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authorUlrich Drepper <drepper@redhat.com>2009-08-25 14:54:12 -0700
committerUlrich Drepper <drepper@redhat.com>2009-08-25 14:54:12 -0700
commit7423a3456a83c0449b4a545779fc15e75b315a2c (patch)
tree5eea93a8bf5ec19b01877df01ea04c35c38d6e90 /sysdeps/x86_64/fpu/s_signbit.S
parentd5cb714bb8c5fb116ac73c46890026c8beea92fe (diff)
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Optimized signbit{,f} for x86-64.
Diffstat (limited to 'sysdeps/x86_64/fpu/s_signbit.S')
-rw-r--r--sysdeps/x86_64/fpu/s_signbit.S27
1 files changed, 27 insertions, 0 deletions
diff --git a/sysdeps/x86_64/fpu/s_signbit.S b/sysdeps/x86_64/fpu/s_signbit.S
new file mode 100644
index 0000000000..0bfd62e30d
--- /dev/null
+++ b/sysdeps/x86_64/fpu/s_signbit.S
@@ -0,0 +1,27 @@
+/* Return nonzero value if number is negative.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redha.com>, 2009.
+
+   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 <sysdep.h>
+
+ENTRY(__signbit)
+	pmovmskb %xmm0, %eax
+	andl	$0x80, %eax
+	ret
+END(__signbit)