From 885f5974cdf65b59415837ae97f5a14ef1350670 Mon Sep 17 00:00:00 2001
From: Kacper <kacper@mail.openlinux.dev>
Date: Tue, 9 Dec 2025 19:20:15 +0100
Subject: feat: add gzip and new headers

---
 lib/libm/asinl.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 lib/libm/asinl.c

(limited to 'lib/libm/asinl.c')

diff --git a/lib/libm/asinl.c b/lib/libm/asinl.c
new file mode 100644
index 00000000..8dd0268c
--- /dev/null
+++ b/lib/libm/asinl.c
@@ -0,0 +1,72 @@
+/* origin: FreeBSD /usr/src/lib/msun/src/e_asinl.c */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunSoft, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+/*
+ * See comments in asin.c.
+ * Converted to long double by David Schultz <das@FreeBSD.ORG>.
+ */
+
+#include "libm.h"
+
+#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
+long double asinl(long double x)
+{
+	return asin(x);
+}
+#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
+#include "__invtrigl.h"
+#if LDBL_MANT_DIG == 64
+#define CLOSETO1(u)    (u.i.m >> 56 >= 0xf7)
+#define CLEARBOTTOM(u) (u.i.m &= -1ULL << 32)
+#elif LDBL_MANT_DIG == 113
+#define CLOSETO1(u)    (u.i.top >= 0xee00)
+#define CLEARBOTTOM(u) (u.i.lo = 0)
+#endif
+
+long double asinl(long double x)
+{
+	union ldshape u = { x };
+	long double z, r, s;
+	uint16_t e = u.i.se & 0x7fff;
+	int sign = u.i.se >> 15;
+
+	if (e >= 0x3fff) { /* |x| >= 1 or nan */
+		/* asin(+-1)=+-pi/2 with inexact */
+		if (x == 1 || x == -1)
+			return x * pio2_hi + 0x1p-120f;
+		return 0 / (x - x);
+	}
+	if (e < 0x3fff - 1) { /* |x| < 0.5 */
+		if (e < 0x3fff - (LDBL_MANT_DIG + 1) / 2) {
+			/* return x with inexact if x!=0 */
+			FORCE_EVAL(x + 0x1p120f);
+			return x;
+		}
+		return x + x * __invtrigl_R(x * x);
+	}
+	/* 1 > |x| >= 0.5 */
+	z = (1.0 - fabsl(x)) * 0.5;
+	s = sqrtl(z);
+	r = __invtrigl_R(z);
+	if (CLOSETO1(u)) {
+		x = pio2_hi - (2 * (s + s * r) - pio2_lo);
+	} else {
+		long double f, c;
+		u.f = s;
+		CLEARBOTTOM(u);
+		f = u.f;
+		c = (z - f * f) / (s + f);
+		x = 0.5 * pio2_hi -
+		    (2 * s * r - (pio2_lo - 2 * c) - (0.5 * pio2_hi - 2 * f));
+	}
+	return sign ? -x : x;
+}
+#endif
-- 
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