ceilf-ieee: Work around bug on AIX 7.1.

* m4/ceilf.m4 (gl_FUNC_CEILF): Test also the sign of ceilf (-0.3f).
* doc/posix-functions/ceilf.texi: Mention the AIX 7.1 problem.

diff --git a/ChangeLog b/ChangeLog
index 1c0136a..6509252 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2011-06-19  Bruno Haible  <bruno@clisp.org>
 
+       ceilf-ieee: Work around bug on AIX 7.1.
+       * m4/ceilf.m4 (gl_FUNC_CEILF): Test also the sign of ceilf (-0.3f).
+       * doc/posix-functions/ceilf.texi: Mention the AIX 7.1 problem.
+
+2011-06-19  Bruno Haible  <bruno@clisp.org>
+
        ceil-ieee: Work around bug on AIX 7.1.
        * m4/ceil.m4 (gl_FUNC_CEIL): Test also the sign of ceil (-0.3).
        * doc/posix-functions/ceil.texi: Mention the AIX 7.1 problem.

diff --git a/doc/posix-functions/ceilf.texi b/doc/posix-functions/ceilf.texi
index cc85fc8..0cd6d87 100644 (file)
--- a/doc/posix-functions/ceilf.texi
+++ b/doc/posix-functions/ceilf.texi
@@ -16,6 +16,10 @@ AIX 5.1, HP-UX 11, Solaris 9.
 Portability problems fixed by Gnulib module @code{ceilf-ieee}:
 @itemize
 @item
+This function returns a positive zero for an argument between -1 and 0
+on some platforms:
+AIX 7.1.
+@item
 This function returns a positive zero for a minus zero argument
 on some platforms:
 OSF/1 5.1.

diff --git a/m4/ceilf.m4 b/m4/ceilf.m4
index 9161a51..66bac69 100644 (file)
--- a/m4/ceilf.m4
+++ b/m4/ceilf.m4
@@ -1,4 +1,4 @@
-# ceilf.m4 serial 9
+# ceilf.m4 serial 10
 dnl Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -37,10 +37,14 @@ AC_DEFUN([gl_FUNC_CEILF],
 ]gl_FLOAT_SIGNBIT_CODE[
 int main()
 {
+  int result = 0;
   /* Test whether ceilf (-0.0f) is -0.0f.  */
   if (signbitf (minus_zerof) && !signbitf (ceilf (minus_zerof)))
-    return 1;
-  return 0;
+    result |= 1;
+  /* Test whether ceilf (-0.3f) is -0.0f.  */
+  if (signbitf (-0.3f) && !signbitf (ceilf (-0.3f)))
+    result |= 2;
+  return result;
 }
               ]])],
               [gl_cv_func_ceilf_ieee=yes],