diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/ldbl-128/s_rintl.c')
| -rw-r--r-- | REORG.TODO/sysdeps/ieee754/ldbl-128/s_rintl.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/ldbl-128/s_rintl.c b/REORG.TODO/sysdeps/ieee754/ldbl-128/s_rintl.c new file mode 100644 index 0000000000..410951626b --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/ldbl-128/s_rintl.c @@ -0,0 +1,62 @@ +/* s_rintl.c -- long double version of s_rint.c. + * Conversion to IEEE quad long double by 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 + +/* + * rintl(x) + * Return x rounded to integral value according to the prevailing + * rounding mode. + * Method: + * Using floating addition. + * Exception: + * Inexact flag raised if x not equal to rintl(x). + */ + +#include <math.h> +#include <math_private.h> + +static const _Float128 +TWO112[2]={ + 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */ + -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */ +}; + +_Float128 __rintl(_Float128 x) +{ + int64_t i0,j0,sx; + u_int64_t i1 __attribute__ ((unused)); + _Float128 w,t; + GET_LDOUBLE_WORDS64(i0,i1,x); + sx = (((u_int64_t)i0)>>63); + j0 = ((i0>>48)&0x7fff)-0x3fff; + if(j0<112) { + if(j0<0) { + w = TWO112[sx]+x; + t = w-TWO112[sx]; + GET_LDOUBLE_MSW64(i0,t); + SET_LDOUBLE_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63)); + return t; + } + } else { + if(j0==0x4000) return x+x; /* inf or NaN */ + else return x; /* x is integral */ + } + w = TWO112[sx]+x; + return w-TWO112[sx]; +} +weak_alias (__rintl, rintl) |