/* Test of rounding towards negative infinity.
- Copyright (C) 2007-2008 Free Software Foundation, Inc.
+ Copyright (C) 2007-2013 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
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
+/* When this test fails on some platform, build it together with the gnulib
+ module 'fprintf-posix' for optimal debugging output. */
+
#include <config.h>
#include <math.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
-#include <stdlib.h>
#include "isnanf-nolibm.h"
+#include "macros.h"
-#define ASSERT(expr) \
- do \
- { \
- if (!(expr)) \
- { \
- fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
- fflush (stderr); \
- abort (); \
- } \
- } \
- while (0)
+/* MSVC with option -fp:strict refuses to compile constant initializers that
+ contain floating-point operations. Pacify this compiler. */
+#ifdef _MSC_VER
+# pragma fenv_access (off)
+#endif
/* The reference implementation, taken from lib/floor.c. */
if (z > L_(0.0))
{
+ /* For 0 < x < 1, return +0.0 even if the current rounding mode is
+ FE_DOWNWARD. */
+ if (z < L_(1.0))
+ z = L_(0.0);
/* Avoid rounding errors for values near 2^k, where k >= MANT_DIG-1. */
- if (z < TWO_MANT_DIG)
+ else if (z < TWO_MANT_DIG)
{
/* Round to the next integer (nearest or up or down, doesn't matter). */
z += TWO_MANT_DIG;
}
else if (z < L_(0.0))
{
+ /* Work around ICC's desire to optimize denormal floats to 0. */
+ if (z > -FLT_MIN)
+ return L_(-1.0);
/* Avoid rounding errors for values near -2^k, where k >= MANT_DIG-1. */
if (z > - TWO_MANT_DIG)
{
return 0;
else
{
+#if GNULIB_TEST_FPRINTF_POSIX
fprintf (stderr, "floorf %g(%a) = %g(%a) or %g(%a)?\n",
x, x, reference, reference, result, result);
+#endif
return 1;
}
}