X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-frexpl.c;h=93cfa14434f37ae2c0b386ec908c13e896d57ebb;hb=70f2c04b76c463b54adb0c1db6de2b2c5c40661c;hp=f98fcf109db3d1fd12d98aa9a569dd0cd7e8139c;hpb=80689324582ff25f245c1ff52a401a59072c1928;p=gnulib.git

diff --git a/tests/test-frexpl.c b/tests/test-frexpl.c
index f98fcf109..93cfa1443 100644
--- a/tests/test-frexpl.c
+++ b/tests/test-frexpl.c
@@ -22,9 +22,31 @@
 #include <math.h>
 
 #include <float.h>
+#include <stdio.h>
 #include <stdlib.h>
 
-#define ASSERT(expr) if (!(expr)) abort ();
+#include "fpucw.h"
+#include "isnanl-nolibm.h"
+
+#define ASSERT(expr) \
+  do									     \
+    {									     \
+      if (!(expr))							     \
+        {								     \
+          fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+          abort ();							     \
+        }								     \
+    }									     \
+  while (0)
+
+/* 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'.  */
+#ifdef __sgi
+# define MIN_NORMAL_EXP (LDBL_MIN_EXP + 57)
+#else
+# define MIN_NORMAL_EXP LDBL_MIN_EXP
+#endif
 
 static long double
 my_ldexp (long double x, int d)
@@ -41,13 +63,16 @@ 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;
     mantissa = frexpl (x, &exp);
-    ASSERT (mantissa != mantissa);
+    ASSERT (isnanl (mantissa));
   }
 
   { /* Positive infinity.  */
@@ -73,6 +98,7 @@ main ()
     mantissa = frexpl (x, &exp);
     ASSERT (exp == 0);
     ASSERT (mantissa == x);
+    ASSERT (!signbit (mantissa));
   }
 
   { /* Negative zero.  */
@@ -82,6 +108,7 @@ main ()
     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 +118,7 @@ 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 +140,7 @@ 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 +162,7 @@ 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 +186,7 @@ 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);