diff options
Diffstat (limited to 'lib/libm/common_source/sinh.c')
| -rw-r--r-- | lib/libm/common_source/sinh.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/lib/libm/common_source/sinh.c b/lib/libm/common_source/sinh.c index 0516849..075172c 100644 --- a/lib/libm/common_source/sinh.c +++ b/lib/libm/common_source/sinh.c @@ -38,7 +38,7 @@ static char sccsid[] = "@(#)sinh.c 8.1 (Berkeley) 6/4/93"; /* SINH(X) * RETURN THE HYPERBOLIC SINE OF X * DOUBLE PRECISION (VAX D format 56 bits, IEEE DOUBLE 53 BITS) - * CODED IN C BY K.C. NG, 1/8/85; + * CODED IN C BY K.C. NG, 1/8/85; * REVISED BY K.C. NG on 2/8/85, 3/7/85, 3/24/85, 4/16/85. * * Required system supported functions : @@ -50,14 +50,14 @@ static char sccsid[] = "@(#)sinh.c 8.1 (Berkeley) 6/4/93"; * * Method : * 1. reduce x to non-negative by sinh(-x) = - sinh(x). - * 2. + * 2. * * expm1(x) + expm1(x)/(expm1(x)+1) * 0 <= x <= lnovfl : sinh(x) := -------------------------------- * 2 * lnovfl <= x <= lnovfl+ln2 : sinh(x) := expm1(x)/2 (avoid overflow) * lnovfl+ln2 < x < INF : overflow to INF - * + * * * Special cases: * sinh(x) is x if x is +INF, -INF, or NaN. @@ -112,7 +112,7 @@ double x; {t=expm1(x); return(copysign((t+t/(one+t))*half,sign));} else if(x <= lnovfl+0.7) - /* subtract x by ln(2^(max+1)) and return 2^max*exp(x) + /* subtract x by ln(2^(max+1)) and return 2^max*exp(x) to avoid unnecessary overflow */ return(copysign(scalb(one+expm1((x-mln2hi)-mln2lo),max),sign)); |
