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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libm/] [common/] [sf_nextafter.c] - Rev 816
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/* sf_nextafter.c -- float version of s_nextafter.c. * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. */ /* * ==================================================== * 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 "fdlibm.h" #ifdef __STDC__ float nextafterf(float x, float y) #else float nextafterf(x,y) float x,y; #endif { __int32_t hx,hy,ix,iy; GET_FLOAT_WORD(hx,x); GET_FLOAT_WORD(hy,y); ix = hx&0x7fffffff; /* |x| */ iy = hy&0x7fffffff; /* |y| */ if(FLT_UWORD_IS_NAN(ix) || FLT_UWORD_IS_NAN(iy)) return x+y; if(x==y) return x; /* x=y, return x */ if(FLT_UWORD_IS_ZERO(ix)) { /* x == 0 */ SET_FLOAT_WORD(x,(hy&0x80000000)|FLT_UWORD_MIN); y = x*x; if(y==x) return y; else return x; /* raise underflow flag */ } if(hx>=0) { /* x > 0 */ if(hx>hy) { /* x > y, x -= ulp */ hx -= 1; } else { /* x < y, x += ulp */ hx += 1; } } else { /* x < 0 */ if(hy>=0||hx>hy){ /* x < y, x -= ulp */ hx -= 1; } else { /* x > y, x += ulp */ hx += 1; } } hy = hx&0x7f800000; if(hy>FLT_UWORD_MAX) return x+x; /* overflow */ if(hy<0x00800000) { /* underflow */ y = x*x; if(y!=x) { /* raise underflow flag */ SET_FLOAT_WORD(y,hx); return y; } } SET_FLOAT_WORD(x,hx); return x; } #ifdef _DOUBLE_IS_32BITS #ifdef __STDC__ double nextafter(double x, double y) #else double nextafter(x,y) double x,y; #endif { return (double) nextafterf((float) x, (float) x); } #endif /* defined(_DOUBLE_IS_32BITS) */
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