| 1 | /* s_rintl.c -- long double version of s_rint.c. |
|---|
| 2 | */ |
|---|
| 3 | |
|---|
| 4 | /* |
|---|
| 5 | * ==================================================== |
|---|
| 6 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
|---|
| 7 | * |
|---|
| 8 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
|---|
| 9 | * Permission to use, copy, modify, and distribute this |
|---|
| 10 | * software is freely granted, provided that this notice |
|---|
| 11 | * is preserved. |
|---|
| 12 | * ==================================================== |
|---|
| 13 | */ |
|---|
| 14 | |
|---|
| 15 | #if defined (LIBM_SCCS) && ! defined (lint) |
|---|
| 16 | static char rcsid[] = "$NetBSD: $" ; |
|---|
| 17 | #endif |
|---|
| 18 | |
|---|
| 19 | /* |
|---|
| 20 | * rintl(x) |
|---|
| 21 | * Return x rounded to integral value according to the prevailing |
|---|
| 22 | * rounding mode. |
|---|
| 23 | * Method: |
|---|
| 24 | * Using floating addition. |
|---|
| 25 | * Exception: |
|---|
| 26 | * Inexact flag raised if x not equal to rintl(x). |
|---|
| 27 | */ |
|---|
| 28 | |
|---|
| 29 | #define NO_MATH_REDIRECT |
|---|
| 30 | #include <math.h> |
|---|
| 31 | #include <math_private.h> |
|---|
| 32 | #include <libm-alias-ldouble.h> |
|---|
| 33 | #include <math-use-builtins.h> |
|---|
| 34 | |
|---|
| 35 | _Float128 |
|---|
| 36 | __rintl (_Float128 x) |
|---|
| 37 | { |
|---|
| 38 | #if USE_RINTL_BUILTIN |
|---|
| 39 | return __builtin_rintl (x); |
|---|
| 40 | #else |
|---|
| 41 | /* Use generic implementation. */ |
|---|
| 42 | static const _Float128 |
|---|
| 43 | TWO112[2] = { |
|---|
| 44 | 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */ |
|---|
| 45 | -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */ |
|---|
| 46 | }; |
|---|
| 47 | int64_t i0, j0, sx; |
|---|
| 48 | uint64_t i1 __attribute__ ((unused)); |
|---|
| 49 | _Float128 w, t; |
|---|
| 50 | GET_LDOUBLE_WORDS64 (i0, i1, x); |
|---|
| 51 | sx = (((uint64_t) i0) >> 63); |
|---|
| 52 | j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; |
|---|
| 53 | if (j0 < 112) |
|---|
| 54 | { |
|---|
| 55 | if (j0 < 0) |
|---|
| 56 | { |
|---|
| 57 | w = TWO112[sx] + x; |
|---|
| 58 | t = w - TWO112[sx]; |
|---|
| 59 | GET_LDOUBLE_MSW64 (i0, t); |
|---|
| 60 | SET_LDOUBLE_MSW64 (t, (i0 & 0x7fffffffffffffffLL) | (sx << 63)); |
|---|
| 61 | return t; |
|---|
| 62 | } |
|---|
| 63 | } |
|---|
| 64 | else |
|---|
| 65 | { |
|---|
| 66 | if (j0 == 0x4000) |
|---|
| 67 | return x + x; /* inf or NaN */ |
|---|
| 68 | else |
|---|
| 69 | return x; /* x is integral */ |
|---|
| 70 | } |
|---|
| 71 | w = TWO112[sx] + x; |
|---|
| 72 | return w - TWO112[sx]; |
|---|
| 73 | #endif /* ! USE_RINTL_BUILTIN */ |
|---|
| 74 | } |
|---|
| 75 | libm_alias_ldouble (__rint, rint) |
|---|
| 76 | |
|---|
