(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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@10313 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 30 insertions, 3 deletions

diff --git a/gcc/config/fp-bit.c b/gcc/config/fp-bit.c
index 3c17f402e23..6c7491e35b6 100644
--- a/gcc/config/fp-bit.c
+++ b/gcc/config/fp-bit.c
@@ -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)