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Unified Diff: fusl/src/math/asinhl.c

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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Index: fusl/src/math/asinhl.c
diff --git a/fusl/src/math/asinhl.c b/fusl/src/math/asinhl.c
new file mode 100644
index 0000000000000000000000000000000000000000..8635f52e82381bdaff12badbd7cd170b2e05bf62
--- /dev/null
+++ b/fusl/src/math/asinhl.c
@@ -0,0 +1,41 @@
+#include "libm.h"
+
+#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
+long double asinhl(long double x)
+{
+ return asinh(x);
+}
+#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
+/* asinh(x) = sign(x)*log(|x|+sqrt(x*x+1)) ~= x - x^3/6 + o(x^5) */
+long double asinhl(long double x)
+{
+ union ldshape u = {x};
+ unsigned e = u.i.se & 0x7fff;
+ unsigned s = u.i.se >> 15;
+
+ /* |x| */
+ u.i.se = e;
+ x = u.f;
+
+ if (e >= 0x3fff + 32) {
+ /* |x| >= 0x1p32 or inf or nan */
+ x = logl(x) + 0.693147180559945309417232121458176568L;
+ } else if (e >= 0x3fff + 1) {
+ /* |x| >= 2 */
+ x = logl(2*x + 1/(sqrtl(x*x+1)+x));
+ } else if (e >= 0x3fff - 32) {
+ /* |x| >= 0x1p-32 */
+ x = log1pl(x + x*x/(sqrtl(x*x+1)+1));
+ } else {
+ /* |x| < 0x1p-32, raise inexact if x!=0 */
+ FORCE_EVAL(x + 0x1p120f);
+ }
+ return s ? -x : x;
+}
+#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
+// TODO: broken implementation to make things compile
+long double asinhl(long double x)
+{
+ return asinh(x);
+}
+#endif
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