Hi,
I am sorry to bother everyone. I have had no trouble building 1.6.3
with the Intel compiler. Now I am having to repeat the exercise for
GNU. In opal/util/arch.h (about line 260) is the function below. I am
getting an error that LDBL_MANT_DIG is not declared. I can not seem to
find where it is declared. Any hints would be appreciated. Thanks.
Ray
static inline int32_t opal_arch_ldisintel( void )
{
long double ld = 2.0;
int i, j;
uint32_t* pui = (uint32_t*)(void*)&ld;
j = LDBL_MANT_DIG / 32;
i = (LDBL_MANT_DIG % 32) - 1;
if( opal_arch_isbigendian() ) { /* big endian */
j = (sizeof(long double) / sizeof(unsigned int)) - j;
if( i < 0 ) {
i = 31;
j = j+1;
}
} else {
if( i < 0 ) {
i = 31;
j = j-1;
}
}
return (pui[j] & (1 << i) ? 1 : 0);
}
Function is described:
/* we must find which representation of long double is used
* intel or sparc. Both of them represent the long doubles using a close to
* IEEE representation (seeeeeee..emmm...m) where the mantissa look like
* 1.????. For the intel representaion the 1 is explicit, and for the sparc
* the first one is implicit. If we take the number 2.0 the exponent is 1
* and the mantissa is 1.0 (the sign of course should be 0). So if we check
* for the first one in the binary representation of the number, we will
* find the bit from the exponent, so the next one should be the begining
* of the mantissa. If it's 1 then we have an intel representaion, if not
* we have a sparc one. QED
*/
