feat: add gzip and new headers

1 files changed, 81 insertions, 0 deletions

diff --git a/lib/libm/log10f.c b/lib/libm/log10f.c
new file mode 100644
index 00000000..c4f9e2ca
--- /dev/null
+++ b/lib/libm/log10f.c
@@ -0,0 +1,81 @@
+/* origin: FreeBSD /usr/src/lib/msun/src/e_log10f.c */
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+/*
+ * See comments in log10.c.
+ */
+
+#include <math.h>
+#include <stdint.h>
+
+static const float ivln10hi = 4.3432617188e-01, /* 0x3ede6000 */
+	ivln10lo = -3.1689971365e-05,		/* 0xb804ead9 */
+	log10_2hi = 3.0102920532e-01,		/* 0x3e9a2080 */
+	log10_2lo = 7.9034151668e-07,		/* 0x355427db */
+	/* |(log(1+s)-log(1-s))/s - Lg(s)| < 2**-34.24 (~[-4.95e-11, 4.97e-11]).
+	 */
+	Lg1 = 0xaaaaaa.0p-24, /* 0.66666662693 */
+	Lg2 = 0xccce13.0p-25, /* 0.40000972152 */
+	Lg3 = 0x91e9ee.0p-25, /* 0.28498786688 */
+	Lg4 = 0xf89e26.0p-26; /* 0.24279078841 */
+
+float log10f(float x)
+{
+	union {
+		float f;
+		uint32_t i;
+	} u = { x };
+	float_t hfsq, f, s, z, R, w, t1, t2, dk, hi, lo;
+	uint32_t ix;
+	int k;
+
+	ix = u.i;
+	k = 0;
+	if (ix < 0x00800000 || ix >> 31) { /* x < 2**-126  */
+		if (ix << 1 == 0)
+			return -1 / (x * x); /* log(+-0)=-inf */
+		if (ix >> 31)
+			return (x - x) / 0.0f; /* log(-#) = NaN */
+		/* subnormal number, scale up x */
+		k -= 25;
+		x *= 0x1p25f;
+		u.f = x;
+		ix = u.i;
+	} else if (ix >= 0x7f800000) {
+		return x;
+	} else if (ix == 0x3f800000)
+		return 0;
+
+	/* reduce x into [sqrt(2)/2, sqrt(2)] */
+	ix += 0x3f800000 - 0x3f3504f3;
+	k += (int)(ix >> 23) - 0x7f;
+	ix = (ix & 0x007fffff) + 0x3f3504f3;
+	u.i = ix;
+	x = u.f;
+
+	f = x - 1.0f;
+	s = f / (2.0f + f);
+	z = s * s;
+	w = z * z;
+	t1 = w * (Lg2 + w * Lg4);
+	t2 = z * (Lg1 + w * Lg3);
+	R = t2 + t1;
+	hfsq = 0.5f * f * f;
+
+	hi = f - hfsq;
+	u.f = hi;
+	u.i &= 0xfffff000;
+	hi = u.f;
+	lo = f - hi - hfsq + s * (hfsq + R);
+	dk = k;
+	return dk * log10_2lo + (lo + hi) * ivln10lo + lo * ivln10hi +
+	       hi * ivln10hi + dk * log10_2hi;
+}