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| author | Szabolcs Nagy <nsz@port70.net> | 2021-02-05 18:48:19 +0000 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2021-02-10 14:06:36 -0500 |
| commit | c4c38e6364323b6d83ba3428464e19987b981d7a (patch) | |
| tree | 80cad290a8fd040c05a8d25df56548e13b4f7c74 /src/termios/cfsetospeed.c | |
| parent | 074932c84d34273821e3bfc2511e60a5ce78b8d8 (diff) | |
| download | musl-c4c38e6364323b6d83ba3428464e19987b981d7a.tar.gz musl-c4c38e6364323b6d83ba3428464e19987b981d7a.tar.bz2 musl-c4c38e6364323b6d83ba3428464e19987b981d7a.tar.xz musl-c4c38e6364323b6d83ba3428464e19987b981d7a.zip | |
math: fix acoshf for negative inputs
on some negative inputs (e.g. -0x1.1e6ae8p+5) acoshf failed to return
nan. ensure that negative inputs result nan without introducing new
branches. this was tried before in
commit 101e6012856918440b5d7474739c3fc22a8d3b85
math: fix acoshf on negative values
but that fix was wrong. there are 3 formulas used:
log1p(x-1 + sqrt((x-1)*(x-1)+2*(x-1)))
log(2*x - 1/(x+sqrt(x*x-1)))
log(x) + 0.693147180559945309417232121458176568
the first fails on large negative inputs (may compute log1p(0) or
log1p(inf)), the second one fails on some mid range or large negative
inputs (may compute log(large) or log(inf)) and the last one fails on
-0 (returns -inf).
Diffstat (limited to 'src/termios/cfsetospeed.c')
0 files changed, 0 insertions, 0 deletions