diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c')
-rw-r--r-- | REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c b/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c new file mode 100644 index 0000000000..7c5d1cc112 --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c @@ -0,0 +1,79 @@ +/* s_nexttowardf.c -- float version of s_nextafter.c. + * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com + * and Jakub Jelinek, jj@ultra.linux.cz. + */ + +/* + * ==================================================== + * 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. + * ==================================================== + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: $"; +#endif + +#include <errno.h> +#include <math.h> +#include <math_private.h> +#include <math_ldbl_opt.h> +#include <float.h> + +float __nexttowardf(float x, long double y) +{ + int32_t hx,ix; + int64_t hy,iy; + double yhi; + + GET_FLOAT_WORD(hx,x); + yhi = ldbl_high (y); + EXTRACT_WORDS64 (hy, yhi); + ix = hx&0x7fffffff; /* |x| */ + iy = hy&0x7fffffffffffffffLL; /* |y| */ + + if((ix>0x7f800000) || /* x is nan */ + (iy>0x7ff0000000000000LL)) + /* y is nan */ + return x+y; + if((long double) x==y) return y; /* x=y, return y */ + if(ix==0) { /* x == 0 */ + float u; + SET_FLOAT_WORD(x,(u_int32_t)((hy>>32)&0x80000000)|1);/* return +-minsub*/ + u = math_opt_barrier (x); + u = u * u; + math_force_eval (u); /* raise underflow flag */ + return x; + } + if(hx>=0) { /* x > 0 */ + if(x > y) { /* x -= ulp */ + hx -= 1; + } else { /* x < y, x += ulp */ + hx += 1; + } + } else { /* x < 0 */ + if(x < y) { /* x -= ulp */ + hx -= 1; + } else { /* x > y, x += ulp */ + hx += 1; + } + } + hy = hx&0x7f800000; + if(hy>=0x7f800000) { + float u = x+x; /* overflow */ + math_force_eval (u); + __set_errno (ERANGE); + } + if(hy<0x00800000) { /* underflow */ + float u = x*x; + math_force_eval (u); /* raise underflow flag */ + __set_errno (ERANGE); + } + SET_FLOAT_WORD(x,hx); + return x; +} +long_double_symbol (libm, __nexttowardf, nexttowardf); |