s_floor.c

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Author : David Ludwig
Date : 2014-12-03 10:55:23
Hash : 70438be2
Message : WinRT: fixed bug whereby SDL would override an app's default orientation WinRT apps can set a default, preferred orientation via a .appxmanifest file. SDL was overriding this on app startup, and making the app use all possible orientations (landscape and portrait). Thanks to Eric Wing for the heads up on this!

src/libm/s_floor.c

/* @(#)s_floor.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#if defined(LIBM_SCCS) && !defined(lint)
static const char rcsid[] =
    "$NetBSD: s_floor.c,v 1.8 1995/05/10 20:47:20 jtc Exp $";
#endif

/*
 * floor(x)
 * Return x rounded toward -inf to integral value
 * Method:
 *	Bit twiddling.
 * Exception:
 *	Inexact flag raised if x not equal to floor(x).
 */

#include "math_libm.h"
#include "math_private.h"

#ifdef __STDC__
static const double huge_val = 1.0e300;
#else
static double huge_val = 1.0e300;
#endif

libm_hidden_proto(floor)
#ifdef __STDC__
     double floor(double x)
#else
     double floor(x)
     double x;
#endif
{
    int32_t i0, i1, j0;
    u_int32_t i, j;
    EXTRACT_WORDS(i0, i1, x);
    j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
    if (j0 < 20) {
        if (j0 < 0) {           /* raise inexact if x != 0 */
            if (huge_val + x > 0.0) {       /* return 0*sign(x) if |x|<1 */
                if (i0 >= 0) {
                    i0 = i1 = 0;
                } else if (((i0 & 0x7fffffff) | i1) != 0) {
                    i0 = 0xbff00000;
                    i1 = 0;
                }
            }
        } else {
            i = (0x000fffff) >> j0;
            if (((i0 & i) | i1) == 0)
                return x;       /* x is integral */
            if (huge_val + x > 0.0) {       /* raise inexact flag */
                if (i0 < 0)
                    i0 += (0x00100000) >> j0;
                i0 &= (~i);
                i1 = 0;
            }
        }
    } else if (j0 > 51) {
        if (j0 == 0x400)
            return x + x;       /* inf or NaN */
        else
            return x;           /* x is integral */
    } else {
        i = ((u_int32_t) (0xffffffff)) >> (j0 - 20);
        if ((i1 & i) == 0)
            return x;           /* x is integral */
        if (huge_val + x > 0.0) {   /* raise inexact flag */
            if (i0 < 0) {
                if (j0 == 20)
                    i0 += 1;
                else {
                    j = i1 + (1 << (52 - j0));
                    if (j < (u_int32_t) i1)
                        i0 += 1;        /* got a carry */
                    i1 = j;
                }
            }
            i1 &= (~i);
        }
    }
    INSERT_WORDS(x, i0, i1);
    return x;
}

libm_hidden_def(floor)

kc3-lang/SDL/src/libm/s_floor.c

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kc3-lang/SDL /src/libm/s_floor.c