usr/src/lib/libm/common/C/libm_macros.h

   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 #ifndef _LIBM_MACROS_H
  30 #define _LIBM_MACROS_H
  31
  32 #include <sys/isa_defs.h>
  33
  34 #if defined(__sparc)
  35
  36 #define HIWORD          0
  37 #define LOWORD          1
  38 #define HIXWORD         0               /* index of int containing exponent */
  39 #define XSGNMSK         0x80000000      /* exponent bit mask within the int */
  40 #define XBIASED_EXP(x)  ((((int *)&x)[HIXWORD] & ~0x80000000) >> 16)
  41 #define ISZEROL(x)      (((((int *)&x)[0] & ~XSGNMSK) | ((int *)&x)[1] | \
  42                                 ((int *)&x)[2] | ((int *)&x)[3]) == 0)
  43
  44 #elif defined(__x86)
  45
  46 #define HIWORD          1
  47 #define LOWORD          0
  48 #define HIXWORD         2
  49 #define XSGNMSK         0x8000
  50 #define XBIASED_EXP(x)  (((int *)&x)[HIXWORD] & 0x7fff)
  51 #define ISZEROL(x)      (x == 0.0L)
  52
  53 #define HANDLE_UNSUPPORTED
  54
  55 /*
  56  * "convert" the high-order 32 bits of a SPARC quad precision
  57  * value ("I") to the sign, exponent, and high-order bits of an
  58  * x86 extended double precision value ("E"); the low-order bits
  59  * in the 12-byte quantity are left intact
  60  */
  61 #define ITOX(I, E)       \
  62                 E[2] = 0xffff & ((I) >> 16); \
  63                 E[1] = (((I) & 0x7fff0000) == 0)? \
  64                     (E[1] & 0x7fff) | (0x7fff8000 & ((I) << 15)) :\
  65                     0x80000000 | (E[1] & 0x7fff) | (0x7fff8000 & ((I) << 15))
  66
  67 /*
  68  * "convert" the sign, exponent, and high-order bits of an x86
  69  * extended double precision value ("E") to the high-order 32 bits
  70  * of a SPARC quad precision value ("I")
  71  */
  72 #define XTOI(E, I)      \
  73                 I = ((E[2]<<16) | (0xffff & (E[1]>>15)))
  74
  75 #else
  76 #error Unknown architecture
  77 #endif
  78
  79 #endif  /* _LIBM_MACROS_H */