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71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/* nextafterq.c -- __float128 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 <errno.h>
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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) {
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__float128 u = x + x; /* overflow */
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math_force_eval (u);
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errno = ERANGE;
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}
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if(hy==0) {
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__float128 u = x*x; /* underflow */
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math_force_eval (u); /* raise underflow flag */
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errno = ERANGE;
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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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