X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=tests%2Ftest-frexpl.c;h=d4babb88c3c80378a57fbb281819f447f77c1632;hb=b6dfa79ff86b50398ad397c4c43954d005866ce9;hp=f98fcf109db3d1fd12d98aa9a569dd0cd7e8139c;hpb=80689324582ff25f245c1ff52a401a59072c1928;p=gnulib.git
diff --git a/tests/test-frexpl.c b/tests/test-frexpl.c
index f98fcf109..d4babb88c 100644
--- a/tests/test-frexpl.c
+++ b/tests/test-frexpl.c
@@ -1,10 +1,10 @@
/* Test of splitting a 'long double' into fraction and mantissa.
- Copyright (C) 2007 Free Software Foundation, Inc.
+ Copyright (C) 2007-2009 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -12,8 +12,7 @@
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see . */
/* Written by Bruno Haible , 2007. */
@@ -22,9 +21,58 @@
#include
#include
+#include
#include
-#define ASSERT(expr) if (!(expr)) abort ();
+#include "fpucw.h"
+#include "isnanl-nolibm.h"
+#include "nan.h"
+
+/* Avoid some warnings from "gcc -Wshadow".
+ This file doesn't use the exp() function. */
+#undef exp
+#define exp exponent
+
+#define ASSERT(expr) \
+ do \
+ { \
+ if (!(expr)) \
+ { \
+ fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+ fflush (stderr); \
+ abort (); \
+ } \
+ } \
+ while (0)
+
+/* On MIPS IRIX machines, LDBL_MIN_EXP is -1021, but the smallest reliable
+ exponent for 'long double' is -964. Similarly, on PowerPC machines,
+ LDBL_MIN_EXP is -1021, but the smallest reliable exponent for 'long double'
+ is -968. For exponents below that, the precision may be truncated to the
+ precision used for 'double'. */
+#ifdef __sgi
+# define MIN_NORMAL_EXP (LDBL_MIN_EXP + 57)
+#elif defined __ppc || defined __ppc__ || defined __powerpc || defined __powerpc__
+# define MIN_NORMAL_EXP (LDBL_MIN_EXP + 53)
+#else
+# define MIN_NORMAL_EXP LDBL_MIN_EXP
+#endif
+
+/* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
+ So we use minus_zero instead.
+ IRIX cc can't put -0.0L into .data, but can compute at runtime.
+ Note that the expression -LDBL_MIN * LDBL_MIN does not work on other
+ platforms, such as when cross-compiling to PowerPC on MacOS X 10.5. */
+#if defined __hpux || defined __sgi
+static long double
+compute_minus_zero (void)
+{
+ return -LDBL_MIN * LDBL_MIN;
+}
+# define minus_zero compute_minus_zero ()
+#else
+long double minus_zero = -0.0L;
+#endif
static long double
my_ldexp (long double x, int d)
@@ -41,13 +89,16 @@ main ()
{
int i;
long double x;
+ DECL_LONG_DOUBLE_ROUNDING
+
+ BEGIN_LONG_DOUBLE_ROUNDING ();
{ /* NaN. */
int exp = -9999;
long double mantissa;
- x = 0.0L / 0.0L;
+ x = NaNl ();
mantissa = frexpl (x, &exp);
- ASSERT (mantissa != mantissa);
+ ASSERT (isnanl (mantissa));
}
{ /* Positive infinity. */
@@ -73,15 +124,17 @@ main ()
mantissa = frexpl (x, &exp);
ASSERT (exp == 0);
ASSERT (mantissa == x);
+ ASSERT (!signbit (mantissa));
}
{ /* Negative zero. */
int exp = -9999;
long double mantissa;
- x = -0.0L;
+ x = minus_zero;
mantissa = frexpl (x, &exp);
ASSERT (exp == 0);
ASSERT (mantissa == x);
+ ASSERT (signbit (mantissa));
}
for (i = 1, x = 1.0L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
@@ -91,7 +144,7 @@ main ()
ASSERT (exp == i);
ASSERT (mantissa == 0.5L);
}
- for (i = 1, x = 1.0L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+ for (i = 1, x = 1.0L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = frexpl (x, &exp);
@@ -113,7 +166,7 @@ main ()
ASSERT (exp == i);
ASSERT (mantissa == -0.5L);
}
- for (i = 1, x = -1.0L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+ for (i = 1, x = -1.0L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = frexpl (x, &exp);
@@ -135,7 +188,7 @@ main ()
ASSERT (exp == i);
ASSERT (mantissa == 0.505L);
}
- for (i = 1, x = 1.01L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+ for (i = 1, x = 1.01L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = frexpl (x, &exp);
@@ -159,7 +212,7 @@ main ()
ASSERT (exp == i);
ASSERT (mantissa == 0.866025L);
}
- for (i = 1, x = 1.73205L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+ for (i = 1, x = 1.73205L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = frexpl (x, &exp);