Index: fusl/src/math/tanf.c |
diff --git a/fusl/src/math/tanf.c b/fusl/src/math/tanf.c |
new file mode 100644 |
index 0000000000000000000000000000000000000000..aba197777d3aeb0dfb5621f92ade9f0e7615223c |
--- /dev/null |
+++ b/fusl/src/math/tanf.c |
@@ -0,0 +1,64 @@ |
+/* origin: FreeBSD /usr/src/lib/msun/src/s_tanf.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 |
+t1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */ |
+t2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */ |
+t3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */ |
+t4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */ |
+ |
+float tanf(float x) |
+{ |
+ double y; |
+ uint32_t ix; |
+ unsigned 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 __tandf(x, 0); |
+ } |
+ if (ix <= 0x407b53d1) { /* |x| ~<= 5*pi/4 */ |
+ if (ix <= 0x4016cbe3) /* |x| ~<= 3pi/4 */ |
+ return __tandf((sign ? x+t1pio2 : x-t1pio2), 1); |
+ else |
+ return __tandf((sign ? x+t2pio2 : x-t2pio2), 0); |
+ } |
+ if (ix <= 0x40e231d5) { /* |x| ~<= 9*pi/4 */ |
+ if (ix <= 0x40afeddf) /* |x| ~<= 7*pi/4 */ |
+ return __tandf((sign ? x+t3pio2 : x-t3pio2), 1); |
+ else |
+ return __tandf((sign ? x+t4pio2 : x-t4pio2), 0); |
+ } |
+ |
+ /* tan(Inf or NaN) is NaN */ |
+ if (ix >= 0x7f800000) |
+ return x - x; |
+ |
+ /* argument reduction */ |
+ n = __rem_pio2f(x, &y); |
+ return __tandf(y, n&1); |
+} |