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-rw-r--r--config/cmake/ConfigureChecks.cmake10
-rw-r--r--config/cmake/ConversionTests.c118
2 files changed, 120 insertions, 8 deletions
diff --git a/config/cmake/ConfigureChecks.cmake b/config/cmake/ConfigureChecks.cmake
index a709a4d..80b44cb 100644
--- a/config/cmake/ConfigureChecks.cmake
+++ b/config/cmake/ConfigureChecks.cmake
@@ -370,10 +370,7 @@ H5ConversionTests (H5_FP_TO_INTEGER_OVERFLOW_WORKS "Checking IF overflows norma
# 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.
#
-if (H5_LDOUBLE_TO_LONG_SPECIAL MATCHES ^H5_LDOUBLE_TO_LONG_SPECIAL$)
- set (H5_LDOUBLE_TO_LONG_SPECIAL 0 CACHE INTERNAL "Define if your system converts long double to (unsigned) long values with special algorithm")
- message (STATUS "Checking IF your system converts long double to (unsigned) long values with special algorithm... no")
-endif (H5_LDOUBLE_TO_LONG_SPECIAL MATCHES ^H5_LDOUBLE_TO_LONG_SPECIAL$)
+H5ConversionTests (H5_LDOUBLE_TO_LONG_SPECIAL "Checking IF your system converts long double to (unsigned) long values with special algorithm")
# ----------------------------------------------------------------------
# Set the flag to indicate that the machine is using a special algorithm
# to convert some values of '(unsigned) long' to 'long double' values.
@@ -382,10 +379,7 @@ endif (H5_LDOUBLE_TO_LONG_SPECIAL MATCHES ^H5_LDOUBLE_TO_LONG_SPECIAL$)
# ..., 7fffff..., the compiler uses a unknown algorithm. We define a
# macro and skip the test for now until we know about the algorithm.
#
-if (H5_LONG_TO_LDOUBLE_SPECIAL MATCHES ^H5_LONG_TO_LDOUBLE_SPECIAL$)
- set (H5_LONG_TO_LDOUBLE_SPECIAL 0 CACHE INTERNAL "Define if your system can convert (unsigned) long to long double values with special algorithm")
- message (STATUS "Checking IF your system can convert (unsigned) long to long double values with special algorithm... no")
-endif (H5_LONG_TO_LDOUBLE_SPECIAL MATCHES ^H5_LONG_TO_LDOUBLE_SPECIAL$)
+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
diff --git a/config/cmake/ConversionTests.c b/config/cmake/ConversionTests.c
index 1ee9842..010ee32 100644
--- a/config/cmake/ConversionTests.c
+++ b/config/cmake/ConversionTests.c
@@ -90,6 +90,124 @@ done:
#endif
+#ifdef H5_LDOUBLE_TO_LONG_SPECIAL_TEST
+
+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);
+}
+
+#endif
+
+#ifdef H5_LONG_TO_LDOUBLE_SPECIAL_TEST
+
+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);
+}
+
+#endif
+
#ifdef H5_LDOUBLE_TO_LLONG_ACCURATE_TEST
int main(void)
{