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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [nextafterq.c] - Blame information for rev 775

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Line No. Rev Author Line
1 740 jeremybenn
/* s_nextafterl.c -- long double version of s_nextafter.c.
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 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
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 */
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/*
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 * ====================================================
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 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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 *
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 * Developed at SunPro, a Sun Microsystems, Inc. business.
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 * Permission to use, copy, modify, and distribute this
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 * software is freely granted, provided that this notice
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 * is preserved.
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 * ====================================================
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 */
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#include "quadmath-imp.h"
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__float128
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nextafterq (__float128 x, __float128 y)
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{
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        int64_t hx,hy,ix,iy;
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        uint64_t lx,ly;
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        GET_FLT128_WORDS64(hx,lx,x);
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        GET_FLT128_WORDS64(hy,ly,y);
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        ix = hx&0x7fffffffffffffffLL;           /* |x| */
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        iy = hy&0x7fffffffffffffffLL;           /* |y| */
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        if(((ix>=0x7fff000000000000LL)&&((ix-0x7fff000000000000LL)|lx)!=0) ||   /* x is nan */
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           ((iy>=0x7fff000000000000LL)&&((iy-0x7fff000000000000LL)|ly)!=0))     /* y is nan */
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           return x+y;
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        if(x==y) return y;              /* x=y, return y */
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        if((ix|lx)==0) {                 /* x == 0 */
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            SET_FLT128_WORDS64(x,hy&0x8000000000000000ULL,1);/* return +-minsubnormal */
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            /* here we should raise an underflow flag */
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            return x;
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        }
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        if(hx>=0) {                      /* x > 0 */
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            if(hx>hy||((hx==hy)&&(lx>ly))) {    /* x > y, x -= ulp */
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                if(lx==0) hx--;
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                lx--;
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            } else {                            /* x < y, x += ulp */
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                lx++;
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                if(lx==0) hx++;
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            }
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        } else {                                /* x < 0 */
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            if(hy>=0||hx>hy||((hx==hy)&&(lx>ly))){/* x < y, x -= ulp */
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                if(lx==0) hx--;
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                lx--;
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            } else {                            /* x > y, x += ulp */
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                lx++;
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                if(lx==0) hx++;
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            }
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        }
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        hy = hx&0x7fff000000000000LL;
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        if(hy==0x7fff000000000000LL) return x+x;/* overflow  */
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        if(hy==0) {
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            /* here we should raise an underflow flag */
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        }
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        SET_FLT128_WORDS64(x,hx,lx);
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        return x;
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}

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