X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=inline;f=tests%2Ftest-printf-frexpl.c;h=c57d2f81aeeaedbcc0502d2d11dcf7b44569b699;hb=81f8f597ea553e8454b0bbd89b81b71bc2ce3568;hp=32c92e8f3055f5ca2dbef9a03151f19fa39f7bc0;hpb=f6183e64302b3af947cdd932049180b5a32f6443;p=gnulib.git

diff --git a/tests/test-printf-frexpl.c b/tests/test-printf-frexpl.c
index 32c92e8f3..c57d2f81a 100644
--- a/tests/test-printf-frexpl.c
+++ b/tests/test-printf-frexpl.c
@@ -24,8 +24,21 @@
 #include <float.h>
 #include <stdlib.h>
 
+#include "fpucw.h"
+
 #define ASSERT(expr) if (!(expr)) abort ();
 
+/* 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)
+# 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 +54,9 @@ 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 +65,14 @@ 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 +87,14 @@ 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 +111,14 @@ 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);