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fixunsdfsi.S revision 1.4 
      1 /*-
      2  * Copyright (c) 1990 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * William Jolitz.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  *	from: @(#)fixunsdfsi.s	5.1	12/17/90
     37  *	$Id: fixunsdfsi.S,v 1.4 1993/10/21 02:03:39 jtc Exp $
     38  */
     39 
     40 #if defined(LIBC_SCCS)
     41 	.text
     42 	.asciz "$Id: fixunsdfsi.S,v 1.4 1993/10/21 02:03:39 jtc Exp $"
     43 #endif
     44 
     45 #include "DEFS.h"
     46 #include "SYS.h"
     47 
     48 ENTRY(__fixunsdfsi)
     49 	fldl	4(%esp)		/* argument double to accum stack */
     50 	frndint			/* create integer */
     51 #ifdef PIC
     52 	PIC_PROLOGUE
     53 	leal	PIC_GOTOFF(fbiggestsigned),%eax
     54 	PIC_EPILOGUE
     55 	fcoml	(%eax)
     56 #else
     57 	fcoml	PIC_GOTOFF(fbiggestsigned)	/* bigger than biggest signed? */
     58 #endif
     59 	fstsw	%ax
     60 	sahf
     61 	jnb	1f
     62 
     63 	fistpl	4(%esp)
     64 	movl	4(%esp),%eax
     65 	ret
     66 
     67 1:
     68 #ifdef PIC
     69 	PIC_PROLOGUE
     70 	leal	PIC_GOTOFF(fbiggestsigned),%eax
     71 	PIC_EPILOGUE
     72 	fsubl	(%eax)
     73 #else
     74 	fsubl	PIC_GOTOFF(fbiggestsigned)	/* reduce for proper conversion */
     75 #endif
     76 	fistpl	4(%esp)		/* convert */
     77 	movl	4(%esp),%eax
     78 	orl	$0x80000000,%eax	/* restore bias */
     79 	PIC_EPILOGUE
     80 	ret
     81 
     82 fbiggestsigned:	.double	0r2147483648.0
     83