GNU C Library master sources branch, master, updated. glibc-2.14-252-g3d4837d

[drepper at sourceware dot org]

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http://sources.redhat.com/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=3d4837df4ab1a826871e31822694e137779fd7d0

commit 3d4837df4ab1a826871e31822694e137779fd7d0
Author: Ulrich Drepper <drepper@gmail.com>
Date:   Wed Sep 7 22:17:33 2011 -0400

    Check for finite/infinity parms in IBM Long Double 128 fmal( )
    
    This patch addresses some IBM Long Double 128 fmal () test-ldouble.out
    and test-ildoubl.out failures.  If the â??xâ?? and â??yâ?? parameters are
    finite values and â??zâ?? is infinity, the result of fmal () should be â??zâ??
    not NaN.
    
    Conflicts:
    
    	ChangeLog

diff --git a/ChangeLog b/ChangeLog
index 57d3be9..ad81f74 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -23,6 +23,11 @@
 	* sysdeps/powerpc/powerpc32/ppc-mcount.S (_mcount): Call
 	__mcount_internal with usual JUMPTARGET.  Remove useless nop.
 
+2011-08-18  David Flaherty  <flaherty@linux.vnet.ibm.com>
+
+	* sysdeps/ieee754/ldbl-128ibm/s_fmal.c: New file which checks
+	for finite and infinity parameters.
+
 2011-08-04  Will Schmidt  <will_schmidt@vnet.ibm.com>
 
 	* sysdeps/powerpc/powerpc32/power7/strncmp.S: Adjust the alignment
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_fmal.c b/sysdeps/ieee754/ldbl-128ibm/s_fmal.c
new file mode 100644
index 0000000..e59d2c3
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-128ibm/s_fmal.c
@@ -0,0 +1,39 @@
+/* Compute x * y + z as ternary operation.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by David Flaherty <flaherty@linux.vnet.ibm.com>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <math.h>
+#include <math_ldbl_opt.h>
+
+long double
+__fmal (long double x, long double y, long double z)
+{
+	/* An IBM long double 128 is really just 2 IEEE64 doubles, and in
+	 * the case of inf/nan only the first double counts. So we use the
+	 * (double) cast to avoid any data movement.   */
+       if ((finite ((double)x) && finite ((double)y)) && isinf ((double)z))
+               return (z);
+
+       return (x * y) + z;
+}
+#ifdef IS_IN_libm
+long_double_symbol (libm, __fmal, fmal);
+#else
+long_double_symbol (libc, __fmal, fmal);
+#endif

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                                      |    5 +++++
 {math => sysdeps/ieee754/ldbl-128ibm}/s_fmal.c |   19 +++++++++++++++----
 2 files changed, 20 insertions(+), 4 deletions(-)
 copy {math => sysdeps/ieee754/ldbl-128ibm}/s_fmal.c (61%)


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