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/* s_floorl.c -- long double version of s_floor.c.

 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.

 */

/*

 * ====================================================

 * 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.

 * ====================================================

 */

#include "quadmath-imp.h"

static const __float128 huge = 1.0e4930Q;

__float128

floorq (__float128 x)

{

        int64_t i0,i1,j0;

        uint64_t i,j;

        GET_FLT128_WORDS64(i0,i1,x);

        j0 = ((i0>>48)&0x7fff)-0x3fff;

        if(j0<48) {

            if(j0<0) {   /* raise inexact if x != 0 */

                if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */

                    if(i0>=0) {i0=i1=0;}

                    else if(((i0&0x7fffffffffffffffLL)|i1)!=0)

                        { i0=0xbfff000000000000ULL;i1=0;}

                }

            } else {

                i = (0x0000ffffffffffffULL)>>j0;

                if(((i0&i)|i1)==0) return x; /* x is integral */

                if(huge+x>0.0) {        /* raise inexact flag */

                    if(i0<0) i0 += (0x0001000000000000LL)>>j0;

                    i0 &= (~i); i1=0;

                }

            }

        } else if (j0>111) {

            if(j0==0x4000) return x+x;  /* inf or NaN */

            else return x;              /* x is integral */

        } else {

            i = -1ULL>>(j0-48);

            if((i1&i)==0) return x;      /* x is integral */

            if(huge+x>0.0) {            /* raise inexact flag */

                if(i0<0) {

                    if(j0==48) i0+=1;

                    else {

                        j = i1+(1LL<<(112-j0));

                        if(j<i1) i0 +=1 ;       /* got a carry */

                        i1=j;

                    }

                }

                i1 &= (~i);

            }

        }

        SET_FLT128_WORDS64(x,i0,i1);

        return x;

}