1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  23  */
  24 /*
  25  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28 
  29 #pragma weak aintl = __aintl
  30 #pragma weak anintl = __anintl
  31 #pragma weak irintl = __irintl
  32 #pragma weak nintl = __nintl
  33 
  34 /*
  35  * aintl(x)     return x chopped to integral value
  36  * anintl(x)    return sign(x)*(|x|+0.5) chopped to integral value
  37  * irintl(x)    return rint(x) in integer format
  38  * nintl(x)     return anint(x) in integer format
  39  *
  40  * NOTE: aintl(x), anintl(x), ceill(x), floorl(x), and rintl(x) return result
  41  * with the same sign as x's,  including 0.0.
  42  */
  43 
  44 #include "libm.h"
  45 #include "longdouble.h"
  46 
  47 extern enum fp_direction_type __swapRD(enum fp_direction_type);
  48 
  49 static const long double qone = 1.0L, qhalf = 0.5L, qmhalf = -0.5L;
  50 
  51 long double
  52 aintl(long double x) {
  53         long double t, w;
  54 
  55         if (!finitel(x))
  56                 return (x + x);
  57         w = fabsl(x);
  58         t = rintl(w);
  59         if (t <= w)
  60                 return (copysignl(t, x));       /* NaN or already aint(|x|) */
  61         else    /* |t|>|x| case */
  62                 return (copysignl(t - qone, x));        /* |t-1|*sign(x) */
  63 }
  64 
  65 long double
  66 anintl(long double x) {
  67         long double t, w, z;
  68 
  69         if (!finitel(x))
  70                 return (x + x);
  71         w = fabsl(x);
  72         t = rintl(w);
  73         if (t == w)
  74                 return (copysignl(t, x));
  75         z = t - w;
  76         if (z > qhalf)
  77                 t = t - qone;
  78         else if (z <= qmhalf)
  79                 t = t + qone;
  80         return (copysignl(t, x));
  81 }
  82 
  83 int
  84 irintl(long double x) {
  85         enum fp_direction_type rd;
  86 
  87         rd = __swapRD(fp_nearest);
  88         (void) __swapRD(rd);    /* restore Rounding Direction */
  89         switch (rd) {
  90         case fp_nearest:
  91                 if (x < 2147483647.5L && x >= -2147483648.5L)
  92                         return ((int)rintl(x));
  93                 break;
  94         case fp_tozero:
  95                 if (x < 2147483648.0L && x > -2147483649.0L)
  96                         return ((int)rintl(x));
  97                 break;
  98         case fp_positive:
  99                 if (x <= 2147483647.0L && x > -2147483649.0L)
 100                         return ((int)rintl(x));
 101                 break;
 102         case fp_negative:
 103                 if (x < 2147483648.0L && x >= -2147483648.0L)
 104                         return ((int)rintl(x));
 105                 break;
 106         }
 107         return ((int)copysignl(1.0e100L, x));
 108 }
 109 
 110 int
 111 nintl(long double x) {
 112         if ((x < 2147483647.5L) && (x > -2147483648.5L))
 113                 return ((int)anintl(x));
 114         else
 115                 return ((int)copysignl(1.0e100L, x));
 116 }