/* Test of rounding to nearest, breaking ties away from zero.
- Copyright (C) 2007 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 Ben Pfaff <blp@gnu.org>, 2007.
Heavily based on code by Bruno Haible. */
+/* When this test fails on some platform, build it together with the gnulib
+ module 'fprintf-posix' for optimal debugging output. */
+
/* Get the two reference implementations of round under the names
round_reference1 and round_reference2.
-
+
round.c will #include <config.h> for us. */
#define FLOOR_BASED_ROUND round_reference1
#define FLOOR_FREE_ROUND round_reference2
#ifdef USE_LONG_DOUBLE
# error Long double not supported.
#elif ! defined USE_FLOAT
-# include "isnan.h"
-# define ISNAN isnan
+# include "isnand-nolibm.h"
+# define ISNAN isnand
# define FUNCTION "round"
# define DOUBLE_UINT uint64_t
# define DOUBLE_BITS 64
# define NUM_HIGHBITS 13
# define NUM_LOWBITS 4
#else /* defined USE_FLOAT */
-# include "isnanf.h"
+# include "isnanf-nolibm.h"
# define ISNAN isnanf
# define FUNCTION "roundf"
# define DOUBLE_UINT uint32_t
{
if (ISNAN (y0) ? ISNAN (y1) : y0 == y1)
return true;
- else
+ else
{
+#if GNULIB_TEST_FPRINTF_POSIX
fprintf (stderr, "%s: "FUNCTION"(%g(%a)) = %g(%a) or %g(%a)?\n",
- message, x, x, y0, y0, y1, y1);
+ message, x, x, y0, y0, y1, y1);
+#endif
return false;
}
}
{
DOUBLE ref1 = round_reference1 (x);
DOUBLE ref2 = round_reference2 (x);
- DOUBLE result = round (x);
-
+ DOUBLE result = ROUND (x);
+
/* If the reference implementations disagree, bail out immediately. */
- if (!equal ("reference implementations disagree", x, ref1, ref2))
+ if (!equal ("reference implementations disagree", x, ref1, ref2))
exit (EXIT_FAILURE);
/* If the actual implementation is wrong, return an error code. */
for (highbits = 0; highbits < (1 << NUM_HIGHBITS); highbits++)
for (lowbits = 0; lowbits < (1 << NUM_LOWBITS); lowbits++)
{
- /* Combine highbits and lowbits into a floating-point number,
- sign-extending the lowbits to DOUBLE_BITS-NUM_HIGHBITS bits. */
- union { DOUBLE f; DOUBLE_UINT i; } janus;
- verify (sizeof janus.f == sizeof janus.i);
- janus.i = lowbits | (highbits << (DOUBLE_BITS - NUM_HIGHBITS));
- if (lowbits >> (NUM_LOWBITS - 1))
- janus.i |= ((DOUBLE_UINT) -1
- >> (NUM_LOWBITS + NUM_HIGHBITS)
- << NUM_LOWBITS);
- if (!check (janus.f))
- error = true;
+ /* Combine highbits and lowbits into a floating-point number,
+ sign-extending the lowbits to DOUBLE_BITS-NUM_HIGHBITS bits. */
+ union { DOUBLE f; DOUBLE_UINT i; } janus;
+ verify (sizeof janus.f == sizeof janus.i);
+ janus.i = lowbits | (highbits << (DOUBLE_BITS - NUM_HIGHBITS));
+ if (lowbits >> (NUM_LOWBITS - 1))
+ janus.i |= ((DOUBLE_UINT) -1
+ >> (NUM_LOWBITS + NUM_HIGHBITS)
+ << NUM_LOWBITS);
+ if (!check (janus.f))
+ error = true;
}
return (error ? 1 : 0);
}