#define __abs(a) (( (a) >= 0 ) ? (a) : (-(a)))
StgDouble
-__encodeDouble (I_ size, StgByteArray ba, I_ e) /* result = s * 2^e */
-{
- StgDouble r;
- const mp_limb_t *const arr = (const mp_limb_t *)ba;
- I_ i;
-
- /* Convert MP_INT to a double; knows a lot about internal rep! */
- for(r = 0.0, i = __abs(size)-1; i >= 0; i--)
- r = (r * GMP_BASE) + arr[i];
-
- /* Now raise to the exponent */
- if ( r != 0.0 ) /* Lennart suggests this avoids a bug in MIPS's ldexp */
- r = ldexp(r, e);
-
- /* sign is encoded in the size */
- if (size < 0)
- r = -r;
-
- return r;
-}
-
-StgDouble
__2Int_encodeDouble (I_ j_high, I_ j_low, I_ e)
{
StgDouble r;
return r;
}
-StgFloat
-__encodeFloat (I_ size, StgByteArray ba, I_ e) /* result = s * 2^e */
-{
- StgFloat r;
- const mp_limb_t *arr = (const mp_limb_t *)ba;
- I_ i;
-
- /* Convert MP_INT to a float; knows a lot about internal rep! */
- for(r = 0.0, i = __abs(size)-1; i >= 0; i--)
- r = (r * GMP_BASE) + arr[i];
-
- /* Now raise to the exponent */
- if ( r != 0.0 ) /* Lennart suggests this avoids a bug in MIPS's ldexp */
- r = ldexp(r, e);
-
- /* sign is encoded in the size */
- if (size < 0)
- r = -r;
-
- return r;
-}
-
/* Special version for small Integers */
StgFloat
__int_encodeFloat (I_ j, I_ e)
}
}
-void
-__decodeFloat (MP_INT *man, I_ *exp, StgFloat flt)
-{
- /* Do some bit fiddling on IEEE */
- int high, sign; /* assuming 32 bit ints */
- union { float f; int i; } u; /* assuming 32 bit float and int */
-
- ASSERT(sizeof(int ) == 4 );
- ASSERT(sizeof(flt ) == SIZEOF_FLOAT );
- ASSERT(sizeof(man->_mp_d[0]) == SIZEOF_LIMB_T);
- ASSERT(FNBIGIT*SIZEOF_LIMB_T >= SIZEOF_FLOAT );
-
- u.f = flt; /* grab the float */
- high = u.i;
-
- /* we know the MP_INT* passed in has size zero, so we realloc
- no matter what.
- */
- man->_mp_alloc = FNBIGIT;
-
- if ((high & ~FMSBIT) == 0) {
- man->_mp_size = 0;
- *exp = 0;
- } else {
- man->_mp_size = FNBIGIT;
- *exp = ((high >> 23) & 0xff) + MY_FMINEXP;
- sign = high;
-
- high &= FHIGHBIT-1;
- if (*exp != MY_FMINEXP) /* don't add hidden bit to denorms */
- high |= FHIGHBIT;
- else {
- (*exp)++;
- /* A denorm, normalize the mantissa */
- while (! (high & FHIGHBIT)) {
- high <<= 1;
- (*exp)--;
- }
- }
-#if FNBIGIT == 1
- man->_mp_d[0] = (mp_limb_t)high;
-#else
-#error Cannot cope with FNBIGIT
-#endif
- if (sign < 0)
- man->_mp_size = -man->_mp_size;
- }
-}
-
/* Convenient union types for checking the layout of IEEE 754 types -
based on defs in GNU libc <ieee754.h>
*/