diff options
Diffstat (limited to 'lib/msun/src')
| -rw-r--r-- | lib/msun/src/e_logf.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/lib/msun/src/e_logf.c b/lib/msun/src/e_logf.c index 4e7142b..b47b77b 100644 --- a/lib/msun/src/e_logf.c +++ b/lib/msun/src/e_logf.c @@ -24,13 +24,11 @@ static const float ln2_hi = 6.9313812256e-01, /* 0x3f317180 */ ln2_lo = 9.0580006145e-06, /* 0x3717f7d1 */ two25 = 3.355443200e+07, /* 0x4c000000 */ -Lg1 = 6.6666668653e-01, /* 3F2AAAAB */ -Lg2 = 4.0000000596e-01, /* 3ECCCCCD */ -Lg3 = 2.8571429849e-01, /* 3E924925 */ -Lg4 = 2.2222198546e-01, /* 3E638E29 */ -Lg5 = 1.8183572590e-01, /* 3E3A3325 */ -Lg6 = 1.5313838422e-01, /* 3E1CD04F */ -Lg7 = 1.4798198640e-01; /* 3E178897 */ +/* |(log(1+s)-log(1-s))/s - Lg(s)| < 2**-34.24 (~[-4.95e-11, 4.97e-11]). */ +Lg1 = 0xaaaaaa.0p-24, /* 0.66666662693 */ +Lg2 = 0xccce13.0p-25, /* 0.40000972152 */ +Lg3 = 0x91e9ee.0p-25, /* 0.28498786688 */ +Lg4 = 0xf89e26.0p-26; /* 0.24279078841 */ static const float zero = 0.0; @@ -70,8 +68,8 @@ __ieee754_logf(float x) i = ix-(0x6147a<<3); w = z*z; j = (0x6b851<<3)-ix; - t1= w*(Lg2+w*(Lg4+w*Lg6)); - t2= z*(Lg1+w*(Lg3+w*(Lg5+w*Lg7))); + t1= w*(Lg2+w*Lg4); + t2= z*(Lg1+w*Lg3); i |= j; R = t2+t1; if(i>0) { |
