/* -----------------------------------------------------------------------------
*
+ * (c) Lennart Augustsson
* (c) The GHC Team, 1998-2000
*
* Miscellaneous support for floating-point primitives
ASSERT(sizeof(int ) == 4 );
r = (StgDouble)((unsigned int)j_high);
- r *= 4294967296; /* exp2f(32); */
+ r *= 4294967296.0; /* exp2f(32); */
r += (StgDouble)((unsigned int)j_low);
/* Now raise to the exponent */
return r;
}
+/* Special version for words */
+StgDouble
+__word_encodeDouble (W_ j, I_ e)
+{
+ StgDouble r;
+
+ r = (StgDouble)j;
+
+ /* Now raise to the exponent */
+ if ( r != 0.0 ) /* Lennart suggests this avoids a bug in MIPS's ldexp */
+ r = ldexp(r, e);
+
+ return r;
+}
+
/* Special version for small Integers */
StgDouble
__int_encodeDouble (I_ j, I_ e)
return r;
}
+/* Special version for small positive Integers */
+StgFloat
+__word_encodeFloat (W_ j, I_ e)
+{
+ StgFloat r;
+
+ r = (StgFloat)j;
+
+ /* Now raise to the exponent */
+ if ( r != 0.0 ) /* Lennart suggests this avoids a bug in MIPS's ldexp */
+ r = ldexp(r, e);
+
+ return r;
+}
+
/* This only supports IEEE floating point */
void
}
void
-__decodeDouble_2Int (I_ *man_high, I_ *man_low, I_ *exp, StgDouble dbl)
+__decodeDouble_2Int (I_ *man_sign, W_ *man_high, W_ *man_low, I_ *exp, StgDouble dbl)
{
/* Do some bit fiddling on IEEE */
unsigned int low, high; /* assuming 32 bit ints */
*exp = (I_) iexp;
*man_low = low;
*man_high = high;
- if (sign < 0) {
- *man_high = - *man_high;
- }
- }
-}
-
-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;
+ *man_sign = (sign < 0) ? -1 : 1;
}
}