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(FLO_union_type): Add words field if double precision to get at the separate words.

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(FLO_union_type): Add words field if double precision to get at the separate
words.
(FLO_union_type, pack_d, unpack_d): Use FLOAT_BIT_ORDER_MISMATCH to
determine when the bitfields need to be reversed, and
FLOAT_WORD_ORDER_MISMATCH when the words need to be reversed.

From-SVN: r10357
This commit is contained in:
Richard Kenner 1995-09-15 17:06:46 -04:00
parent 6136d594d9
commit 89c89d1107
1 changed files with 23 additions and 5 deletions
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28
gcc/config/fp-bit.c
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@ -243,7 +243,11 @@ typedef union
FLO_type value;
fractype value_raw;
#ifdef FLOAT_WORD_ORDER_MISMATCH
#ifndef FLOAT
halffractype words[2];
#endif
#ifdef FLOAT_BIT_ORDER_MISMATCH
struct
{
fractype fraction:FRACBITS __attribute__ ((packed));
@ -254,8 +258,6 @@ typedef union
#endif
#ifdef _DEBUG_BITFLOAT
halffractype l[2];
struct
{
unsigned int sign:1 __attribute__ ((packed));
@ -414,7 +416,7 @@ 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
#ifdef FLOAT_BIT_ORDER_MISMATCH
dst.bits.fraction = fraction;
dst.bits.exp = exp;
dst.bits.sign = sign;
@ -424,6 +426,14 @@ pack_d ( fp_number_type * src)
dst.value_raw |= ((fractype) (sign & 1)) << (FRACBITS | EXPBITS);
#endif
#if defined(FLOAT_WORD_ORDER_MISMATCH) && !defined(FLOAT)
{
halffractype tmp = dst.words[0];
dst.words[0] = dst.words[1];
dst.words[1] = tmp;
}
#endif
return dst.value;
}
@ -437,7 +447,15 @@ unpack_d (FLO_union_type * src, fp_number_type * dst)
int exp;
int sign;
#ifdef FLOAT_WORD_ORDER_MISMATCH
#if defined(FLOAT_WORD_ORDER_MISMATCH) && !defined(FLOAT)
FLO_union_type swapped;
swapped.words[0] = src->words[1];
swapped.words[1] = src->words[0];
src = &swapped;
#endif
#ifdef FLOAT_BIT_ORDER_MISMATCH
fraction = src->bits.fraction;
exp = src->bits.exp;
sign = src->bits.sign;