X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-ceilf2.c;h=b8aa4792c5d99d2abd99237d5303113ad1ba96d8;hb=00c36a3c1f4c4499f52684083b07dbee385881ea;hp=a7c4b5e3189fae707f6f9186c1502f1b25af27b7;hpb=987e5651e8d1c5aa933c9ce88562806af4093702;p=gnulib.git

diff --git a/tests/test-ceilf2.c b/tests/test-ceilf2.c
index a7c4b5e31..b8aa4792c 100644
--- a/tests/test-ceilf2.c
+++ b/tests/test-ceilf2.c
@@ -1,5 +1,5 @@
 /* Test of rounding towards positive infinity.
-   Copyright (C) 2007-2009 Free Software Foundation, Inc.
+   Copyright (C) 2007-2011 Free Software Foundation, Inc.
 
    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
@@ -16,6 +16,9 @@
 
 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
 
+/* When this test fails on some platform, build it together with the gnulib
+   module 'fprintf-posix' for optimal debugging output.  */
+
 #include <config.h>
 
 #include <math.h>
@@ -26,6 +29,7 @@
 #include <stdio.h>
 
 #include "isnanf-nolibm.h"
+#include "minus-zero.h"
 #include "macros.h"
 
 
@@ -35,6 +39,9 @@
 #define MANT_DIG FLT_MANT_DIG
 #define L_(literal) literal##f
 
+/* -0.0.  See minus-zero.h.  */
+#define MINUS_ZERO minus_zerof
+
 /* 2^(MANT_DIG-1).  */
 static const DOUBLE TWO_MANT_DIG =
   /* Assume MANT_DIG <= 5 * 31.
@@ -60,6 +67,9 @@ ceilf_reference (DOUBLE x)
 
   if (z > L_(0.0))
     {
+      /* Work around ICC's desire to optimize denormal floats to 0.  */
+      if (z < FLT_MIN)
+        return L_(1.0);
       /* Avoid rounding errors for values near 2^k, where k >= MANT_DIG-1.  */
       if (z < TWO_MANT_DIG)
         {
@@ -73,8 +83,12 @@ ceilf_reference (DOUBLE x)
     }
   else if (z < L_(0.0))
     {
+      /* For -1 < x < 0, return -0.0 regardless of the current rounding
+         mode.  */
+      if (z > L_(-1.0))
+        z = MINUS_ZERO;
       /* Avoid rounding errors for values near -2^k, where k >= MANT_DIG-1.  */
-      if (z > - TWO_MANT_DIG)
+      else if (z > - TWO_MANT_DIG)
         {
           /* Round to the next integer (nearest or up or down, doesn't matter).  */
           z -= TWO_MANT_DIG;
@@ -119,8 +133,10 @@ check (float x)
       return 0;
     else
       {
+#if GNULIB_TEST_FPRINTF_POSIX
         fprintf (stderr, "ceilf %g(%a) = %g(%a) or %g(%a)?\n",
                  x, x, reference, reference, result, result);
+#endif
         return 1;
       }
   }