feat: add gzip and new headers

1 files changed, 68 insertions, 0 deletions

diff --git a/lib/libm/acosf.c b/lib/libm/acosf.c
new file mode 100644
index 00000000..a428e8d6
--- /dev/null
+++ b/lib/libm/acosf.c
@@ -0,0 +1,68 @@
+/* origin: FreeBSD /usr/src/lib/msun/src/e_acosf.c */
+/*
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+#include "libm.h"
+
+static const float pio2_hi = 1.5707962513e+00, /* 0x3fc90fda */
+	pio2_lo = 7.5497894159e-08,	       /* 0x33a22168 */
+	pS0 = 1.6666586697e-01, pS1 = -4.2743422091e-02,
+		   pS2 = -8.6563630030e-03, qS1 = -7.0662963390e-01;
+
+static float R(float z)
+{
+	float_t p, q;
+	p = z * (pS0 + z * (pS1 + z * pS2));
+	q = 1.0f + z * qS1;
+	return p / q;
+}
+
+float acosf(float x)
+{
+	float z, w, s, c, df;
+	uint32_t hx, ix;
+
+	GET_FLOAT_WORD(hx, x);
+	ix = hx & 0x7fffffff;
+	/* |x| >= 1 or nan */
+	if (ix >= 0x3f800000) {
+		if (ix == 0x3f800000) {
+			if (hx >> 31)
+				return 2 * pio2_hi + 0x1p-120f;
+			return 0;
+		}
+		return 0 / (x - x);
+	}
+	/* |x| < 0.5 */
+	if (ix < 0x3f000000) {
+		if (ix <= 0x32800000) /* |x| < 2**-26 */
+			return pio2_hi + 0x1p-120f;
+		return pio2_hi - (x - (pio2_lo - x * R(x * x)));
+	}
+	/* x < -0.5 */
+	if (hx >> 31) {
+		z = (1 + x) * 0.5f;
+		s = sqrtf(z);
+		w = R(z) * s - pio2_lo;
+		return 2 * (pio2_hi - (s + w));
+	}
+	/* x > 0.5 */
+	z = (1 - x) * 0.5f;
+	s = sqrtf(z);
+	GET_FLOAT_WORD(hx, s);
+	SET_FLOAT_WORD(df, hx & 0xfffff000);
+	c = (z - df * df) / (s + df);
+	w = R(z) * s + c;
+	return 2 * (df + w);
+}