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authorUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
committerUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
commitabfbdde177c3a7155070dda1b2cdc8292054cc26 (patch)
treee021306b596381fbf8311d2b7eb294e918ff17c8 /sysdeps/i386/i686/fpu/s_fmax.S
parent86421aa57ecfd70963ae66848bd6a6dd3b8e0fe6 (diff)
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+/* Compute maximum of two numbers, regarding NaN as missing argument.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <sysdep.h>
+
+	.text
+ENTRY(__fmax)
+	fldl	4(%esp)		// x
+	fldl	12(%esp)	// x : y
+
+	fucomi	%st(0), %st
+	fcmovu	%st(1), %st	// now %st contains y if not NaN, x otherwise
+
+	fxch
+
+	fucomi	%st(1), %st
+	fcmovb	%st(1), %st
+
+	fstp	%st(1)
+
+	ret
+END(__fmax)
+weak_alias (__fmax, fmax)