/* -----------------------------------------------------------------------------
- * $Id: StgPrimFloat.c,v 1.4 1999/02/18 12:26:12 simonm Exp $
+ * $Id: StgPrimFloat.c,v 1.6 2000/11/07 13:30:41 simonmar Exp $
*
- * (c) The GHC Team, 1998-1999
+ * (c) The GHC Team, 1998-2000
*
* Miscellaneous support for floating-point primitives
*
*/
#define GMP_BASE 4294967296.0
-#if FLOATS_AS_DOUBLES /* defined in StgTypes.h */
-#define DNBIGIT 1 /* mantissa of a double will fit in one long */
-#else
#define DNBIGIT 2 /* mantissa of a double will fit in two longs */
-#endif
#define FNBIGIT 1 /* for float, one long */
#if IEEE_FLOATING_POINT
I_ i;
/* Convert MP_INT to a double; knows a lot about internal rep! */
- i = __abs(size)-1;
- if (i < 0) {
- r = 0.0;
- } else {
- for (r = arr[i], i--; i >= 0; i--)
- r = r * GMP_BASE + arr[i];
- }
+ 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 */
return r;
}
-#if ! FLOATS_AS_DOUBLES
StgFloat
__encodeFloat (I_ size, StgByteArray ba, I_ e) /* result = s * 2^e */
{
I_ i;
/* Convert MP_INT to a float; knows a lot about internal rep! */
- for(r = 0.0, i = __abs(size); i >= 0; i--)
+ for(r = 0.0, i = __abs(size)-1; i >= 0; i--)
r = (r * GMP_BASE) + arr[i];
/* Now raise to the exponent */
return r;
}
-#endif /* FLOATS_AS_DOUBLES */
-
/* This only supports IEEE floating point */
void
}
}
-#if ! FLOATS_AS_DOUBLES
void
__decodeFloat (MP_INT *man, I_ *exp, StgFloat flt)
{
man->_mp_size = -man->_mp_size;
}
}
-#endif /* FLOATS_AS_DOUBLES */
/* Convenient union types for checking the layout of IEEE 754 types -
based on defs in GNU libc <ieee754.h>
#ifdef IEEE_FLOATING_POINT
StgInt
-isDoubleNaN(d)
-StgDouble d;
+isDoubleNaN(StgDouble d)
{
union stg_ieee754_dbl u;
}
StgInt
-isDoubleInfinite(d)
-StgDouble d;
+isDoubleInfinite(StgDouble d)
{
union stg_ieee754_dbl u;
}
StgInt
-isDoubleDenormalized(d)
-StgDouble d;
+isDoubleDenormalized(StgDouble d)
{
union stg_ieee754_dbl u;
}
StgInt
-isDoubleNegativeZero(d)
-StgDouble d;
+isDoubleNegativeZero(StgDouble d)
{
union stg_ieee754_dbl u;
StgInt
-isFloatNaN(f)
-StgFloat f;
+isFloatNaN(StgFloat f)
{
-# ifdef FLOATS_AS_DOUBLES
- return (isDoubleNaN(f));
-# else
union stg_ieee754_flt u;
u.f = f;
return (
u.ieee.exponent == 255 /* 2^8 - 1 */ &&
u.ieee.mantissa != 0);
-
-# endif /* !FLOATS_AS_DOUBLES */
}
StgInt
-isFloatInfinite(f)
-StgFloat f;
+isFloatInfinite(StgFloat f)
{
-# ifdef FLOATS_AS_DOUBLES
- return (isDoubleInfinite(f));
-# else
union stg_ieee754_flt u;
u.f = f;
return (
u.ieee.exponent == 255 /* 2^8 - 1 */ &&
u.ieee.mantissa == 0);
-# endif /* !FLOATS_AS_DOUBLES */
}
StgInt
-isFloatDenormalized(f)
-StgFloat f;
+isFloatDenormalized(StgFloat f)
{
-# ifdef FLOATS_AS_DOUBLES
- return (isDoubleDenormalized(f));
-# else
union stg_ieee754_flt u;
u.f = f;
return (
u.ieee.exponent == 0 &&
u.ieee.mantissa != 0);
-#endif /* !FLOATS_AS_DOUBLES */
}
StgInt
-isFloatNegativeZero(f)
-StgFloat f;
+isFloatNegativeZero(StgFloat f)
{
-#ifdef FLOATS_AS_DOUBLES
- return (isDoubleNegativeZero(f));
-# else
union stg_ieee754_flt u;
u.f = f;
u.ieee.negative &&
u.ieee.exponent == 0 &&
u.ieee.mantissa == 0);
-# endif /* !FLOATS_AS_DOUBLES */
}
#else /* ! IEEE_FLOATING_POINT */