summaryrefslogtreecommitdiff
path: root/lib/mlibc/options/ansi/musl-generic-math/cosh.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/mlibc/options/ansi/musl-generic-math/cosh.c')
-rw-r--r--lib/mlibc/options/ansi/musl-generic-math/cosh.c40
1 files changed, 0 insertions, 40 deletions
diff --git a/lib/mlibc/options/ansi/musl-generic-math/cosh.c b/lib/mlibc/options/ansi/musl-generic-math/cosh.c
deleted file mode 100644
index 100f823..0000000
--- a/lib/mlibc/options/ansi/musl-generic-math/cosh.c
+++ /dev/null
@@ -1,40 +0,0 @@
-#include "libm.h"
-
-/* cosh(x) = (exp(x) + 1/exp(x))/2
- * = 1 + 0.5*(exp(x)-1)*(exp(x)-1)/exp(x)
- * = 1 + x*x/2 + o(x^4)
- */
-double cosh(double x)
-{
- union {double f; uint64_t i;} u = {.f = x};
- uint32_t w;
- double t;
-
- /* |x| */
- u.i &= (uint64_t)-1/2;
- x = u.f;
- w = u.i >> 32;
-
- /* |x| < log(2) */
- if (w < 0x3fe62e42) {
- if (w < 0x3ff00000 - (26<<20)) {
- /* raise inexact if x!=0 */
- FORCE_EVAL(x + 0x1p120f);
- return 1;
- }
- t = expm1(x);
- return 1 + t*t/(2*(1+t));
- }
-
- /* |x| < log(DBL_MAX) */
- if (w < 0x40862e42) {
- t = exp(x);
- /* note: if x>log(0x1p26) then the 1/t is not needed */
- return 0.5*(t + 1/t);
- }
-
- /* |x| > log(DBL_MAX) or nan */
- /* note: the result is stored to handle overflow */
- t = __expo2(x);
- return t;
-}