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(ereal_from_float, ereal_from_double): New functions.

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From-SVN: r4670
This commit is contained in:
Richard Stallman 1993-06-13 00:24:44 +00:00
parent 5d5ea90929
commit b31c244f31
1 changed files with 64 additions and 0 deletions
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64
gcc/real.c
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@ -4975,4 +4975,68 @@ enum machine_mode mode;
*nan++ = *p++;
}
/* Convert an SFmode target `float' value to a REAL_VALUE_TYPE.
This is the inverse of the function `etarsingle' invoked by
REAL_VALUE_TO_TARGET_SINGLE. */
REAL_VALUE_TYPE
ereal_from_float (f)
unsigned long f;
{
REAL_VALUE_TYPE r;
unsigned EMUSHORT s[2];
unsigned EMUSHORT e[NE];
/* Convert 32 bit integer to array of 16 bit pieces in target machine order.
This is the inverse operation to what the function `endian' does. */
#if WORDS_BIG_ENDIAN
s[0] = (unsigned EMUSHORT) (f >> 16);
s[1] = (unsigned EMUSHORT) f;
#else
s[0] = (unsigned EMUSHORT) f;
s[1] = (unsigned EMUSHORT) (f >> 16);
#endif
/* Convert and promote the target float to E-type. */
e24toe (s, e);
/* Output E-type to REAL_VALUE_TYPE. */
PUT_REAL (e, &r);
return r;
}
/* Convert a DFmode target `double' value to a REAL_VALUE_TYPE.
This is the inverse of the function `etardouble' invoked by
REAL_VALUE_TO_TARGET_DOUBLE.
The DFmode is stored as an array of longs (i.e., HOST_WIDE_INTs)
with 32 bits of the value per each long. The first element
of the input array holds the bits that would come first in the
target computer's memory. */
REAL_VALUE_TYPE
ereal_from_double (d)
unsigned long d[];
{
REAL_VALUE_TYPE r;
unsigned EMUSHORT s[4];
unsigned EMUSHORT e[NE];
/* Convert array of 32 bit pieces to equivalent array of 16 bit pieces.
This is the inverse of `endian'. */
#if WORDS_BIG_ENDIAN
s[0] = (unsigned EMUSHORT) (d[0] >> 16);
s[1] = (unsigned EMUSHORT) d[0];
s[2] = (unsigned EMUSHORT) (d[1] >> 16);
s[3] = (unsigned EMUSHORT) d[1];
#else
s[0] = (unsigned EMUSHORT) d[0];
s[1] = (unsigned EMUSHORT) (d[0] >> 16);
s[2] = (unsigned EMUSHORT) d[1];
s[3] = (unsigned EMUSHORT) (d[1] >> 16);
#endif
/* Convert target double to E-type. */
e53toe (s, e);
/* Output E-type to REAL_VALUE_TYPE. */
PUT_REAL (e, &r);
return r;
}
#endif /* EMU_NON_COMPILE not defined */