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[svn-r9819] Purpose: Bug fix

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Description:  The fix of the loss problem of the last 2 bytes of mantissa on sleipnir has
not been successful.  It happens when converting from unsigned long long to long double.
 The failure has been on and off.

Solution:  Hard set a macro to disable unsigned long long->long double for FreeBSD until
a good solution is found to solve this elusive problem.

Platforms tested: sleipnir and fuss.  Only sleipnir is concerned.

Misc. update:
This commit is contained in:
Raymond Lu 2005-01-13 17:01:52 -05:00
parent 4cd492dbb4
commit 96cc43235e
4 changed files with 30 additions and 24 deletions
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4
config/freebsd
View File

@ -43,3 +43,7 @@ if test "X-" != "X-$enable_threadsafe"; then
CXXFLAGS="$CXXFLAGS -D_THREAD_SAFE"
LDFLAGS="$LDFLAGS -pthread"
fi
# Temporarily hard set this variable. The problem of loss of the last 2 bytes of mantissa
# turns out to be elusive. Hard set it until a better solution is found.
hdf5_cv_ullong_to_ldouble_precision_works=${hdf5_cv_ullong_to_ldouble_precision_works='no'}

19
configure vendored
View File

@ -33956,29 +33956,30 @@ else
unsigned long long l = 0xa601e80bda85fcefULL;
long double ld;
unsigned char *c1, *c2;
int endian, size;
size_t size;
int endian;
int tst_value = 1;
int i;
int ret = 0;
int ret = 0;
/* Determine this system's endianess */
c1 = (unsigned char*)calloc(1, sizeof(int));
memcpy(c1, &tst_value, sizeof(int));
memcpy((void*)c1, &tst_value, sizeof(int));
if(c1[0]==1)
endian = 0; /* little endian */
else
endian = 1; /* big endian */
memset(&ld, 0, 12);
size = sizeof(long double);
memset(&ld, 0, size);
ld = (long double)l;
size = sizeof(long double);
c2 = (unsigned char*)malloc(size);
memcpy(c2, &ld, size);
c2 = (unsigned char*)calloc(1, size);
memcpy((void*)c2, &ld, size);
/* Test if the last 2 bytes of mantissa are lost. Mainly for FreeBSD on Intel
* architecture(sleipnir) where it happens. */
if(endian==0 && c2[0]==0 && c2[1]==0) /*little endian*/
/*if(endian==0 && c2[0]==0 && c2[1]==0)*/ /*little endian*/
if(endian==0 && c2[0]==0) /*little endian*/
ret = 1;
free(c1);

19
configure.in
View File

@ -2768,29 +2768,30 @@ AC_CACHE_VAL([hdf5_cv_ullong_to_ldouble_precision_works],
unsigned long long l = 0xa601e80bda85fcefULL;
long double ld;
unsigned char *c1, *c2;
int endian, size;
size_t size;
int endian;
int tst_value = 1;
int i;
int ret = 0;
int ret = 0;
/* Determine this system's endianess */
c1 = (unsigned char*)calloc(1, sizeof(int));
memcpy(c1, &tst_value, sizeof(int));
memcpy((void*)c1, &tst_value, sizeof(int));
if(c1[0]==1)
endian = 0; /* little endian */
else
endian = 1; /* big endian */
memset(&ld, 0, 12);
size = sizeof(long double);
memset(&ld, 0, size);
ld = (long double)l;
size = sizeof(long double);
c2 = (unsigned char*)malloc(size);
memcpy(c2, &ld, size);
c2 = (unsigned char*)calloc(1, size);
memcpy((void*)c2, &ld, size);
/* Test if the last 2 bytes of mantissa are lost. Mainly for FreeBSD on Intel
* architecture(sleipnir) where it happens. */
if(endian==0 && c2[0]==0 && c2[1]==0) /*little endian*/
/*if(endian==0 && c2[0]==0 && c2[1]==0)*/ /*little endian*/
if(endian==0 && c2[0]==0) /*little endian*/
ret = 1;
free(c1);

12
test/dtypes.c
View File

@ -5859,8 +5859,8 @@ test_conv_int_float(const char *name, hid_t src, hid_t dst)
long double tmp_s, tmp_h;
HDmemcpy(&tmp_s,&buf[j*dst_size],sizeof(long double));
HDmemcpy(&tmp_h,&hw[0],sizeof(long double));
/*Don't compare the last 2 bytes of mantissa*/
if(!HDmemcmp(&tmp_s+3, &tmp_h+3, sizeof(long double)-3))
/*Don't compare the last 3 bytes of mantissa*/
if(!HDmemcmp(&tmp_s+4, &tmp_h+4, sizeof(long double)-4))
continue; /*no error*/
}
#endif /*end H5_ULLONG_TO_LDOUBLE_PRECISION_WORKS*/
@ -6397,7 +6397,9 @@ run_int_float_conv(const char *name)
#if H5_SIZEOF_LONG_LONG!=H5_SIZEOF_LONG
nerrors += test_conv_int_float(name, H5T_NATIVE_LLONG, H5T_NATIVE_LDOUBLE);
#ifdef H5_ULLONG_TO_FP_CAST_WORKS
#ifdef H5_ULLONG_TO_LDOUBLE_PRECISION_WORKS
nerrors += test_conv_int_float(name, H5T_NATIVE_ULLONG, H5T_NATIVE_LDOUBLE);
#endif /*H5_ULLONG_TO_LDOUBLE_PRECISION_WORKS*/
#else /* H5_ULLONG_TO_FP_CAST_WORKS */
{
char str[256]; /*hello string */
@ -6446,7 +6448,7 @@ static int
run_float_int_conv(const char *name)
{
int nerrors = 0;
#ifndef TMP
nerrors += test_conv_int_float(name, H5T_NATIVE_FLOAT, H5T_NATIVE_SCHAR);
nerrors += test_conv_int_float(name, H5T_NATIVE_DOUBLE, H5T_NATIVE_SCHAR);
@ -6507,7 +6509,6 @@ run_float_int_conv(const char *name)
#endif /*H5_FP_TO_ULLONG_RIGHT_MAXIMUM*/
#endif
#endif /*TMP*/
if(!strcmp(name, "sw")) {
#if H5_SW_LDOUBLE_TO_INTEGER_WORKS
#if H5_SIZEOF_LONG_DOUBLE!=H5_SIZEOF_DOUBLE
@ -6984,7 +6985,7 @@ main(void)
if (ALIGNMENT)
printf("Testing non-aligned conversions (ALIGNMENT=%d)....\n", ALIGNMENT);
#ifndef TMP
/* Do the tests */
nerrors += test_classes();
nerrors += test_copy();
@ -7060,7 +7061,6 @@ main(void)
/* Test software float-integer conversion functions */
nerrors += run_float_int_conv("sw");
#endif /*TMP*/
/* Test software integer-float conversion functions */
nerrors += run_int_float_conv("sw");