diff options
Diffstat (limited to 'libc/sysdeps/ieee754/ldbl-128ibm/e_jnl.c')
| -rw-r--r-- | libc/sysdeps/ieee754/ldbl-128ibm/e_jnl.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/libc/sysdeps/ieee754/ldbl-128ibm/e_jnl.c b/libc/sysdeps/ieee754/ldbl-128ibm/e_jnl.c index 0eea74567..2114753f8 100644 --- a/libc/sysdeps/ieee754/ldbl-128ibm/e_jnl.c +++ b/libc/sysdeps/ieee754/ldbl-128ibm/e_jnl.c @@ -286,7 +286,16 @@ __ieee754_jnl (n, x) } } } - b = (t * __ieee754_j0l (x) / b); + /* j0() and j1() suffer enormous loss of precision at and + * near zero; however, we know that their zero points never + * coincide, so just choose the one further away from zero. + */ + z = __ieee754_j0l (x); + w = __ieee754_j1l (x); + if (fabsl (z) >= fabsl (w)) + b = (t * z / b); + else + b = (t * w / a); } } if (sgn == 1) @@ -294,6 +303,7 @@ __ieee754_jnl (n, x) else return b; } +strong_alias (__ieee754_jnl, __jnl_finite) #ifdef __STDC__ long double @@ -400,3 +410,4 @@ __ieee754_ynl (n, x) else return -b; } +strong_alias (__ieee754_ynl, __ynl_finite) |