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| author | Szabolcs Nagy <nsz@port70.net> | 2013-09-05 12:26:26 +0000 |
|---|---|---|
| committer | Szabolcs Nagy <nsz@port70.net> | 2013-09-05 12:26:26 +0000 |
| commit | 101e6012856918440b5d7474739c3fc22a8d3b85 (patch) | |
| tree | 04b79d042e6dd3dda62afeecc9e9c80627616867 /src/math/acoshl.c | |
| parent | 02343946215a7ae03634c6490abcc69da68df589 (diff) | |
| download | musl-101e6012856918440b5d7474739c3fc22a8d3b85.tar.gz musl-101e6012856918440b5d7474739c3fc22a8d3b85.tar.bz2 musl-101e6012856918440b5d7474739c3fc22a8d3b85.tar.xz musl-101e6012856918440b5d7474739c3fc22a8d3b85.zip | |
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.c | 4 |
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; } |