s_floor.S revision 1.1 
11.1Sjtc/*
21.1Sjtc * Copyright (c) 1993,94 Winning Strategies, Inc.
31.1Sjtc * All rights reserved.
41.1Sjtc *
51.1Sjtc * Redistribution and use in source and binary forms, with or without
61.1Sjtc * modification, are permitted provided that the following conditions
71.1Sjtc * are met:
81.1Sjtc * 1. Redistributions of source code must retain the above copyright
91.1Sjtc *    notice, this list of conditions and the following disclaimer.
101.1Sjtc * 2. Redistributions in binary form must reproduce the above copyright
111.1Sjtc *    notice, this list of conditions and the following disclaimer in the
121.1Sjtc *    documentation and/or other materials provided with the distribution.
131.1Sjtc * 3. All advertising materials mentioning features or use of this software
141.1Sjtc *    must display the following acknowledgement:
151.1Sjtc *      This product includes software developed by Winning Strategies, Inc.
161.1Sjtc * 4. The name of the author may not be used to endorse or promote products
171.1Sjtc *    derived from this software without specific prior written permission.
181.1Sjtc *
191.1Sjtc * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
201.1Sjtc * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
211.1Sjtc * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
221.1Sjtc * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
231.1Sjtc * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
241.1Sjtc * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
251.1Sjtc * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
261.1Sjtc * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
271.1Sjtc * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
281.1Sjtc * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
291.1Sjtc */
301.1Sjtc
311.1Sjtc/*
321.1Sjtc * Written by:
331.1Sjtc *	J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
341.1Sjtc */
351.1Sjtc
361.1Sjtc#include <machine/asm.h>
371.1Sjtc
381.1SjtcENTRY(floor)
391.1Sjtc	pushl	%ebp
401.1Sjtc	movl	%esp,%ebp
411.1Sjtc	subl	$8,%esp
421.1Sjtc
431.1Sjtc	fstcw	-12(%ebp)		/* store fpu control word */
441.1Sjtc	movw	-12(%ebp),%dx
451.1Sjtc	orw	$0x0400,%dx		/* round towards -oo */
461.1Sjtc	andw	$0xf7ff,%dx
471.1Sjtc	movw	%dx,-16(%ebp)
481.1Sjtc	fldcw	-16(%ebp)		/* load modfied control word */
491.1Sjtc
501.1Sjtc	fldl	8(%ebp);		/* round */
511.1Sjtc	frndint
521.1Sjtc
531.1Sjtc	fldcw	-12(%ebp)		/* restore original control word */
541.1Sjtc
551.1Sjtc	leave
561.1Sjtc	ret
57