diff options
Diffstat (limited to 'lib/msun/ld80/s_exp2l.c')
| -rw-r--r-- | lib/msun/ld80/s_exp2l.c | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/lib/msun/ld80/s_exp2l.c b/lib/msun/ld80/s_exp2l.c index 10c7da7..8a0dbe2 100644 --- a/lib/msun/ld80/s_exp2l.c +++ b/lib/msun/ld80/s_exp2l.c @@ -214,8 +214,8 @@ static const double tbl[TBLSIZE * 2] = { long double exp2l(long double x) { - union IEEEl2bits u; - long double r, z; + union IEEEl2bits u, v; + long double r, twopk, twopkp10000, z; uint32_t hx, ix, i0; int k; @@ -267,6 +267,14 @@ exp2l(long double x) i0 = (i0 & (TBLSIZE - 1)) << 1; u.e -= redux; z = x - u.e; + v.xbits.man = 1ULL << 63; + if (k >= LDBL_MIN_EXP) { + v.xbits.expsign = LDBL_MAX_EXP - 1 + k; + twopk = v.e; + } else { + v.xbits.expsign = LDBL_MAX_EXP - 1 + k + 10000; + twopkp10000 = v.e; + } /* Compute r = exp2l(y) = exp2lt[i0] * p(z). */ long double t_hi = tbl[i0]; @@ -277,15 +285,10 @@ exp2l(long double x) /* Scale by 2**k. */ if (k >= LDBL_MIN_EXP) { - if (k != 0) { - u.e = r; - u.xbits.expsign += k; - return (u.e); - } - return (r); + if (k == LDBL_MAX_EXP) + return (r * 2.0 * 0x1p16383L); + return (r * twopk); } else { - u.e = r; - u.xbits.expsign += k + 10000; - return (u.e * twom10000); + return (r * twopkp10000 * twom10000); } } |
