feat: add gzip and new headers

1 files changed, 99 insertions, 0 deletions

diff --git a/lib/libm/atan2l.c b/lib/libm/atan2l.c
new file mode 100644
index 00000000..f2f60986
--- /dev/null
+++ b/lib/libm/atan2l.c
@@ -0,0 +1,99 @@
+/* origin: FreeBSD /usr/src/lib/msun/src/e_atan2l.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 atan2.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 atan2l(long double y, long double x)
+{
+	return atan2(y, x);
+}
+#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
+#include "__invtrigl.h"
+
+long double atan2l(long double y, long double x)
+{
+	union ldshape ux, uy;
+	long double z;
+	int m, ex, ey;
+
+	if (isnan(x) || isnan(y))
+		return x + y;
+	if (x == 1)
+		return atanl(y);
+	ux.f = x;
+	uy.f = y;
+	ex = ux.i.se & 0x7fff;
+	ey = uy.i.se & 0x7fff;
+	m = 2 * (ux.i.se >> 15) | uy.i.se >> 15;
+	if (y == 0) {
+		switch (m) {
+		case 0:
+		case 1:
+			return y; /* atan(+-0,+anything)=+-0 */
+		case 2:
+			return 2 * pio2_hi; /* atan(+0,-anything) = pi */
+		case 3:
+			return -2 * pio2_hi; /* atan(-0,-anything) =-pi */
+		}
+	}
+	if (x == 0)
+		return m & 1 ? -pio2_hi : pio2_hi;
+	if (ex == 0x7fff) {
+		if (ey == 0x7fff) {
+			switch (m) {
+			case 0:
+				return pio2_hi / 2; /* atan(+INF,+INF) */
+			case 1:
+				return -pio2_hi / 2; /* atan(-INF,+INF) */
+			case 2:
+				return 1.5 * pio2_hi; /* atan(+INF,-INF) */
+			case 3:
+				return -1.5 * pio2_hi; /* atan(-INF,-INF) */
+			}
+		} else {
+			switch (m) {
+			case 0:
+				return 0.0; /* atan(+...,+INF) */
+			case 1:
+				return -0.0; /* atan(-...,+INF) */
+			case 2:
+				return 2 * pio2_hi; /* atan(+...,-INF) */
+			case 3:
+				return -2 * pio2_hi; /* atan(-...,-INF) */
+			}
+		}
+	}
+	if (ex + 120 < ey || ey == 0x7fff)
+		return m & 1 ? -pio2_hi : pio2_hi;
+	/* z = atan(|y/x|) without spurious underflow */
+	if ((m & 2) && ey + 120 < ex) /* |y/x| < 0x1p-120, x<0 */
+		z = 0.0;
+	else
+		z = atanl(fabsl(y / x));
+	switch (m) {
+	case 0:
+		return z; /* atan(+,+) */
+	case 1:
+		return -z; /* atan(-,+) */
+	case 2:
+		return 2 * pio2_hi - (z - 2 * pio2_lo); /* atan(+,-) */
+	default:					/* case 3 */
+		return (z - 2 * pio2_lo) - 2 * pio2_hi; /* atan(-,-) */
+	}
+}
+#endif