author | Marcel Hlopko <marcel.hlopko@gmail.com> |
Thu, 19 Sep 2013 23:24:00 +0200 | |
branch | development |
changeset 2752 | e3092c16bcce |
parent 2380 | 9195eccdcbd9 |
permissions | -rw-r--r-- |
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/* @(#)s_nextafter.c 1.3 95/01/18 */ |
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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 SunSoft, 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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|
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/* IEEE functions |
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* nextafter(x,y) |
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* return the next machine floating-point number of x in the |
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* direction toward y. |
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* Special cases: |
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*/ |
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|
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#include "fdlibm.h" |
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|
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#ifdef __STDC__ |
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double nextafter(double x, double y) |
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#else |
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double nextafter(x,y) |
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double x,y; |
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#endif |
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{ |
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int hx,hy,ix,iy; |
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unsigned lx,ly; |
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|
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hx = __HI(x); /* high word of x */ |
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lx = __LO(x); /* low word of x */ |
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hy = __HI(y); /* high word of y */ |
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ly = __LO(y); /* low word of y */ |
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ix = hx&0x7fffffff; /* |x| */ |
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iy = hy&0x7fffffff; /* |y| */ |
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|
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if(((ix>=0x7ff00000)&&((ix-0x7ff00000)|lx)!=0) || /* x is nan */ |
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((iy>=0x7ff00000)&&((iy-0x7ff00000)|ly)!=0)) /* y is nan */ |
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return x+y; |
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if(x==y) return x; /* x=y, return x */ |
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if((ix|lx)==0) { /* x == 0 */ |
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__HI(x) = hy&0x80000000; /* return +-minsubnormal */ |
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__LO(x) = 1; |
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y = x*x; |
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if(y==x) return y; else return x; /* raise underflow flag */ |
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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 -= 1; |
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lx -= 1; |
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} else { /* x < y, x += ulp */ |
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lx += 1; |
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if(lx==0) hx += 1; |
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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 -= 1; |
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lx -= 1; |
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} else { /* x > y, x += ulp */ |
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lx += 1; |
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if(lx==0) hx += 1; |
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} |
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} |
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hy = hx&0x7ff00000; |
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if(hy>=0x7ff00000) return x+x; /* overflow */ |
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if(hy<0x00100000) { /* underflow */ |
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y = x*x; |
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if(y!=x) { /* raise underflow flag */ |
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__HI(y) = hx; __LO(y) = lx; |
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return y; |
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} |
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} |
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__HI(x) = hx; __LO(x) = lx; |
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return x; |
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} |