test-linkat: avoid failed assertion on "other" architectures

[gnulib.git] / tests / test-frexpl.c

diff --git a/tests/test-frexpl.c b/tests/test-frexpl.c
index fd2c7e0..8d9d41d 100644 (file)
--- 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) 2007-2010 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 <http://www.gnu.org/licenses/>.  */
 
 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
 
@@ -21,23 +20,50 @@
 
 #include <math.h>
 
+#include "signature.h"
+SIGNATURE_CHECK (frexpl, long double, (long double, int *));
+
 #include <float.h>
-#include <stdlib.h>
 
 #include "fpucw.h"
 #include "isnanl-nolibm.h"
+#include "nan.h"
+#include "macros.h"
 
-#define ASSERT(expr) if (!(expr)) abort ();
+/* Avoid some warnings from "gcc -Wshadow".
+   This file doesn't use the exp() function.  */
+#undef exp
+#define exp exponent
 
 /* On MIPS IRIX machines, LDBL_MIN_EXP is -1021, but the smallest reliable
-   exponent for 'long double' is -964.  For exponents below that, the
-   precision may be truncated to the precision used for 'double'.  */
+   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)
 {
@@ -60,7 +86,7 @@ main ()
   { /* NaN.  */
     int exp = -9999;
     long double mantissa;
-    x = 0.0L / 0.0L;
+    x = NaNl ();
     mantissa = frexpl (x, &exp);
     ASSERT (isnanl (mantissa));
   }
@@ -94,7 +120,7 @@ main ()
   { /* Negative zero.  */
     int exp = -9999;
     long double mantissa;
-    x = -0.0L;
+    x = minus_zero;
     mantissa = frexpl (x, &exp);
     ASSERT (exp == 0);
     ASSERT (mantissa == x);