summaryrefslogtreecommitdiffstats
path: root/configure
diff options
context:
space:
mode:
authorRaymond Lu <songyulu@hdfgroup.org>2010-10-28 16:34:31 (GMT)
committerRaymond Lu <songyulu@hdfgroup.org>2010-10-28 16:34:31 (GMT)
commite05528194deb238fa71820c45c425b5953b1b938 (patch)
treea5948c65388e464a12a7024a515362f76b4ce0cd /configure
parent71bf205c79d20738bf8f5a19907a80e428369d50 (diff)
downloadhdf5-e05528194deb238fa71820c45c425b5953b1b938.zip
hdf5-e05528194deb238fa71820c45c425b5953b1b938.tar.gz
hdf5-e05528194deb238fa71820c45c425b5953b1b938.tar.bz2
[svn-r19693] Bug 2008 - IBM Power6 Linux uses special conversion algorithms to convert some values from long
double to (unsigned) long and from (unsigned) long to long double. I added tests in configure.in to detect these algorithms. Before I can figure out them, I disable the tests in dt_arith.c. Tested on jam, heiwa, amani, IBM Power6 Linux machine in Holland (huygens.sara.nl).
Diffstat (limited to 'configure')
-rwxr-xr-xconfigure199
1 files changed, 198 insertions, 1 deletions
diff --git a/configure b/configure
index 9d62b16..ed4128f 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
#! /bin/sh
-# From configure.in Id: configure.in 19511 2010-10-05 13:28:37Z hdftest .
+# From configure.in Id: configure.in 19671 2010-10-27 01:54:11Z koziol .
# Guess values for system-dependent variables and create Makefiles.
# Generated by GNU Autoconf 2.67 for HDF5 1.8.7-snap1.
#
@@ -27621,6 +27621,202 @@ else
$as_echo "no" >&6; }
fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if using special algorithm to convert long double to (unsigned) long values" >&5
+$as_echo_n "checking if using special algorithm to convert long double to (unsigned) long values... " >&6; }
+
+if test ${ac_cv_sizeof_long_double} = 0; then
+ hdf5_cv_ldouble_to_long_special=${hdf5_cv_ldouble_to_long_special=no}
+else
+ if test "${hdf5_cv_ldouble_to_long_special+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+else
+ if test "$cross_compiling" = yes; then :
+ { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot run test program while cross compiling
+See \`config.log' for more details" "$LINENO" 5; }
+else
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+ int main(void)
+ {
+ long double ld = 20041683600089727.779961L;
+ long ll;
+ unsigned long ull;
+ unsigned char s[16];
+ unsigned char s2[8];
+ int ret = 1;
+
+ if(sizeof(long double) == 16 && sizeof(long) == 8) {
+ /*make sure the long double type has 16 bytes in size and
+ * 11 bits of exponent. If it is,
+ *the bit sequence should be like below. It's not
+ *a decent way to check but this info isn't available. */
+ memcpy(s, &ld, 16);
+ if(s[0]==0x43 && s[1]==0x51 && s[2]==0xcc && s[3]==0xf3 &&
+ s[4]==0x85 && s[5]==0xeb && s[6]==0xc8 && s[7]==0xa0 &&
+ s[8]==0xbf && s[9]==0xcc && s[10]==0x2a && s[11]==0x3c) {
+
+ /* Assign the hexadecimal value of long double type. */
+ s[0]=0x43; s[1]=0x51; s[2]=0xcc; s[3]=0xf3;
+ s[4]=0x85; s[5]=0xeb; s[6]=0xc8; s[7]=0xa0;
+ s[8]=0xbf; s[9]=0xcc; s[10]=0x2a; s[11]=0x3c;
+ s[12]=0x3d; s[13]=0x85; s[14]=0x56; s[15]=0x20;
+
+ memcpy(&ld, s, 16);
+
+ ll = (long)ld;
+ memcpy(s2, &ll, 8);
+
+ /* The library's algorithm converts it to 0x 00 47 33 ce 17 af 22 82
+ * and gets wrong value 20041683600089730 on the IBM Power6 Linux.
+ * But the IBM Power6 Linux converts it to 0x00 47 33 ce 17 af 22 7f
+ * and gets the correct value 20041683600089727. It uses some special
+ * algorithm. We're going to define the macro and skip the test until
+ * we can figure out how they do it. */
+ if(s2[0]==0x00 && s2[1]==0x47 && s2[2]==0x33 && s2[3]==0xce &&
+ s2[4]==0x17 && s2[5]==0xaf && s2[6]==0x22 && s2[7]==0x7f)
+ ret = 0;
+
+ ull = (unsigned long)ld;
+ memcpy(s2, &ull, 8);
+
+ /* The unsigned long is the same as signed long. */
+ if(s2[0]==0x00 && s2[1]==0x47 && s2[2]==0x33 && s2[3]==0xce &&
+ s2[4]==0x17 && s2[5]==0xaf && s2[6]==0x22 && s2[7]==0x7f)
+ ret = 0;
+ }
+ }
+
+ done:
+ exit(ret);
+ }
+
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+ hdf5_cv_ldouble_to_long_special=yes
+else
+ hdf5_cv_ldouble_to_long_special=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+ conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+fi
+
+fi
+
+if test ${hdf5_cv_ldouble_to_long_special} = "yes"; then
+
+$as_echo "#define LDOUBLE_TO_LONG_SPECIAL 1" >>confdefs.h
+
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if using special algorithm to convert (unsigned) long to long double values" >&5
+$as_echo_n "checking if using special algorithm to convert (unsigned) long to long double values... " >&6; }
+
+if test ${ac_cv_sizeof_long_double} = 0; then
+ hdf5_cv_long_to_ldouble_special=${hdf5_cv_long_to_ldouble_special=no}
+else
+ if test "${hdf5_cv_long_to_ldouble_special+set}" = set; then :
+ $as_echo_n "(cached) " >&6
+else
+ if test "$cross_compiling" = yes; then :
+ { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot run test program while cross compiling
+See \`config.log' for more details" "$LINENO" 5; }
+else
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+ int main(void)
+ {
+ long double ld;
+ long ll;
+ unsigned long ull;
+ unsigned char s[16];
+ int flag=0, ret=1;
+
+ /*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)==8) {
+ ll = 0x003fffffffffffffL;
+ ld = (long double)ll;
+ memcpy(s, &ld, 16);
+ /* The library converts the value to 0x434fffffffffffff8000000000000000.
+ * In decimal it is 18014398509481982.000000, one value short of the original.
+ * The IBM Power6 Linux converts it to 0x4350000000000000bff0000000000000.
+ * The value is correct in decimal. It uses some special
+ * algorithm. We're going to define the macro and skip the test until
+ * we can figure out how they do it. */
+ if(s[0]==0x43 && s[1]==0x50 && s[2]==0x00 && s[3]==0x00 &&
+ s[4]==0x00 && s[5]==0x00 && s[6]==0x00 && s[7]==0x00 &&
+ s[8]==0xbf && s[9]==0xf0 && s[10]==0x00 && s[11]==0x00 &&
+ s[12]==0x00 && s[13]==0x00 && s[14]==0x00 && s[15]==0x00)
+ ret = 0;
+ }
+ if(flag==1 && sizeof(unsigned long)==8) {
+ ull = 0xffffffffffffffffUL;
+ ld = (long double)ull;
+ memcpy(s, &ld, 16);
+ /* Use a different value from signed long to test. The problem is the same
+ * for both long and unsigned long. The value is 18446744073709551615.
+ * The library converts the value to 0x43effffffffffffffe000000000000000.
+ * In decimal it's 18446744073709548544.000000, very different from the original.
+ * The IBM Power6 Linux converts it to 0x43f0000000000000bff0000000000000.
+ * The value is correct in decimal. It uses some special
+ * algorithm. We're going to define the macro and skip the test until
+ * we can figure out how they do it. */
+ if(s[0]==0x43 && s[1]==0xf0 && s[2]==0x00 && s[3]==0x00 &&
+ s[4]==0x00 && s[5]==0x00 && s[6]==0x00 && s[7]==0x00 &&
+ s[8]==0xbf && s[9]==0xf0 && s[10]==0x00 && s[11]==0x00 &&
+ s[12]==0x00 && s[13]==0x00 && s[14]==0x00 && s[15]==0x00)
+ ret = 0;
+ }
+ done:
+ exit(ret);
+ }
+
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+ hdf5_cv_long_to_ldouble_special=yes
+else
+ hdf5_cv_long_to_ldouble_special=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+ conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+fi
+
+fi
+
+if test ${hdf5_cv_long_to_ldouble_special} = "yes"; then
+
+$as_echo "#define LONG_TO_LDOUBLE_SPECIAL 1" >>confdefs.h
+
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if correctly converting long double to (unsigned) long long values" >&5
$as_echo_n "checking if correctly converting long double to (unsigned) long long values... " >&6; }
@@ -27701,6 +27897,7 @@ else
$as_echo "no" >&6; }
fi
+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if correctly converting (unsigned) long long to long double values" >&5
$as_echo_n "checking if correctly converting (unsigned) long long to long double values... " >&6; }