X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Frts%2FStgPrimFloat.c;h=5bd6aebb1cd1923608653d27599a247baca98af4;hb=28a464a75e14cece5db40f2765a29348273ff2d2;hp=2a739779271d9008f065b08fdf61e5ee81a93821;hpb=e58d0e9b37910fbf802804f534accb159235d539;p=ghc-hetmet.git diff --git a/ghc/rts/StgPrimFloat.c b/ghc/rts/StgPrimFloat.c index 2a73977..5bd6aeb 100644 --- a/ghc/rts/StgPrimFloat.c +++ b/ghc/rts/StgPrimFloat.c @@ -1,26 +1,41 @@ /* ----------------------------------------------------------------------------- - * $Id: StgPrimFloat.c,v 1.4 1999/02/18 12:26:12 simonm Exp $ * - * (c) The GHC Team, 1998-1999 + * (c) The GHC Team, 1998-2000 * * Miscellaneous support for floating-point primitives * * ---------------------------------------------------------------------------*/ +#include "PosixSource.h" #include "Rts.h" +#include + /* * Encoding and decoding Doubles. Code based on the HBC code * (lib/fltcode.c). */ +#ifdef _SHORT_LIMB +#define SIZEOF_LIMB_T SIZEOF_UNSIGNED_INT +#else +#ifdef _LONG_LONG_LIMB +#define SIZEOF_LIMB_T SIZEOF_UNSIGNED_LONG_LONG +#else +#define SIZEOF_LIMB_T SIZEOF_UNSIGNED_LONG +#endif +#endif + +#if SIZEOF_LIMB_T == 4 #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 */ +#elif SIZEOF_LIMB_T == 8 +#define GMP_BASE 18446744073709551616.0 #else -#define DNBIGIT 2 /* mantissa of a double will fit in two longs */ +#error Cannot cope with SIZEOF_LIMB_T -- please add definition of GMP_BASE #endif -#define FNBIGIT 1 /* for float, one long */ + +#define DNBIGIT ((SIZEOF_DOUBLE+SIZEOF_LIMB_T-1)/SIZEOF_LIMB_T) +#define FNBIGIT ((SIZEOF_FLOAT +SIZEOF_LIMB_T-1)/SIZEOF_LIMB_T) #if IEEE_FLOATING_POINT #define MY_DMINEXP ((DBL_MIN_EXP) - (DBL_MANT_DIG) - 1) @@ -47,17 +62,12 @@ StgDouble __encodeDouble (I_ size, StgByteArray ba, I_ e) /* result = s * 2^e */ { StgDouble r; - W_ *arr = (W_ *)ba; + 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! */ - 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 */ @@ -89,16 +99,15 @@ __int_encodeDouble (I_ j, I_ e) return r; } -#if ! FLOATS_AS_DOUBLES StgFloat __encodeFloat (I_ size, StgByteArray ba, I_ e) /* result = s * 2^e */ { StgFloat r; - W_ *arr = (W_ *)ba; + 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); 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 */ @@ -131,17 +140,20 @@ __int_encodeFloat (I_ j, I_ e) return r; } -#endif /* FLOATS_AS_DOUBLES */ - /* This only supports IEEE floating point */ void __decodeDouble (MP_INT *man, I_ *exp, StgDouble dbl) { /* Do some bit fiddling on IEEE */ - nat low, high; /* assuming 32 bit ints */ + unsigned int low, high; /* assuming 32 bit ints */ int sign, iexp; - union { double d; int i[2]; } u; /* assuming 32 bit ints, 64 bit double */ + union { double d; unsigned int i[2]; } u; /* assuming 32 bit ints, 64 bit double */ + + ASSERT(sizeof(unsigned int ) == 4 ); + ASSERT(sizeof(dbl ) == SIZEOF_DOUBLE); + ASSERT(sizeof(man->_mp_d[0]) == SIZEOF_LIMB_T); + ASSERT(DNBIGIT*SIZEOF_LIMB_T >= SIZEOF_DOUBLE); u.d = dbl; /* grab chunks of the double */ low = u.i[L]; @@ -176,13 +188,13 @@ __decodeDouble (MP_INT *man, I_ *exp, StgDouble dbl) } *exp = (I_) iexp; #if DNBIGIT == 2 - man->_mp_d[0] = low; - man->_mp_d[1] = high; + man->_mp_d[0] = (mp_limb_t)low; + man->_mp_d[1] = (mp_limb_t)high; #else #if DNBIGIT == 1 - man->_mp_d[0] = ((unsigned long)high) << 32 | (unsigned long)low; + man->_mp_d[0] = ((mp_limb_t)high) << 32 | (mp_limb_t)low; #else - error : error : error : Cannae cope with DNBIGIT +#error Cannot cope with DNBIGIT #endif #endif if (sign < 0) @@ -190,7 +202,6 @@ __decodeDouble (MP_INT *man, I_ *exp, StgDouble dbl) } } -#if ! FLOATS_AS_DOUBLES void __decodeFloat (MP_INT *man, I_ *exp, StgFloat flt) { @@ -198,6 +209,11 @@ __decodeFloat (MP_INT *man, I_ *exp, StgFloat flt) 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; @@ -226,15 +242,14 @@ __decodeFloat (MP_INT *man, I_ *exp, StgFloat flt) } } #if FNBIGIT == 1 - man->_mp_d[0] = high; + man->_mp_d[0] = (mp_limb_t)high; #else - error : error : error : Cannae cope with FNBIGIT +#error Cannot cope with FNBIGIT #endif if (sign < 0) 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 @@ -327,8 +342,7 @@ union stg_ieee754_dbl #ifdef IEEE_FLOATING_POINT StgInt -isDoubleNaN(d) -StgDouble d; +isDoubleNaN(StgDouble d) { union stg_ieee754_dbl u; @@ -342,8 +356,7 @@ StgDouble d; } StgInt -isDoubleInfinite(d) -StgDouble d; +isDoubleInfinite(StgDouble d) { union stg_ieee754_dbl u; @@ -358,8 +371,7 @@ StgDouble d; } StgInt -isDoubleDenormalized(d) -StgDouble d; +isDoubleDenormalized(StgDouble d) { union stg_ieee754_dbl u; @@ -381,8 +393,7 @@ StgDouble d; } StgInt -isDoubleNegativeZero(d) -StgDouble d; +isDoubleNegativeZero(StgDouble d) { union stg_ieee754_dbl u; @@ -409,12 +420,8 @@ StgDouble d; StgInt -isFloatNaN(f) -StgFloat f; +isFloatNaN(StgFloat f) { -# ifdef FLOATS_AS_DOUBLES - return (isDoubleNaN(f)); -# else union stg_ieee754_flt u; u.f = f; @@ -423,17 +430,11 @@ StgFloat 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; @@ -442,16 +443,11 @@ StgFloat 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; @@ -465,16 +461,11 @@ StgFloat 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; @@ -483,7 +474,6 @@ StgFloat f; u.ieee.negative && u.ieee.exponent == 0 && u.ieee.mantissa == 0); -# endif /* !FLOATS_AS_DOUBLES */ } #else /* ! IEEE_FLOATING_POINT */