feat: add gzip and new headers

1 files changed, 79 insertions, 0 deletions

diff --git a/lib/libm/sinf.c b/lib/libm/sinf.c
new file mode 100644
index 00000000..f835ef8a
--- /dev/null
+++ b/lib/libm/sinf.c
@@ -0,0 +1,79 @@
+/* origin: FreeBSD /usr/src/lib/msun/src/s_sinf.c */
+/*
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ * Optimized by Bruce D. Evans.
+ */
+/*
+ * ====================================================
+ * 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"
+
+/* Small multiples of pi/2 rounded to double precision. */
+static const double s1pio2 = 1 * M_PI_2, /* 0x3FF921FB, 0x54442D18 */
+	s2pio2 = 2 * M_PI_2,		 /* 0x400921FB, 0x54442D18 */
+	s3pio2 = 3 * M_PI_2,		 /* 0x4012D97C, 0x7F3321D2 */
+	s4pio2 = 4 * M_PI_2;		 /* 0x401921FB, 0x54442D18 */
+
+float sinf(float x)
+{
+	double y;
+	uint32_t ix;
+	int n, sign;
+
+	GET_FLOAT_WORD(ix, x);
+	sign = ix >> 31;
+	ix &= 0x7fffffff;
+
+	if (ix <= 0x3f490fda) {	       /* |x| ~<= pi/4 */
+		if (ix < 0x39800000) { /* |x| < 2**-12 */
+			/* raise inexact if x!=0 and underflow if subnormal */
+			FORCE_EVAL(ix < 0x00800000 ? x / 0x1p120f :
+						     x + 0x1p120f);
+			return x;
+		}
+		return __sindf(x);
+	}
+	if (ix <= 0x407b53d1) {		/* |x| ~<= 5*pi/4 */
+		if (ix <= 0x4016cbe3) { /* |x| ~<= 3pi/4 */
+			if (sign)
+				return -__cosdf(x + s1pio2);
+			else
+				return __cosdf(x - s1pio2);
+		}
+		return __sindf(sign ? -(x + s2pio2) : -(x - s2pio2));
+	}
+	if (ix <= 0x40e231d5) {		/* |x| ~<= 9*pi/4 */
+		if (ix <= 0x40afeddf) { /* |x| ~<= 7*pi/4 */
+			if (sign)
+				return __cosdf(x + s3pio2);
+			else
+				return -__cosdf(x - s3pio2);
+		}
+		return __sindf(sign ? x + s4pio2 : x - s4pio2);
+	}
+
+	/* sin(Inf or NaN) is NaN */
+	if (ix >= 0x7f800000)
+		return x - x;
+
+	/* general argument reduction needed */
+	n = __rem_pio2f(x, &y);
+	switch (n & 3) {
+	case 0:
+		return __sindf(y);
+	case 1:
+		return __cosdf(y);
+	case 2:
+		return __sindf(-y);
+	default:
+		return -__cosdf(y);
+	}
+}