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authorRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
committerRich Felker <dalias@aerifal.cx>2011-02-12 00:22:29 -0500
commit0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch)
tree6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/math/s_sinf.c
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initial check-in, version 0.5.0 v0.5.0
Diffstat (limited to 'src/math/s_sinf.c')
-rw-r--r--src/math/s_sinf.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/src/math/s_sinf.c b/src/math/s_sinf.c
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+/* s_sinf.c -- float version of s_sin.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 <math.h>
+#include "math_private.h"
+
+float
+sinf(float x)
+{
+        float y[2],z=0.0;
+        int32_t n, ix;
+
+        GET_FLOAT_WORD(ix,x);
+
+    /* |x| ~< pi/4 */
+        ix &= 0x7fffffff;
+        if(ix <= 0x3f490fd8) return __kernel_sinf(x,z,0);
+
+    /* sin(Inf or NaN) is NaN */
+        else if (ix>=0x7f800000) return x-x;
+
+    /* argument reduction needed */
+        else {
+            n = __ieee754_rem_pio2f(x,y);
+            switch(n&3) {
+                case 0: return  __kernel_sinf(y[0],y[1],1);
+                case 1: return  __kernel_cosf(y[0],y[1]);
+                case 2: return -__kernel_sinf(y[0],y[1],1);
+                default:
+                        return -__kernel_cosf(y[0],y[1]);
+            }
+        }
+}