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[svn-r26374] Add CMake conversion test for H5_LONG_TO_LDOUBLE_SPECIAL and

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H5_LDOUBLE_TO_LONG_SPECIAL (imported from configure.ac).

Fixes: HDFFV-8936

Tested on: ostrich
This commit is contained in:
Jerome Soumagne 2015-03-05 17:26:08 -05:00
parent ca0a4d24b6
commit 967c265541
2 changed files with 120 additions and 8 deletions
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10
config/cmake/ConfigureChecks.cmake
View File

@ -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

118
config/cmake/ConversionTests.c
View File

@ -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)
{