diff options
Diffstat (limited to 'config/cmake')
-rw-r--r-- | config/cmake/ConfigureChecks.cmake | 30 | ||||
-rw-r--r-- | config/cmake/ConversionTests.c | 82 | ||||
-rw-r--r-- | config/cmake/H5pubconf.h.in | 11 |
3 files changed, 123 insertions, 0 deletions
diff --git a/config/cmake/ConfigureChecks.cmake b/config/cmake/ConfigureChecks.cmake index e223553..09f1caf 100644 --- a/config/cmake/ConfigureChecks.cmake +++ b/config/cmake/ConfigureChecks.cmake @@ -33,6 +33,18 @@ endif (HDF5_METADATA_TRACE_FILE) MARK_AS_ADVANCED (HDF5_METADATA_TRACE_FILE) # ---------------------------------------------------------------------- +# Decide whether the data accuracy has higher priority during data +# conversions. If not, some hard conversions will still be prefered even +# though the data may be wrong (for example, some compilers don't +# support denormalized floating values) to maximize speed. +# +option (HDF5_WANT_DATA_ACCURACY "IF data accuracy is guaranteed during data conversions" ON) +if (HDF5_WANT_DATA_ACCURACY) + set (H5_WANT_DATA_ACCURACY 1) +endif (HDF5_WANT_DATA_ACCURACY) +MARK_AS_ADVANCED (HDF5_WANT_DATA_ACCURACY) + +# ---------------------------------------------------------------------- # Decide whether the presence of user's exception handling functions is # checked and data conversion exceptions are returned. This is mainly # for the speed optimization of hard conversions. Soft conversions can @@ -220,6 +232,24 @@ H5ConversionTests (H5_LDOUBLE_TO_LONG_SPECIAL "Checking IF your system converts # H5ConversionTests (H5_LONG_TO_LDOUBLE_SPECIAL "Checking IF your system can convert (unsigned) long to long double values with special algorithm") # ---------------------------------------------------------------------- +# Set the flag to indicate that the machine can accurately convert +# 'long double' to '(unsigned) long long' values. (This flag should be set for +# all machines, except for Mac OS 10.4 and SGI IRIX64 6.5. When the bit sequence +# of long double is 0x4351ccf385ebc8a0bfcc2a3c..., the values of (unsigned)long long +# start to go wrong on these two machines. Adjusting it higher to +# 0x4351ccf385ebc8a0dfcc... or 0x4351ccf385ebc8a0ffcc... will make the converted +# values wildly wrong. This test detects this wrong behavior and disable the test. +# +H5ConversionTests (H5_LDOUBLE_TO_LLONG_ACCURATE "Checking IF correctly converting long double to (unsigned) long long values") +# ---------------------------------------------------------------------- +# Set the flag to indicate that the machine can accurately convert +# '(unsigned) long long' to 'long double' values. (This flag should be set for +# all machines, except for Mac OS 10.4, when the bit sequences are 003fff..., +# 007fff..., 00ffff..., 01ffff..., ..., 7fffff..., the converted values are twice +# as big as they should be. +# +H5ConversionTests (H5_LLONG_TO_LDOUBLE_CORRECT "Checking IF correctly converting (unsigned) long long to long double values") +# ---------------------------------------------------------------------- # Check if pointer alignments are enforced # H5ConversionTests (H5_NO_ALIGNMENT_RESTRICTIONS "Checking IF alignment restrictions are strictly enforced") diff --git a/config/cmake/ConversionTests.c b/config/cmake/ConversionTests.c index cd2e8bb..d964bf8 100644 --- a/config/cmake/ConversionTests.c +++ b/config/cmake/ConversionTests.c @@ -116,6 +116,88 @@ done: #endif +#ifdef H5_LDOUBLE_TO_LLONG_ACCURATE_TEST +int main(void) +{ + long double ld = 20041683600089727.779961L; + long long ll; + unsigned long long ull; + unsigned char s[16]; + int ret = 0; + + if(sizeof(long double) == 16) { + /*make sure the long double type is the same as the failing type + *which has 16 bytes in size and 11 bits of exponent. If it is, + *the bit sequence should be like below. It's not + *a decent way to check but this info isn't available. */ + memcpy(s, &ld, 16); + if(s[0]==0x43 && s[1]==0x51 && s[2]==0xcc && s[3]==0xf3 && + s[4]==0x85 && s[5]==0xeb && s[6]==0xc8 && s[7]==0xa0 && + s[8]==0xbf && s[9]==0xcc && s[10]==0x2a && s[11]==0x3c) { + + /*slightly adjust the bit sequence (s[8]=0xdf). The converted + *values will go wild on Mac OS 10.4 and IRIX64 6.5.*/ + s[0]=0x43; s[1]=0x51; s[2]=0xcc; s[3]=0xf3; + s[4]=0x85; s[5]=0xeb; s[6]=0xc8; s[7]=0xa0; + s[8]=0xdf; s[9]=0xcc; s[10]=0x2a; s[11]=0x3c; + s[12]=0x3d; s[13]=0x85; s[14]=0x56; s[15]=0x20; + + memcpy(&ld, s, 16); + ll = (long long)ld; + ull = (unsigned long long)ld; + + if(ll != 20041683600089728 || ull != 20041683600089728) + ret = 1; + } + } +done: + exit(ret); +} +#endif + +#ifdef H5_LLONG_TO_LDOUBLE_CORRECT_TEST +int main(void) +{ + long double ld; + long long ll; + unsigned long long ull; + unsigned char s[16]; + int flag=0, ret=0; + + /*Determine if long double has 16 byte in size, 11 bit exponent, and + *the bias is 0x3ff */ + if(sizeof(long double) == 16) { + ld = 1.0L; + memcpy(s, &ld, 16); + if(s[0]==0x3f && s[1]==0xf0 && s[2]==0x00 && s[3]==0x00 && + s[4]==0x00 && s[5]==0x00 && s[6]==0x00 && s[7]==0x00) + flag = 1; + } + + if(flag==1 && sizeof(long long)==8) { + ll = 0x01ffffffffffffffLL; + ld = (long double)ll; + memcpy(s, &ld, 16); + /*Check if the bit sequence is as supposed to be*/ + if(s[0]!=0x43 || s[1]!=0x7f || s[2]!=0xff || s[3]!=0xff || + s[4]!=0xff || s[5]!=0xff || s[6]!=0xff || s[7]!=0xff || + s[8]!=0xf0 || s[9]!=0x00 || s[10]!=0x00 || s[11]!=0x00) + ret = 1; + } + if(flag==1 && sizeof(unsigned long long)==8) { + ull = 0x01ffffffffffffffULL; + ld = (long double)ull; + memcpy(s, &ld, 16); + if(s[0]!=0x43 || s[1]!=0x7f || s[2]!=0xff || s[3]!=0xff || + s[4]!=0xff || s[5]!=0xff || s[6]!=0xff || s[7]!=0xff || + s[8]!=0xf0 || s[9]!=0x00 || s[10]!=0x00 || s[11]!=0x00) + ret = 1; + } +done: + exit(ret); +} +#endif + #ifdef H5_NO_ALIGNMENT_RESTRICTIONS_TEST #include <stdlib.h> diff --git a/config/cmake/H5pubconf.h.in b/config/cmake/H5pubconf.h.in index fcbdbd5..31bcc08 100644 --- a/config/cmake/H5pubconf.h.in +++ b/config/cmake/H5pubconf.h.in @@ -398,10 +398,18 @@ /* Define if HDF5's high-level library headers should be included in hdf5.h */ #cmakedefine H5_INCLUDE_HL @H5_INCLUDE_HL@ +/* Define if your system can convert long double to (unsigned) long long + values correctly. */ +#cmakedefine H5_LDOUBLE_TO_LLONG_ACCURATE @H5_LDOUBLE_TO_LLONG_ACCURATE@ + /* Define if your system converts long double to (unsigned) long values with special algorithm. */ #cmakedefine H5_LDOUBLE_TO_LONG_SPECIAL @H5_LDOUBLE_TO_LONG_SPECIAL@ +/* Define if your system can convert (unsigned) long long to long double + values correctly. */ +#cmakedefine H5_LLONG_TO_LDOUBLE_CORRECT @H5_LLONG_TO_LDOUBLE_CORRECT@ + /* Define if your system can convert (unsigned) long to long double values with special algorithm. */ #cmakedefine H5_LONG_TO_LDOUBLE_SPECIAL @H5_LONG_TO_LDOUBLE_SPECIAL@ @@ -606,6 +614,9 @@ /* Version number of package */ #define H5_VERSION "@HDF5_PACKAGE_VERSION_STRING@" +/* Data accuracy is prefered to speed during data conversions */ +#cmakedefine H5_WANT_DATA_ACCURACY @H5_WANT_DATA_ACCURACY@ + /* Check exception handling functions during data conversions */ #cmakedefine H5_WANT_DCONV_EXCEPTION @H5_WANT_DCONV_EXCEPTION@ |