micropython: add micropython component

components/language/micropython/lib/libm/sf_frexp.c

@@ -0,0 +1,70 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * These math functions are taken from newlib-nano-2, the newlib/libm/math
+ * directory, available from https://github.com/32bitmicro/newlib-nano-2.
+ *
+ * Appropriate copyright headers are reproduced below.
+ */
+
+/* sf_frexp.c -- float version of s_frexp.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 =  3.3554432000e+07f; /* 0x4c000000 */
+
+#ifdef __STDC__
+	float frexpf(float x, int *eptr)
+#else
+	float frexpf(x, eptr)
+	float x; int *eptr;
+#endif
+{
+	__int32_t hx, ix;
+	GET_FLOAT_WORD(hx,x);
+	ix = 0x7fffffff&hx;
+	*eptr = 0;
+	if(!FLT_UWORD_IS_FINITE(ix)||FLT_UWORD_IS_ZERO(ix)) return x;	/* 0,inf,nan */
+	if (FLT_UWORD_IS_SUBNORMAL(ix)) {		/* subnormal */
+	    x *= two25;
+	    GET_FLOAT_WORD(hx,x);
+	    ix = hx&0x7fffffff;
+	    *eptr = -25;
+	}
+	*eptr += (ix>>23)-126;
+	hx = (hx&0x807fffff)|0x3f000000;
+	SET_FLOAT_WORD(x,hx);
+	return x;
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double frexp(double x, int *eptr)
+#else
+	double frexp(x, eptr)
+	double x; int *eptr;
+#endif
+{
+	return (double) frexpf((float) x, eptr);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */