[svn-r7875] Purpose:

    Omnibus floating-point bug fix changes

Description:
    There are a number of problems in the floating-point conversion code that
were exposed by Ray's recent int<->float checkin:
    - The 'my_isnan' code in test/dtypes.c was broken and would always return
        true.  The meant that the actual values in the float<->float conversion
        tests were _never_ checked, hiding the other bugs included in this
        checkin.
    - A recent change I made to the type conversion code used "FLT_MIN" instead
        of "-FLT_MAX" for the most negative 'float' value for the double->float
        conversion, which meant that any the negative number that was converted
        from a double to a float would have been mapped to zero, essentially.
    - A change that Robb appeared to have made ~2.5 years ago to the "generic"
        float->float conversion routine appears to be incorrect and I've backed
        it out.
    - Floating-point conversions on SGI's which converted denormalized values
        would be mapped to zero instead of being propertly preserved in the new
        type.  This was addressed by an SGI-specific system call to prevent the
        behavior.

Solution:
    Described above, generally.

Platforms tested:
    FreeBSD 4.9 (sleipnir)
    h5committest

Misc. update:
    release_docs/RELEASE update forthcoming...

1 files changed, 7 insertions, 0 deletions

diff --git a/src/H5Tpkg.h b/src/H5Tpkg.h
index 9058d90..d87cc2f 100644
--- a/src/H5Tpkg.h
+++ b/src/H5Tpkg.h
@@ -305,6 +305,13 @@ H5_DLLVAR size_t	H5T_NATIVE_UINT_LEAST64_ALIGN_g;
 H5_DLLVAR size_t	H5T_NATIVE_INT_FAST64_ALIGN_g;
 H5_DLLVAR size_t	H5T_NATIVE_UINT_FAST64_ALIGN_g;
 
+/* Useful floating-point values for conversion routines */
+/* (+/- Inf for all floating-point types) */
+H5_DLLVAR float H5T_NATIVE_FLOAT_POS_INF_g;
+H5_DLLVAR float H5T_NATIVE_FLOAT_NEG_INF_g;
+H5_DLLVAR double H5T_NATIVE_DOUBLE_POS_INF_g;
+H5_DLLVAR double H5T_NATIVE_DOUBLE_NEG_INF_g;
+
 /* Common functions */
 H5_DLL herr_t H5T_init_interface(void);
 H5_DLL H5T_t *H5T_create(H5T_class_t type, size_t size);