Home | History | Annotate | Line # | Download | only in gen
fixunsdfsi.S revision 1.1 
      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 
     37 #include "SYS.h"
     38 
     39 #if defined(LIBC_SCCS) && !defined(lint)
     40 	.text
     41 	/*.asciz "from: @(#)fixunsdfsi.s	5.1	12/17/90"*/
     42 	.asciz "$Id: fixunsdfsi.S,v 1.1 1993/10/07 00:19:03 cgd Exp $"
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 	.globl ___fixunsdfsi
     46 ___fixunsdfsi:
     47 	fldl	4(%esp)		/* argument double to accum stack */
     48 	frndint			/* create integer */
     49 #ifdef PIC
     50 	PIC_PROLOGUE
     51 	leal	PIC_GOTOFF(fbiggestsigned),%eax
     52 	PIC_EPILOGUE
     53 	fcoml	(%eax)
     54 #else
     55 	fcoml	PIC_GOTOFF(fbiggestsigned)	/* bigger than biggest signed? */
     56 #endif
     57 	fstsw	%ax
     58 	sahf
     59 	jnb	1f
     60 
     61 	fistpl	4(%esp)
     62 	movl	4(%esp),%eax
     63 	ret
     64 
     65 1:
     66 #ifdef PIC
     67 	PIC_PROLOGUE
     68 	leal	PIC_GOTOFF(fbiggestsigned),%eax
     69 	PIC_EPILOGUE
     70 	fsubl	(%eax)
     71 #else
     72 	fsubl	PIC_GOTOFF(fbiggestsigned)	/* reduce for proper conversion */
     73 #endif
     74 	fistpl	4(%esp)		/* convert */
     75 	movl	4(%esp),%eax
     76 	orl	$0x80000000,%eax	/* restore bias */
     77 	PIC_EPILOGUE
     78 	ret
     79 
     80 fbiggestsigned:	.double	0r2147483648.0
     81