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-rw-r--r--sysdeps/libm-ieee754/s_frexpf.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_frexpf.c b/sysdeps/libm-ieee754/s_frexpf.c
new file mode 100644
index 0000000000..a984457a87
--- /dev/null
+++ b/sysdeps/libm-ieee754/s_frexpf.c
@@ -0,0 +1,53 @@
+/* s_frexpf.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.
+ * ====================================================
+ */
+
+#if defined(LIBM_SCCS) && !defined(lint)
+static char rcsid[] = "$NetBSD: s_frexpf.c,v 1.5 1995/05/10 20:47:26 jtc Exp $";
+#endif
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+static const float
+#else
+static float
+#endif
+two25 =  3.3554432000e+07; /* 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(ix>=0x7f800000||(ix==0)) return x;	/* 0,inf,nan */
+	if (ix<0x00800000) {		/* subnormal */
+	    x *= two25;
+	    GET_FLOAT_WORD(hx,x);
+	    ix = hx&0x7fffffff;
+	    *eptr = -25;
+	}
+	*eptr += (ix>>23)-126;
+	hx = (hx&0x807fffff)|0x3f000000;
+	*(int*)&x = hx;
+	return x;
+}
+weak_alias (__frexpf, frexpf)