usr/src/lib/libc/sparc/fp/_Q_cmpe.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_cmpe _Qp_cmpe
  33 #endif
  34
  35 /*
  36  * _Q_cmpe(x, y) returns the condition code that would result from
  37  * fcmpeq *x, *y (and raises the same exceptions).
  38  */
  39 enum fcc_type
  40 _Q_cmpe(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                 /* nan, signal invalid */
  46                 __quad_getfsrp(&fsr);
  47                 if (fsr & FSR_NVM) {
  48                         __quad_fcmpeq(x, y, &fsr);
  49                         return ((fsr >> 10) & 3);
  50                 } else {
  51                         fsr = (fsr & ~FSR_CEXC) | FSR_NVA | FSR_NVC;
  52                         __quad_setfsrp(&fsr);
  53                 }
  54                 return (fcc_unordered);
  55         }
  56
  57         /* ignore sign of zero */
  58         xm = x->l.msw;
  59         if (QUAD_ISZERO(*x))
  60                 xm &= 0x7fffffff;
  61         ym = y->l.msw;
  62         if (QUAD_ISZERO(*y))
  63                 ym &= 0x7fffffff;
  64
  65         if ((xm ^ ym) & 0x80000000)     /* x and y have opposite signs */
  66                 return ((ym & 0x80000000)? fcc_greater : fcc_less);
  67
  68         if (xm & 0x80000000) {
  69                 if (xm > ym)
  70                         return (fcc_less);
  71                 if (xm < ym)
  72                         return (fcc_greater);
  73                 if (x->l.frac2 > y->l.frac2)
  74                         return (fcc_less);
  75                 if (x->l.frac2 < y->l.frac2)
  76                         return (fcc_greater);
  77                 if (x->l.frac3 > y->l.frac3)
  78                         return (fcc_less);
  79                 if (x->l.frac3 < y->l.frac3)
  80                         return (fcc_greater);
  81                 if (x->l.frac4 > y->l.frac4)
  82                         return (fcc_less);
  83                 if (x->l.frac4 < y->l.frac4)
  84                         return (fcc_greater);
  85                 return (fcc_equal);
  86         }
  87         if (xm < ym)
  88                 return (fcc_less);
  89         if (xm > ym)
  90                 return (fcc_greater);
  91         if (x->l.frac2 < y->l.frac2)
  92                 return (fcc_less);
  93         if (x->l.frac2 > y->l.frac2)
  94                 return (fcc_greater);
  95         if (x->l.frac3 < y->l.frac3)
  96                 return (fcc_less);
  97         if (x->l.frac3 > y->l.frac3)
  98                 return (fcc_greater);
  99         if (x->l.frac4 < y->l.frac4)
 100                 return (fcc_less);
 101         if (x->l.frac4 > y->l.frac4)
 102                 return (fcc_greater);
 103         return (fcc_equal);
 104 }