/* * Copyright (c) 1998, 2001, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions.
*/
/* IEEE functions * nextafter(x,y) * return the next machine floating-point number of x in the * direction toward y. * Special cases:
*/
hx = __HI(x); /* high word of x */
lx = __LO(x); /* low word of x */
hy = __HI(y); /* high word of y */
ly = __LO(y); /* low word of y */
ix = hx&0x7fffffff; /* |x| */
iy = hy&0x7fffffff; /* |y| */
if(((ix>=0x7ff00000)&&((ix-0x7ff00000)|lx)!=0) || /* x is nan */
((iy>=0x7ff00000)&&((iy-0x7ff00000)|ly)!=0)) /* y is nan */ return x+y; if(x==y) return x; /* x=y, return x */ if((ix|lx)==0) { /* x == 0 */
__HI(x) = hy&0x80000000; /* return +-minsubnormal */
__LO(x) = 1;
y = x*x; if(y==x) return y; elsereturn x; /* raise underflow flag */
} if(hx>=0) { /* x > 0 */ if(hx>hy||((hx==hy)&&(lx>ly))) { /* x > y, x -= ulp */ if(lx==0) hx -= 1;
lx -= 1;
} else { /* x < y, x += ulp */
lx += 1; if(lx==0) hx += 1;
}
} else { /* x < 0 */ if(hy>=0||hx>hy||((hx==hy)&&(lx>ly))){/* x < y, x -= ulp */ if(lx==0) hx -= 1;
lx -= 1;
} else { /* x > y, x += ulp */
lx += 1; if(lx==0) hx += 1;
}
}
hy = hx&0x7ff00000; if(hy>=0x7ff00000) return x+x; /* overflow */ if(hy<0x00100000) { /* underflow */
y = x*x; if(y!=x) { /* raise underflow flag */
__HI(y) = hx; __LO(y) = lx; return y;
}
}
__HI(x) = hx; __LO(x) = lx; return x;
}
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