/* Round toward nearest, breaking ties away from zero.
- Copyright (C) 2007, 2009, 2010 Free Software Foundation, Inc.
+ Copyright (C) 2007, 2010-2011 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include <config.h>
-#include <float.h>
+/* Specification. */
#include <math.h>
+#include <float.h>
+
+#undef MIN
+
#ifdef USE_LONG_DOUBLE
# define ROUND roundl
# define FLOOR floorl
# define CEIL ceill
# define DOUBLE long double
# define MANT_DIG LDBL_MANT_DIG
+# define MIN LDBL_MIN
# define L_(literal) literal##L
# define HAVE_FLOOR_AND_CEIL HAVE_FLOORL_AND_CEILL
#elif ! defined USE_FLOAT
# define CEIL ceil
# define DOUBLE double
# define MANT_DIG DBL_MANT_DIG
+# define MIN DBL_MIN
# define L_(literal) literal
# define HAVE_FLOOR_AND_CEIL 1
#else /* defined USE_FLOAT */
# define CEIL ceilf
# define DOUBLE float
# define MANT_DIG FLT_MANT_DIG
+# define MIN FLT_MIN
# define L_(literal) literal##f
# define HAVE_FLOOR_AND_CEIL HAVE_FLOORF_AND_CEILF
#endif
+/* -0.0. See minus-zero.h. */
+#if defined __hpux || defined __sgi || defined __ICC
+# define MINUS_ZERO (-MIN * MIN)
+#else
+# define MINUS_ZERO L_(-0.0)
+#endif
+
/* If we're being included from test-round2[f].c, it already defined names for
our round implementations. Otherwise, pick the preferred implementation for
this machine. */
{
/* Avoid rounding error for x = -(0.5 - 2^(-MANT_DIG-1)). */
if (z > - L_(0.5))
- z = L_(0.0);
+ z = MINUS_ZERO;
/* Avoid rounding errors for values near -2^k, where k >= MANT_DIG-1. */
else if (z > -TWO_MANT_DIG)
{