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authorSzabolcs Nagy <nsz@port70.net>2013-09-05 12:26:26 +0000
committerSzabolcs Nagy <nsz@port70.net>2013-09-05 12:26:26 +0000
commit101e6012856918440b5d7474739c3fc22a8d3b85 (patch)
tree04b79d042e6dd3dda62afeecc9e9c80627616867 /src/math/acoshl.c
parent02343946215a7ae03634c6490abcc69da68df589 (diff)
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math: fix acoshf on negative values
acosh(x) is invalid for x<1, acoshf tried to be clever using signed comparisions to handle all x<2 the same way, but the formula was wrong on large negative values.
Diffstat (limited to 'src/math/acoshl.c')
-rw-r--r--src/math/acoshl.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/math/acoshl.c b/src/math/acoshl.c
index de31fb75..4aa84acb 100644
--- a/src/math/acoshl.c
+++ b/src/math/acoshl.c
@@ -13,10 +13,10 @@ long double acoshl(long double x)
int e = u.i.se & 0x7fff;
if (e < 0x3fff + 1)
- /* x < 2, invalid if x < 1 or nan */
+ /* |x| < 2, invalid if x < 1 or nan */
return log1pl(x-1 + sqrtl((x-1)*(x-1)+2*(x-1)));
if (e < 0x3fff + 32)
- /* x < 0x1p32 */
+ /* |x| < 0x1p32 */
return logl(2*x - 1/(x+sqrtl(x*x-1)));
return logl(x) + 0.693147180559945309417232121458176568L;
}