ duk_repl_isinf()

DUK_INTERNAL int duk_repl_isinf ( double x )

Definition at line 78 of file duktape-1.8.0/src-separate/duk_replacements.c.

                                          {
    int c = DUK_FPCLASSIFY(x);
    return (c == DUK_FP_INFINITE);
}

References DUK_FP_INFINITE, and DUK_FPCLASSIFY.

◆ duk_repl_isnan()

DUK_INTERNAL int duk_repl_isnan ( double x )

Definition at line 71 of file duktape-1.8.0/src-separate/duk_replacements.c.

                                          {
    int c = DUK_FPCLASSIFY(x);
    return (c == DUK_FP_NAN);
}

References DUK_FP_NAN, and DUK_FPCLASSIFY.

◆ duk_repl_signbit()

DUK_INTERNAL int duk_repl_signbit ( double x )

Definition at line 52 of file duktape-1.8.0/src-separate/duk_replacements.c.

                                            {
    duk_double_union u;
    u.d = x;
    return (int) (u.uc[DUK_DBL_IDX_UC0] & 0x80UL);
}