From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001 From: Vladimir Azarov Date: Tue, 1 Oct 2024 15:47:05 +0200 Subject: Initial version --- src/math/coshf.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 src/math/coshf.c (limited to 'src/math/coshf.c') diff --git a/src/math/coshf.c b/src/math/coshf.c new file mode 100644 index 0000000..e739cff --- /dev/null +++ b/src/math/coshf.c @@ -0,0 +1,33 @@ +#include "libm.h" + +float coshf(float x) +{ + union {float f; uint32_t i;} u = {.f = x}; + uint32_t w; + float t; + + /* |x| */ + u.i &= 0x7fffffff; + x = u.f; + w = u.i; + + /* |x| < log(2) */ + if (w < 0x3f317217) { + if (w < 0x3f800000 - (12<<23)) { + FORCE_EVAL(x + 0x1p120f); + return 1; + } + t = expm1f(x); + return 1 + t*t/(2*(1+t)); + } + + /* |x| < log(FLT_MAX) */ + if (w < 0x42b17217) { + t = expf(x); + return 0.5f*(t + 1/t); + } + + /* |x| > log(FLT_MAX) or nan */ + t = __expo2f(x, 1.0f); + return t; +} -- cgit v1.2.3