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fixunsdfsi.S revision 1.5.62.1 
      1  1.5.62.1       tls /*	$NetBSD: fixunsdfsi.S,v 1.5.62.1 2014/08/20 00:02:12 tls Exp $	*/
      2       1.4  christos 
      3       1.1       cgd /*
      4       1.1       cgd  * Copyright (c) 1992, 1993
      5       1.1       cgd  *	The Regents of the University of California.  All rights reserved.
      6       1.1       cgd  *
      7       1.1       cgd  * This software was developed by the Computer Systems Engineering group
      8       1.1       cgd  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9       1.1       cgd  * contributed to Berkeley.
     10       1.1       cgd  *
     11       1.1       cgd  * Redistribution and use in source and binary forms, with or without
     12       1.1       cgd  * modification, are permitted provided that the following conditions
     13       1.1       cgd  * are met:
     14       1.1       cgd  * 1. Redistributions of source code must retain the above copyright
     15       1.1       cgd  *    notice, this list of conditions and the following disclaimer.
     16       1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
     17       1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
     18       1.1       cgd  *    documentation and/or other materials provided with the distribution.
     19       1.5       agc  * 3. Neither the name of the University nor the names of its contributors
     20       1.1       cgd  *    may be used to endorse or promote products derived from this software
     21       1.1       cgd  *    without specific prior written permission.
     22       1.1       cgd  *
     23       1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24       1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25       1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26       1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27       1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28       1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29       1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30       1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31       1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32       1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33       1.1       cgd  * SUCH DAMAGE.
     34       1.1       cgd  *
     35       1.1       cgd  * from: Header: fixunsdfsi.s,v 1.3 91/10/08 00:03:15 torek Exp
     36       1.1       cgd  */
     37       1.1       cgd 
     38       1.4  christos #include <machine/asm.h>
     39       1.1       cgd #if defined(LIBC_SCCS) && !defined(lint)
     40       1.4  christos #if 0
     41       1.1       cgd 	.asciz "@(#)fixunsdfsi.s	8.1 (Berkeley) 6/4/93"
     42       1.4  christos #else
     43  1.5.62.1       tls 	RCSID("$NetBSD: fixunsdfsi.S,v 1.5.62.1 2014/08/20 00:02:12 tls Exp $")
     44       1.4  christos #endif
     45       1.1       cgd #endif /* LIBC_SCCS and not lint */
     46       1.1       cgd 
     47       1.1       cgd /*
     48       1.1       cgd  * Convert double to unsigned integer (for gcc).
     49       1.1       cgd  *
     50       1.1       cgd  * I have made the output for NaN agree with the Sun compiler, not
     51       1.1       cgd  * that it really matters, by using `fbul,a'.
     52       1.1       cgd  */
     53       1.1       cgd 
     54       1.1       cgd 
     55       1.1       cgd 	.align	8
     56       1.1       cgd Lbig:
     57       1.1       cgd 	.word	0x41e00000		! .double 0r2147483648.0e+00
     58       1.1       cgd 	.word	0			! (who me, not trust the assembler?)
     59       1.1       cgd 
     60       1.1       cgd ENTRY(__fixunsdfsi)
     61       1.1       cgd 	sub	%sp, 8, %sp
     62       1.1       cgd 	std	%o0, [%sp + 64]		! get argument into fpu reg
     63       1.1       cgd 	ldd	[%sp + 64], %f0
     64  1.5.62.1       tls #ifdef __PIC__
     65       1.2        pk 	PICCY_SET(Lbig, %g1, %o0)
     66       1.2        pk 	ldd	[%g1], %f2
     67       1.2        pk #else
     68       1.1       cgd 	sethi	%hi(Lbig), %g1
     69       1.1       cgd 	ldd	[%g1 + %lo(Lbig)], %f2
     70       1.2        pk #endif
     71       1.1       cgd 	fcmped	%f0, %f2		! d < 2^31, or NaN, or -Inf?
     72       1.1       cgd 	nop				! (fpop2 delay)
     73       1.1       cgd 	fbul,a	1f			! if so, use fdtoi to convert to int
     74       1.1       cgd 	fdtoi	%f0, %f0		!        (this includes negatives!)
     75       1.1       cgd 
     76       1.1       cgd 	! d does not fit in an int, so subtract 2^31, convert,
     77       1.1       cgd 	! and add 2^31 again (sigh).  Just hope the intermediate
     78       1.1       cgd 	! fits (if not, the result is undefined anyway).
     79       1.1       cgd 
     80       1.1       cgd 	fsubd	%f0, %f2, %f0		! d -= 2^31
     81       1.1       cgd 	fdtoi	%f0, %f0		! convert to int
     82       1.1       cgd 	st	%f0, [%sp + 64]		! move into return reg
     83       1.1       cgd 	ld	[%sp + 64], %o0
     84       1.1       cgd 	sethi	%hi(0x80000000), %o1
     85       1.1       cgd 	add	%o0, %o1, %o0		! add 2^31
     86       1.1       cgd 	retl
     87       1.1       cgd 	add	%sp, 8, %sp
     88       1.1       cgd 
     89       1.1       cgd 1:
     90       1.1       cgd 	st	%f0, [%sp + 64]		! return result
     91       1.1       cgd 	ld	[%sp + 64], %o0
     92       1.1       cgd 	retl
     93       1.1       cgd 	add	%sp, 8, %sp
     94