diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/asinu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/asinu.c b/src/asinu.c index 3c7d7d527..befdd0db0 100644 --- a/src/asinu.c +++ b/src/asinu.c @@ -51,7 +51,8 @@ mpfr_asinu (mpfr_ptr y, mpfr_srcptr x, unsigned long u, mpfr_rnd_t rnd_mode) else /* necessarily x=0 */ { MPFR_ASSERTD(MPFR_IS_ZERO(x)); - /* asin(0)=0 with same sign (even when u=0?) */ + /* asin(0)=0 with same sign, even when u=0 to ensure + asinu(-x,u) = -asinu(x,u) */ MPFR_SET_ZERO (y); MPFR_SET_SAME_SIGN (y, x); MPFR_RET (0); /* exact result */ |