[svn-r10081] Purpose: Some Kind of Verification

Description:  The library didn't handle incorrect hardware conversion for datatype.  It simply did
convert to incorrect data if any hardware didn't handle correctly.

Solution:  During configuration, incorrect hardware conversion is detected and some macros are
defined.  Use these macros to decide whether to register hardware conversion in H5T.c.  If no hardware
conversion function is registered for certain pair of datatypes, software conversion function will
be used as the conversion path.  Although slower than hardware conversion, we're more confident
software conversion is accurate.

So in one sentence to describe library's behavior, if some hardware conversion doesn't work well,
software conversion will be used instead.

Platforms tested:  h5committest and fuss.

Misc. update:  some changes to configure's comments.

2 files changed, 51 insertions, 4 deletions

diff --git a/src/H5T.c b/src/H5T.c
index c848eb0..5913d95 100644
--- a/src/H5T.c
+++ b/src/H5T.c
@@ -993,8 +993,10 @@ H5T_init_interface(void)
      */
 
     /* floating point */
+#if H5_CONVERT_DENORMAL_FLOAT
     status |= H5T_register(H5T_PERS_HARD, "flt_dbl", native_float, native_double, H5T_conv_float_double, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "dbl_flt", native_double, native_float, H5T_conv_double_float, H5AC_dxpl_id);
+#endif /*H5_CONVERT_DENORMAL_FLOAT*/
 
     /* from long_long */
     status |= H5T_register(H5T_PERS_HARD, "llong_ullong", native_llong, native_ullong, H5T_conv_llong_ullong, H5AC_dxpl_id);
@@ -1099,104 +1101,149 @@ H5T_init_interface(void)
     /* From char to floats */
     status |= H5T_register(H5T_PERS_HARD, "schar_flt", native_schar, native_float, H5T_conv_schar_float, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "schar_dbl", native_schar, native_double, H5T_conv_schar_double, H5AC_dxpl_id);
+#if H5_SW_INTEGER_TO_LDOUBLE_WORKS
     status |= H5T_register(H5T_PERS_HARD, "schar_ldbl", native_schar, native_ldouble, H5T_conv_schar_ldouble, H5AC_dxpl_id);
+#endif /*H5_SW_INTEGER_TO_LDOUBLE_WORKS*/
 
     /* From unsigned char to floats */
     status |= H5T_register(H5T_PERS_HARD, "uchar_flt", native_uchar, native_float, H5T_conv_uchar_float, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "uchar_dbl", native_uchar, native_double, H5T_conv_uchar_double, H5AC_dxpl_id);
+#if H5_SW_INTEGER_TO_LDOUBLE_WORKS
     status |= H5T_register(H5T_PERS_HARD, "uchar_ldbl", native_uchar, native_ldouble, H5T_conv_uchar_ldouble, H5AC_dxpl_id);
+#endif /*H5_SW_INTEGER_TO_LDOUBLE_WORKS*/
 
     /* From short to floats */
     status |= H5T_register(H5T_PERS_HARD, "short_flt", native_short, native_float, H5T_conv_short_float, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "short_dbl", native_short, native_double, H5T_conv_short_double, H5AC_dxpl_id);
+#if H5_SW_INTEGER_TO_LDOUBLE_WORKS
     status |= H5T_register(H5T_PERS_HARD, "short_ldbl", native_short, native_ldouble, H5T_conv_short_ldouble, H5AC_dxpl_id);
+#endif /*H5_SW_INTEGER_TO_LDOUBLE_WORKS*/
     
     /* From unsigned short to floats */
     status |= H5T_register(H5T_PERS_HARD, "ushort_flt", native_ushort, native_float, H5T_conv_ushort_float, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "ushort_dbl", native_ushort, native_double, H5T_conv_ushort_double, H5AC_dxpl_id);
+#if H5_SW_INTEGER_TO_LDOUBLE_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ushort_ldbl", native_ushort, native_ldouble, H5T_conv_ushort_ldouble, H5AC_dxpl_id);
+#endif /*H5_SW_INTEGER_TO_LDOUBLE_WORKS*/
 
     /* From int to floats */
     status |= H5T_register(H5T_PERS_HARD, "int_flt", native_int, native_float, H5T_conv_int_float, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "int_dbl", native_int, native_double, H5T_conv_int_double, H5AC_dxpl_id);
+#if H5_SW_INTEGER_TO_LDOUBLE_WORKS
     status |= H5T_register(H5T_PERS_HARD, "int_ldbl", native_int, native_ldouble, H5T_conv_int_ldouble, H5AC_dxpl_id);
+#endif /*H5_SW_INTEGER_TO_LDOUBLE_WORKS*/
     
     /* From unsigned int to floats */
     status |= H5T_register(H5T_PERS_HARD, "uint_flt", native_uint, native_float, H5T_conv_uint_float, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "uint_dbl", native_uint, native_double, H5T_conv_uint_double, H5AC_dxpl_id);
+#if H5_SW_INTEGER_TO_LDOUBLE_WORKS
     status |= H5T_register(H5T_PERS_HARD, "uint_ldbl", native_uint, native_ldouble, H5T_conv_uint_ldouble, H5AC_dxpl_id);
+#endif /*H5_SW_INTEGER_TO_LDOUBLE_WORKS*/
 
     /* From long to floats */
     status |= H5T_register(H5T_PERS_HARD, "long_flt", native_long, native_float, H5T_conv_long_float, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "long_dbl", native_long, native_double, H5T_conv_long_double, H5AC_dxpl_id);
+#if H5_SW_INTEGER_TO_LDOUBLE_WORKS
     status |= H5T_register(H5T_PERS_HARD, "long_ldbl", native_long, native_ldouble, H5T_conv_long_ldouble, H5AC_dxpl_id);
+#endif /*H5_SW_INTEGER_TO_LDOUBLE_WORKS*/
     
     /* From unsigned long to floats */
+#if H5_SW_ULONG_TO_FP_BOTTOM_BIT_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ulong_flt", native_ulong, native_float, H5T_conv_ulong_float, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "ulong_dbl", native_ulong, native_double, H5T_conv_ulong_double, H5AC_dxpl_id);
+#endif /*H5_SW_ULONG_TO_FP_BOTTOM_BIT_WORKS*/
+#if H5_SW_ULONG_TO_FP_BOTTOM_BIT_WORKS && H5_SW_INTEGER_TO_LDOUBLE_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ulong_ldbl", native_ulong, native_ldouble, H5T_conv_ulong_ldouble, H5AC_dxpl_id);
+#endif /* H5_SW_ULONG_TO_FP_BOTTOM_BIT_WORKS && H5_SW_INTEGER_TO_LDOUBLE_WORKS*/
 
     /* From long long to floats */
     status |= H5T_register(H5T_PERS_HARD, "llong_flt", native_llong, native_float, H5T_conv_llong_float, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "llong_dbl", native_llong, native_double, H5T_conv_llong_double, H5AC_dxpl_id);
+#if H5_SW_INTEGER_TO_LDOUBLE_WORKS
     status |= H5T_register(H5T_PERS_HARD, "llong_ldbl", native_llong, native_ldouble, H5T_conv_llong_ldouble, H5AC_dxpl_id);
+#endif /*H5_SW_INTEGER_TO_LDOUBLE_WORKS*/
     
-#ifdef H5_ULLONG_TO_FP_CAST_WORKS
     /* From unsigned long long to floats */
+#if H5_ULLONG_TO_FP_CAST_WORKS && H5_SW_ULONG_TO_FP_BOTTOM_BIT_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ullong_flt", native_ullong, native_float, H5T_conv_ullong_float, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "ullong_dbl", native_ullong, native_double, H5T_conv_ullong_double, H5AC_dxpl_id);
+#endif /*H5_ULLONG_TO_FP_CAST_WORKS && H5_SW_ULONG_TO_FP_BOTTOM_BIT_WORKS*/
+#if H5_ULLONG_TO_FP_CAST_WORKS && H5_SW_ULONG_TO_FP_BOTTOM_BIT_WORKS && H5_SW_INTEGER_TO_LDOUBLE_WORKS && H5_ULLONG_TO_LDOUBLE_PRECISION_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ullong_ldbl", native_ullong, native_ldouble, H5T_conv_ullong_ldouble, H5AC_dxpl_id);
-#endif /* H5_ULLONG_TO_FP_CAST_WORKS */
+#endif /*H5_ULLONG_TO_FP_CAST_WORKS && H5_SW_ULONG_TO_FP_BOTTOM_BIT_WORKS && H5_SW_INTEGER_TO_LDOUBLE_WORKS && H5_ULLONG_TO_LDOUBLE_PRECISION_WORKS*/
 
     /* From floats to char */
     status |= H5T_register(H5T_PERS_HARD, "flt_schar", native_float, native_schar, H5T_conv_float_schar, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "dbl_schar", native_double, native_schar, H5T_conv_double_schar, H5AC_dxpl_id);
+#if H5_SW_LDOUBLE_TO_INTEGER_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ldbl_schar", native_ldouble, native_schar, H5T_conv_ldouble_schar, H5AC_dxpl_id);
+#endif /*H5_SW_LDOUBLE_TO_INTEGER_WORKS*/
 
     /* From floats to unsigned char */
     status |= H5T_register(H5T_PERS_HARD, "flt_uchar", native_float, native_uchar, H5T_conv_float_uchar, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "dbl_uchar", native_double, native_uchar, H5T_conv_double_uchar, H5AC_dxpl_id);
+#if H5_SW_LDOUBLE_TO_INTEGER_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ldbl_uchar", native_ldouble, native_uchar, H5T_conv_ldouble_uchar, H5AC_dxpl_id);
+#endif /*H5_SW_LDOUBLE_TO_INTEGER_WORKS*/
    
     /* From floats to short */
     status |= H5T_register(H5T_PERS_HARD, "flt_short", native_float, native_short, H5T_conv_float_short, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "dbl_short", native_double, native_short, H5T_conv_double_short, H5AC_dxpl_id);
+#if H5_SW_LDOUBLE_TO_INTEGER_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ldbl_short", native_ldouble, native_short, H5T_conv_ldouble_short, H5AC_dxpl_id);
+#endif /*H5_SW_LDOUBLE_TO_INTEGER_WORKS*/
 
     /* From floats to unsigned short */
     status |= H5T_register(H5T_PERS_HARD, "flt_ushort", native_float, native_ushort, H5T_conv_float_ushort, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "dbl_ushort", native_double, native_ushort, H5T_conv_double_ushort, H5AC_dxpl_id);
+#if H5_SW_LDOUBLE_TO_INTEGER_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ldbl_ushort", native_ldouble, native_ushort, H5T_conv_ldouble_ushort, H5AC_dxpl_id);
+#endif /*H5_SW_LDOUBLE_TO_INTEGER_WORKS*/
   
     /* From floats to int */
     status |= H5T_register(H5T_PERS_HARD, "flt_int", native_float, native_int, H5T_conv_float_int, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "dbl_int", native_double, native_int, H5T_conv_double_int, H5AC_dxpl_id);
+#if H5_SW_LDOUBLE_TO_INTEGER_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ldbl_int", native_ldouble, native_int, H5T_conv_ldouble_int, H5AC_dxpl_id);
+#endif /*H5_SW_LDOUBLE_TO_INTEGER_WORKS*/
 
     /* From floats to unsigned int */
     status |= H5T_register(H5T_PERS_HARD, "flt_uint", native_float, native_uint, H5T_conv_float_uint, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "dbl_uint", native_double, native_uint, H5T_conv_double_uint, H5AC_dxpl_id);
+#if H5_SW_LDOUBLE_TO_INTEGER_WORKS && H5_CV_LDOUBLE_TO_UINT_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ldbl_uint", native_ldouble, native_uint, H5T_conv_ldouble_uint, H5AC_dxpl_id);
+#endif /*H5_SW_LDOUBLE_TO_INTEGER_WORKS && H5_CV_LDOUBLE_TO_UINT_WORKS*/
 
-    /* From floats to long */
     status |= H5T_register(H5T_PERS_HARD, "flt_long", native_float, native_long, H5T_conv_float_long, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "dbl_long", native_double, native_long, H5T_conv_double_long, H5AC_dxpl_id);
+#if H5_SW_LDOUBLE_TO_INTEGER_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ldbl_long", native_ldouble, native_long, H5T_conv_ldouble_long, H5AC_dxpl_id);
+#endif /*H5_SW_LDOUBLE_TO_INTEGER_WORKS*/
 
     /* From floats to unsigned long */
     status |= H5T_register(H5T_PERS_HARD, "flt_ulong", native_float, native_ulong, H5T_conv_float_ulong, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "dbl_ulong", native_double, native_ulong, H5T_conv_double_ulong, H5AC_dxpl_id);
+#if H5_SW_LDOUBLE_TO_INTEGER_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ldbl_ulong", native_ldouble, native_ulong, H5T_conv_ldouble_ulong, H5AC_dxpl_id);
+#endif /*H5_SW_LDOUBLE_TO_INTEGER_WORKS*/
 
     /* From floats to long long */
+#ifndef H5_HW_FP_TO_LLONG_NOT_WORKS
     status |= H5T_register(H5T_PERS_HARD, "flt_llong", native_float, native_llong, H5T_conv_float_llong, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "dbl_llong", native_double, native_llong, H5T_conv_double_llong, H5AC_dxpl_id);
+#endif /*H5_HW_FP_TO_LLONG_NOT_WORKS*/
+#if H5_SW_LDOUBLE_TO_INTEGER_WORKS && !H5_HW_FP_TO_LLONG_NOT_WORKS
     status |= H5T_register(H5T_PERS_HARD, "ldbl_llong", native_ldouble, native_llong, H5T_conv_ldouble_llong, H5AC_dxpl_id);
+#endif /*H5_SW_LDOUBLE_TO_INTEGER_WORKS && !H5_HW_FP_TO_LLONG_NOT_WORKS*/
 
     /* From floats to unsigned long long */
+#if H5_FP_TO_ULLONG_BOTTOM_BIT_WORKS && H5_FP_TO_ULLONG_RIGHT_MAXIMUM
     status |= H5T_register(H5T_PERS_HARD, "flt_ullong", native_float, native_ullong, H5T_conv_float_ullong, H5AC_dxpl_id);
     status |= H5T_register(H5T_PERS_HARD, "dbl_ullong", native_double, native_ullong, H5T_conv_double_ullong, H5AC_dxpl_id);
+#endif /*H5_FP_TO_ULLONG_BOTTOM_BIT_WORKS && H5_FP_TO_ULLONG_RIGHT_MAXIMUM*/
+#if H5_FP_TO_ULLONG_BOTTOM_BIT_WORKS && H5_SW_LDOUBLE_TO_INTEGER_WORKS && H5_FP_TO_ULLONG_RIGHT_MAXIMUM
     status |= H5T_register(H5T_PERS_HARD, "ldbl_ullong", native_ldouble, native_ullong, H5T_conv_ldouble_ullong, H5AC_dxpl_id);
+#endif /*H5_FP_TO_ULLONG_BOTTOM_BIT_WORKS && H5_SW_LDOUBLE_TO_INTEGER_WORKS && H5_FP_TO_ULLONG_RIGHT_MAXIMUM*/
 
     /*
      * The special no-op conversion is the fastest, so we list it last. The
diff --git a/src/H5config.h.in b/src/H5config.h.in
index fb928eb..5bc0a04 100644
--- a/src/H5config.h.in
+++ b/src/H5config.h.in
@@ -540,7 +540,7 @@
    values. */
 #undef SW_LDOUBLE_TO_INTEGER_WORKS
 
-/* Define if your system can accurately convert unsigned long long values to
+/* Define if your system can accurately convert unsigned (long) long values to
    floating-point values. */
 #undef SW_ULONG_TO_FP_BOTTOM_BIT_WORKS