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(FLO_union_type): Remove bitfields to set sign... 

(FLO_union_type): Remove bitfields to set sign, exponent, and
mantissa, and add value_raw field, which is an integer of the
appropriate type.  If _DEBUG_BITFLOAT is defined, provide little and
big endian bitfields.  If the macro FLOAT_BIT_ORDER_MISMATCH is
defined, use explicit bitfields.
(pack_d, unpack_d): Switch to use value_raw and explicit shifts and
masks so that we don't have to worry about whether the target is big
or little endian unless FLOAT_BIT_ORDER_MISMATCH is defined.  If
single precision floating point, rename to pack_f and unpack_f, so
there is no confusion in the debugger.

From-SVN: r10313
This commit is contained in:
Richard Kenner 1995-09-11 18:53:34 -04:00
parent 446c894728
commit d5f2740875
1 changed files with 30 additions and 3 deletions
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33
gcc/config/fp-bit.c
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@ -243,6 +243,16 @@ typedef union
FLO_type value;
fractype value_raw;
#ifdef FLOAT_WORD_ORDER_MISMATCH
struct
{
fractype fraction:FRACBITS __attribute__ ((packed));
unsigned int exp:EXPBITS __attribute__ ((packed));
unsigned int sign:1 __attribute__ ((packed));
}
bits;
#endif
#ifdef _DEBUG_BITFLOAT
halffractype l[2];
@ -404,9 +414,16 @@ pack_d ( fp_number_type * src)
/* We previously used bitfields to store the number, but this doesn't
handle little/big endian systems conviently, so use shifts and
masks */
#ifdef FLOAT_WORD_ORDER_MISMATCH
dst.bits.fraction = fraction;
dst.bits.exp = exp;
dst.bits.sign = sign;
#else
dst.value_raw = fraction & ((((fractype)1) << FRACBITS) - (fractype)1);
dst.value_raw |= ((fractype) (exp & ((1 << EXPBITS) - 1))) << FRACBITS;
dst.value_raw |= ((fractype) (sign & 1)) << (FRACBITS | EXPBITS);
#endif
return dst.value;
}
@ -416,9 +433,19 @@ unpack_d (FLO_union_type * src, fp_number_type * dst)
/* We previously used bitfields to store the number, but this doesn't
handle little/big endian systems conviently, so use shifts and
masks */
fractype fraction = src->value_raw & ((((fractype)1) << FRACBITS) - (fractype)1);
int exp = ((int)(src->value_raw >> FRACBITS)) & ((1 << EXPBITS) - 1);
int sign = ((int)(src->value_raw >> (FRACBITS + EXPBITS))) & 1;
fractype fraction;
int exp;
int sign;
#ifdef FLOAT_WORD_ORDER_MISMATCH
fraction = src->bits.fraction;
exp = src->bits.exp;
sign = src->bits.sign;
#else
fraction = src->value_raw & ((((fractype)1) << FRACBITS) - (fractype)1);
exp = ((int)(src->value_raw >> FRACBITS)) & ((1 << EXPBITS) - 1);
sign = ((int)(src->value_raw >> (FRACBITS + EXPBITS))) & 1;
#endif
dst->sign = sign;
if (exp == 0)