usr/src/lib/libc/sparc/fp/_Q_cmp.c

   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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1994-1997, by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include "quad.h"
  30
  31 #ifdef __sparcv9
  32 #define _Q_cmp  _Qp_cmp
  33 #endif
  34
  35 /*
  36  * _Q_cmp(x, y) returns the condition code that would result from
  37  * fcmpq *x, *y (and raises the same exceptions).
  38  */
  39 enum fcc_type
  40 _Q_cmp(const union longdouble *x, const union longdouble *y)
  41 {
  42         unsigned int    xm, ym, fsr;
  43
  44         if (QUAD_ISNAN(*x) || QUAD_ISNAN(*y)) {
  45                 if ((QUAD_ISNAN(*x) && !(x->l.msw & 0x8000)) ||
  46                     (QUAD_ISNAN(*y) && !(y->l.msw & 0x8000))) {
  47                         /* snan, signal invalid */
  48                         __quad_getfsrp(&fsr);
  49                         if (fsr & FSR_NVM) {
  50                                 __quad_fcmpq(x, y, &fsr);
  51                                 return ((fsr >> 10) & 3);
  52                         } else {
  53                                 fsr = (fsr & ~FSR_CEXC) | FSR_NVA | FSR_NVC;
  54                                 __quad_setfsrp(&fsr);
  55                         }
  56                 }
  57                 return (fcc_unordered);
  58         }
  59
  60         /* ignore sign of zero */
  61         xm = x->l.msw;
  62         if (QUAD_ISZERO(*x))
  63                 xm &= 0x7fffffff;
  64         ym = y->l.msw;
  65         if (QUAD_ISZERO(*y))
  66                 ym &= 0x7fffffff;
  67
  68         if ((xm ^ ym) & 0x80000000)     /* x and y have opposite signs */
  69                 return ((ym & 0x80000000)? fcc_greater : fcc_less);
  70
  71         if (xm & 0x80000000) {
  72                 if (xm > ym)
  73                         return (fcc_less);
  74                 if (xm < ym)
  75                         return (fcc_greater);
  76                 if (x->l.frac2 > y->l.frac2)
  77                         return (fcc_less);
  78                 if (x->l.frac2 < y->l.frac2)
  79                         return (fcc_greater);
  80                 if (x->l.frac3 > y->l.frac3)
  81                         return (fcc_less);
  82                 if (x->l.frac3 < y->l.frac3)
  83                         return (fcc_greater);
  84                 if (x->l.frac4 > y->l.frac4)
  85                         return (fcc_less);
  86                 if (x->l.frac4 < y->l.frac4)
  87                         return (fcc_greater);
  88                 return (fcc_equal);
  89         }
  90         if (xm < ym)
  91                 return (fcc_less);
  92         if (xm > ym)
  93                 return (fcc_greater);
  94         if (x->l.frac2 < y->l.frac2)
  95                 return (fcc_less);
  96         if (x->l.frac2 > y->l.frac2)
  97                 return (fcc_greater);
  98         if (x->l.frac3 < y->l.frac3)
  99                 return (fcc_less);
 100         if (x->l.frac3 > y->l.frac3)
 101                 return (fcc_greater);
 102         if (x->l.frac4 < y->l.frac4)
 103                 return (fcc_less);
 104         if (x->l.frac4 > y->l.frac4)
 105                 return (fcc_greater);
 106         return (fcc_equal);
 107 }