system/glibc
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Rewrite handling of integral exponent.

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This commit is contained in:
Ulrich Drepper 1997-04-21 11:36:58 +00:00
parent ecc1637a09
commit 334ca6573b
1 changed files with 17 additions and 32 deletions
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49
sysdeps/m68k/fpu/e_pow.c
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@ -80,51 +80,36 @@ s(__ieee754_pow) (float_type x, float_type y)
z = 1 / z;
if (m81(__signbit) (x))
{
float_type temp = m81(__rint) (y);
if (y != temp)
if (y != m81(__rint) (y))
{
if (x == -1)
z = 0.0/0.0;
}
else
{
if (sizeof (float_type) == sizeof (float))
{
long i = (long) y;
if (i & 1)
z = -z;
}
else
{
long long i = (long long) y;
if ((float_type) i == y && i & 1)
z = -z;
}
}
goto maybe_negate;
}
return z;
}
if (x < 0.0)
{
float_type temp = m81(__rint) (y);
if (y == temp)
if (y == m81(__rint) (y))
{
long long i = (long long) y;
z = m81(__ieee754_exp) (y * m81(__ieee754_log) (-x));
if (sizeof (float_type) == sizeof (float))
{
long i = (long) y;
if (i & 1)
z = -z;
}
else
{
/* If the conversion to long long was inexact assume that y
is an even integer. */
if ((float_type) i == y && i & 1)
z = -z;
}
maybe_negate:
/* We always use the long double format, since y is already in
this format and rounding won't change the result. */
{
int32_t exponent;
u_int32_t i0, i1;
GET_LDOUBLE_WORDS (exponent, i0, i1, y);
exponent = (exponent & 0x7fff) - 0x3fff;
if (exponent <= 31
? i0 & (1 << (31 - exponent))
: (exponent <= 63
&& i1 & (1 << (63 - exponent))))
z = -z;
}
}
else
z = 0.0/0.0;