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c.lib 1.169 (8.8.2004)

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- Since the 'long double' data type is not really supported by the GCC
  versions we use (and not supported by SAS/C either) building the
  library with support code for it is now a configurable option. Unless
  enabled, 'long double' is now treated like 'double'.

- Reworked the HUGE_VAL definition which previously would default to
  Infinity. The new code properly defines this to the largest
  representable floating point number. The 'great' thing about the
  HUGE_VAL definition in this library is that it's a reference to
  a binary constant initialized by the library startup code. So any
  application checking for HUGE_VAL merely needs to be relinked
  rather than recompiled.


git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14703 87f5fb63-7c3d-0410-a384-fd976d0f7a62
This commit is contained in:
Olaf Barthel
2004-08-08 10:55:57 +00:00
parent 0a3962a105
commit 3f284b7fb8
24 changed files with 145 additions and 141 deletions
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42
library/math_fp_support.h
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@ -1,5 +1,5 @@
/*
* $Id: math_fp_support.h,v 1.1.1.1 2004-07-26 16:30:44 obarthel Exp $
* $Id: math_fp_support.h,v 1.2 2004-08-08 10:55:57 obarthel Exp $
*
* :ts=4
*
@ -36,9 +36,47 @@
/****************************************************************************/
/* If any of the three supported floating point support flavours is
enabled, make sure that the generic 'FLOATING_POINT_SUPPORT' symbol
is defined, too.*/
#if (defined(IEEE_FLOATING_POINT_SUPPORT) || defined(M68881_FLOATING_POINT_SUPPORT) || defined(PPC_FLOATING_POINT_SUPPORT))
#define FLOATING_POINT_SUPPORT
#endif
#endif /* IEEE_FLOATING_POINT_SUPPORT || M68881_FLOATING_POINT_SUPPORT || PPC_FLOATING_POINT_SUPPORT */
/****************************************************************************/
/* This selects whether or not the 'long double' type should be used. So far,
only 'double' can be supported, and 'long double' defaults to 'double'. */
/*#define USE_LONG_DOUBLE*/
/****************************************************************************/
#if defined(USE_LONG_DOUBLE)
typedef long double __long_double_t;
#else
typedef double __long_double_t;
#endif /* USE_LONG_DOUBLE */
/****************************************************************************/
/* 'Portable' raw representations of three IEEE floating point formats. */
union ieee_long_double
{
long double value;
unsigned long raw[3];
};
union ieee_double
{
double value;
unsigned long raw[2];
};
union ieee_single
{
float value;
unsigned long raw[1];
};
/****************************************************************************/