2007-08-06 Simon Josefsson <simon@josefsson.org>

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

diff --git a/tests/test-printf-frexpl.c b/tests/test-printf-frexpl.c
index 32c92e8..2c1b1eb 100644 (file)
--- a/tests/test-printf-frexpl.c
+++ b/tests/test-printf-frexpl.c
@@ -22,9 +22,37 @@
 #include "printf-frexpl.h"
 
 #include <float.h>
+#include <stdio.h>
 #include <stdlib.h>
 
-#define ASSERT(expr) if (!(expr)) abort ();
+#include "fpucw.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.  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)
+# define MIN_SUBNORMAL_EXP MIN_NORMAL_EXP
+#elif defined __ppc || defined __ppc__ || defined __powerpc || defined __powerpc__
+# define MIN_NORMAL_EXP (LDBL_MIN_EXP + 53)
+# define MIN_SUBNORMAL_EXP MIN_NORMAL_EXP
+#else
+# define MIN_NORMAL_EXP LDBL_MIN_EXP
+# define MIN_SUBNORMAL_EXP (LDBL_MIN_EXP - 100)
+#endif
 
 static long double
 my_ldexp (long double x, int d)
@@ -41,6 +69,9 @@ main ()
 {
   int i;
   long double x;
+  DECL_LONG_DOUBLE_ROUNDING
+
+  BEGIN_LONG_DOUBLE_ROUNDING ();
 
   for (i = 1, x = 1.0L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
     {
@@ -49,14 +80,14 @@ main ()
       ASSERT (exp == i - 1);
       ASSERT (mantissa == 1.0L);
     }
-  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 = printf_frexpl (x, &exp);
       ASSERT (exp == i - 1);
       ASSERT (mantissa == 1.0L);
     }
-  for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
+  for (; i >= MIN_SUBNORMAL_EXP && x > 0.0L; i--, x *= 0.5L)
     {
       int exp = -9999;
       long double mantissa = printf_frexpl (x, &exp);
@@ -71,14 +102,14 @@ main ()
       ASSERT (exp == i - 1);
       ASSERT (mantissa == 1.01L);
     }
-  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 = printf_frexpl (x, &exp);
       ASSERT (exp == i - 1);
       ASSERT (mantissa == 1.01L);
     }
-  for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
+  for (; i >= MIN_SUBNORMAL_EXP && x > 0.0L; i--, x *= 0.5L)
     {
       int exp = -9999;
       long double mantissa = printf_frexpl (x, &exp);
@@ -95,14 +126,14 @@ main ()
       ASSERT (exp == i - 1);
       ASSERT (mantissa == 1.73205L);
     }
-  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 = printf_frexpl (x, &exp);
       ASSERT (exp == i - 1);
       ASSERT (mantissa == 1.73205L);
     }
-  for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
+  for (; i >= MIN_SUBNORMAL_EXP && x > 0.0L; i--, x *= 0.5L)
     {
       int exp = -9999;
       long double mantissa = printf_frexpl (x, &exp);