upload sdk

git-svn-id: svn://kolibrios.org@4349 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/newlib/math/sf_scalbln.c

@@ -0,0 +1,71 @@
+/* s_scalbnf.c -- float version of s_scalbn.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 "fdlibm.h"
+
+#ifdef __STDC__
+static const float
+#else
+static float
+#endif
+two25   =  3.355443200e+07,	/* 0x4c000000 */
+twom25  =  2.9802322388e-08,	/* 0x33000000 */
+huge   = 1.0e+30,
+tiny   = 1.0e-30;
+
+#ifdef __STDC__
+	float scalblnf (float x, long int n)
+#else
+	float scalblnf (x,n)
+	float x; long int n;
+#endif
+{
+	__int32_t k,ix;
+	GET_FLOAT_WORD(ix,x);
+        k = (ix&0x7f800000)>>23;		/* extract exponent */
+        if (k==0) {				/* 0 or subnormal x */
+            if ((ix&0x7fffffff)==0) return x; /* +-0 */
+	    x *= two25;
+	    GET_FLOAT_WORD(ix,x);
+	    k = ((ix&0x7f800000)>>23) - 25;
+	    }
+        if (k==0xff) return x+x;		/* NaN or Inf */
+        k = k+n;
+        if (n> 50000 || k >  0xfe)
+	  return huge*copysignf(huge,x); /* overflow  */
+	if (n< -50000)
+	  return tiny*copysignf(tiny,x);	/*underflow*/
+        if (k > 0) 				/* normal result */
+	    {SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23)); return x;}
+        if (k <= -25)
+	    return tiny*copysignf(tiny,x);	/*underflow*/
+        k += 25;				/* subnormal result */
+	SET_FLOAT_WORD(x,(ix&0x807fffff)|(k<<23));
+        return x*twom25;
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double scalbln (double x, long int n)
+#else
+	double scalbln (x,n)
+	double x; long int n;
+#endif
+{
+	return (double) scalblnf((float) x, n);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */