1 files changed, 47 insertions, 0 deletions
diff --git a/ports/sysdeps/m68k/m680x0/fpu/e_ilogb.c b/ports/sysdeps/m68k/m680x0/fpu/e_ilogb.c
new file mode 100644
index 0000000000..41c597a012
--- /dev/null
+++ b/ports/sysdeps/m68k/m680x0/fpu/e_ilogb.c
@@ -0,0 +1,47 @@
+/* Copyright (C) 1996-2012 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <math.h>
+#include "mathimpl.h"
+
+#ifndef SUFF
+#define SUFF
+#endif
+#ifndef float_type
+#define float_type double
+#endif
+
+#define CONCATX(a,b) __CONCAT(a,b)
+#define s(name) CONCATX(name,SUFF)
+#define m81(func) __m81_u(s(func))
+
+int
+s(__ieee754_ilogb) (float_type x)
+{
+  float_type result;
+  unsigned long x_cond;
+
+  x_cond = __m81_test (x);
+  /* We must return consistent values for zero and NaN.  */
+  if (x_cond & __M81_COND_ZERO)
+    return FP_ILOGB0;
+  if (x_cond & (__M81_COND_NAN | __M81_COND_INF))
+    return FP_ILOGBNAN;
+
+  __asm ("fgetexp%.x %1, %0" : "=f" (result) : "f" (x));
+  return (int) result;
+}