projects
/
gnulib.git
/ blobdiff
commit
grep
author
committer
pickaxe
?
search:
re
summary
|
shortlog
|
log
|
commit
|
commitdiff
|
tree
raw
|
inline
| side by side
utimens: simplify the logic of the previous change
[gnulib.git]
/
tests
/
test-trunc2.c
diff --git
a/tests/test-trunc2.c
b/tests/test-trunc2.c
index
397e1ad
..
748c045
100644
(file)
--- a/
tests/test-trunc2.c
+++ b/
tests/test-trunc2.c
@@
-16,6
+16,9
@@
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
/* 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 <config.h>
#include <math.h>
@@
-26,6
+29,7
@@
#include <stdio.h>
#include "isnand-nolibm.h"
#include <stdio.h>
#include "isnand-nolibm.h"
+#include "minus-zero.h"
#include "macros.h"
#include "macros.h"
@@
-35,6
+39,9
@@
#define MANT_DIG DBL_MANT_DIG
#define L_(literal) literal
#define MANT_DIG DBL_MANT_DIG
#define L_(literal) literal
+/* -0.0. See minus-zero.h. */
+#define MINUS_ZERO minus_zerod
+
/* 2^(MANT_DIG-1). */
static const DOUBLE TWO_MANT_DIG =
/* Assume MANT_DIG <= 5 * 31.
/* 2^(MANT_DIG-1). */
static const DOUBLE TWO_MANT_DIG =
/* Assume MANT_DIG <= 5 * 31.
@@
-60,8
+67,12
@@
trunc_reference (DOUBLE x)
if (z > L_(0.0))
{
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. */
/* 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;
{
/* Round to the next integer (nearest or up or down, doesn't matter). */
z += TWO_MANT_DIG;
@@
-73,8
+84,12
@@
trunc_reference (DOUBLE x)
}
else if (z < L_(0.0))
{
}
else if (z < L_(0.0))
{
+ /* For -1 < x < 0, return -0.0 regardless of the current rounding
+ mode. */
+ if (z > L_(-1.0))
+ z = MINUS_ZERO;
/* Avoid rounding errors for values near -2^k, where k >= MANT_DIG-1. */
/* 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;
{
/* Round to the next integer (nearest or up or down, doesn't matter). */
z -= TWO_MANT_DIG;
@@
-123,8
+138,10
@@
check (double x)
return 0;
else
{
return 0;
else
{
+#if GNULIB_TEST_FPRINTF_POSIX
fprintf (stderr, "trunc %g(%a) = %g(%a) or %g(%a)?\n",
x, x, reference, reference, result, result);
fprintf (stderr, "trunc %g(%a) = %g(%a) or %g(%a)?\n",
x, x, reference, reference, result, result);
+#endif
return 1;
}
}
return 1;
}
}