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author | Dana Robinson <43805+derobins@users.noreply.github.com> | 2023-06-15 16:13:22 (GMT) |
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committer | GitHub <noreply@github.com> | 2023-06-15 16:13:22 (GMT) |
commit | fcdd0ab9dc93871fa600aface194b294947fad1b (patch) | |
tree | 305a955e98f15290a2953021f5565e45b29657be /configure.ac | |
parent | 9a8c5810ed37d353522cbb26014698881cd52ce4 (diff) | |
download | hdf5-fcdd0ab9dc93871fa600aface194b294947fad1b.zip hdf5-fcdd0ab9dc93871fa600aface194b294947fad1b.tar.gz hdf5-fcdd0ab9dc93871fa600aface194b294947fad1b.tar.bz2 |
Revert long double checks (#3133)
* Revert "Remove long double conversion work-arounds (#3097)"
This reverts commit 1e1dac1dac58fa18f6b7788346d1ba7d3315b0f9.
* Update comments to reflect newer systems
Diffstat (limited to 'configure.ac')
-rw-r--r-- | configure.ac | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 3c952e8..1a87357 100644 --- a/configure.ac +++ b/configure.ac @@ -3384,6 +3384,27 @@ else fi ## ---------------------------------------------------------------------- +## Decide whether the data accuracy has higher priority during data +## conversions. If not, some hard conversions will still be preferred even +## though the data may be wrong (for example, some compilers don't +## support denormalized floating values) to maximize speed. +## +AC_MSG_CHECKING([whether data accuracy is guaranteed during data conversions]) +AC_ARG_ENABLE([dconv-accuracy], + [AS_HELP_STRING([--enable-dconv-accuracy], + [if data accuracy is guaranteed during + data conversions [default=yes]])], + [DATA_ACCURACY=$enableval], [DATA_ACCURACY=yes]) + +if test "$DATA_ACCURACY" = "yes"; then + AC_MSG_RESULT([yes]) + AC_DEFINE([WANT_DATA_ACCURACY], [1], + [Data accuracy is preferred to speed during data conversions]) +else + AC_MSG_RESULT([no]) +fi + +## ---------------------------------------------------------------------- ## Set the flag to indicate that the machine has window style pathname, ## that is, "drive-letter:\" (e.g. "C:") or "drive-letter:/" (e.g. "C:/"). ## (This flag should be _unset_ for all machines, except for Windows, where @@ -3403,6 +3424,158 @@ case "`uname`" in esac ## ---------------------------------------------------------------------- +## Set the flag to indicate that the machine is using a special algorithm to convert +## 'long double' to '(unsigned) long' values. (This flag should only be set for +## the IBM Power Linux. When the bit sequence of long double is +## 0x4351ccf385ebc8a0bfcc2a3c3d855620, the converted value of (unsigned)long +## is 0x004733ce17af227f, not the same as the library's conversion to 0x004733ce17af2282. +## The machine's conversion gets the correct value. We define the macro and disable +## this kind of test until we figure out what algorithm they use. +## +## CROSS-COMPILING: Assume 'no' +AC_MSG_CHECKING([if using special algorithm to convert long double to (unsigned) long values]) + +## NOTE: Place all configure test programs into cmake's source file, then use a preprocessor directive +## to select the proper test program. This is done by echoing the #define and cat'ing the cmake +## source file. (HDFFV-9467) + +TEST_SRC="`(echo \"#define H5_LDOUBLE_TO_LONG_SPECIAL_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`" + +if test ${ac_cv_sizeof_long_double} = 0; then + hdf5_cv_ldouble_to_long_special=${hdf5_cv_ldouble_to_long_special=no} +else + AC_CACHE_VAL([hdf5_cv_ldouble_to_long_special], + [AC_RUN_IFELSE( + [AC_LANG_SOURCE([$TEST_SRC])] + , [hdf5_cv_ldouble_to_long_special=yes], [hdf5_cv_ldouble_to_long_special=no], [hdf5_cv_ldouble_to_long_special=no])]) +fi + +if test ${hdf5_cv_ldouble_to_long_special} = "yes"; then + AC_DEFINE([LDOUBLE_TO_LONG_SPECIAL], [1], + [Define if your system converts long double to (unsigned) long values with special algorithm.]) + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) +fi + +## ---------------------------------------------------------------------- +## Set the flag to indicate that the machine is using a special algorithm +## to convert some values of '(unsigned) long' to 'long double' values. +## (This flag should be off for all machines, except for IBM Power Linux, +## when the bit sequences are 003fff..., 007fff..., 00ffff..., 01ffff..., +## ..., 7fffff..., the compiler uses a unknown algorithm. We define a +## macro and skip the test for now until we know about the algorithm. +## +## CROSS-COMPILING: Assume 'no' +AC_MSG_CHECKING([if using special algorithm to convert (unsigned) long to long double values]) + +TEST_SRC="`(echo \"#define H5_LONG_TO_LDOUBLE_SPECIAL_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`" + +if test ${ac_cv_sizeof_long_double} = 0; then + hdf5_cv_long_to_ldouble_special=${hdf5_cv_long_to_ldouble_special=no} +else + AC_CACHE_VAL([hdf5_cv_long_to_ldouble_special], + [AC_RUN_IFELSE( + [AC_LANG_SOURCE([$TEST_SRC])] + , [hdf5_cv_long_to_ldouble_special=yes], [hdf5_cv_long_to_ldouble_special=no], [hdf5_cv_long_to_ldouble_special=no])]) +fi + +if test ${hdf5_cv_long_to_ldouble_special} = "yes"; then + AC_DEFINE([LONG_TO_LDOUBLE_SPECIAL], [1], + [Define if your system can convert (unsigned) long to long double values with special algorithm.]) + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) +fi + +## ---------------------------------------------------------------------- +## 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, SGI IRIX64 6.5 and +## Powerpc Linux using XL compilers. +## 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. +## +## CROSS-COMPILING: Assume 'yes' +AC_MSG_CHECKING([if correctly converting long double to (unsigned) long long values]) + +TEST_SRC="`(echo \"#define H5_LDOUBLE_TO_LLONG_ACCURATE_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`" + +if test ${ac_cv_sizeof_long_double} = 0; then + hdf5_cv_ldouble_to_llong_accurate=${hdf5_cv_ldouble_to_llong_accurate=no} +else + AC_CACHE_VAL([hdf5_cv_ldouble_to_llong_accurate], + [AC_RUN_IFELSE([AC_LANG_SOURCE([$TEST_SRC])], + [hdf5_cv_ldouble_to_llong_accurate=yes], [hdf5_cv_ldouble_to_llong_accurate=no], [hdf5_cv_ldouble_to_llong_accurate=yes])]) +fi + +if test ${hdf5_cv_ldouble_to_llong_accurate} = "yes"; then + AC_DEFINE([LDOUBLE_TO_LLONG_ACCURATE], [1], + [Define if your system can convert long double to (unsigned) long long values correctly.]) + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) +fi + + +## ---------------------------------------------------------------------- +## 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 and Powerpc Linux using +## XL compilers. +## When the bit sequences are 003fff..., 007fff..., 00ffff..., 01ffff..., +## ..., 7fffff..., the converted values are twice as big as they should be. +## +## CROSS-COMPILING: Assume 'yes' +AC_MSG_CHECKING([if correctly converting (unsigned) long long to long double values]) + +TEST_SRC="`(echo \"#define H5_LLONG_TO_LDOUBLE_CORRECT_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`" + +if test ${ac_cv_sizeof_long_double} = 0; then + hdf5_cv_llong_to_ldouble_correct=${hdf5_cv_llong_to_ldouble_correct=no} +else + AC_CACHE_VAL([hdf5_cv_llong_to_ldouble_correct], + [AC_RUN_IFELSE([AC_LANG_SOURCE([$TEST_SRC])], + [hdf5_cv_llong_to_ldouble_correct=yes], [hdf5_cv_llong_to_ldouble_correct=no], [hdf5_cv_llong_to_ldouble_correct=yes])]) +fi + +if test ${hdf5_cv_llong_to_ldouble_correct} = "yes"; then + AC_DEFINE([LLONG_TO_LDOUBLE_CORRECT], [1], + [Define if your system can convert (unsigned) long long to long double values correctly.]) + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) +fi + +## ---------------------------------------------------------------------- +## Set the flag to indicate that the machine is IBM ppc64le and cannot +## accurately convert some long double values. +## +## CROSS-COMPILING: Assume 'yes' +AC_MSG_CHECKING([if the system is IBM ppc64le and cannot correctly convert some long double values]) + +TEST_SRC="`(echo \"#define H5_DISABLE_SOME_LDOUBLE_CONV_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`" + +if test ${ac_cv_sizeof_long_double} = 0; then + hdf5_cv_disable_some_ldouble_conv=${hdf5_cv_disable_some_ldouble_conv=no} +else + AC_CACHE_VAL([hdf5_cv_disable_some_ldouble_conv], + [AC_RUN_IFELSE([AC_LANG_SOURCE([$TEST_SRC])], + [hdf5_cv_disable_some_ldouble_conv=yes], [hdf5_cv_disable_some_ldouble_conv=no], [hdf5_cv_disable_some_ldouble_conv=yes])]) +fi + +if test ${hdf5_cv_disable_some_ldouble_conv} = "yes"; then + AC_DEFINE([DISABLE_SOME_LDOUBLE_CONV], [1], + [Define if your system is IBM ppc64le and cannot convert some long double values correctly.]) + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) +fi + +## ---------------------------------------------------------------------- ## Set some variables for general configuration information to be saved ## and installed with the libraries (used to generate libhdf5.settings). ## |