sparc/gen/fixunsdfsi.S

1.6     joerg /*	$NetBSD: fixunsdfsi.S,v 1.6 2013/09/12 15:36:16 joerg Exp $	*/
1.4  christos
1.1       cgd /*
1.1       cgd  * Copyright (c) 1992, 1993
1.1       cgd  *	The Regents of the University of California.  All rights reserved.
1.1       cgd  *
1.1       cgd  * This software was developed by the Computer Systems Engineering group
1.1       cgd  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
1.1       cgd  * contributed to Berkeley.
1.1       cgd  *
1.1       cgd  * Redistribution and use in source and binary forms, with or without
1.1       cgd  * modification, are permitted provided that the following conditions
1.1       cgd  * are met:
1.1       cgd  * 1. Redistributions of source code must retain the above copyright
1.1       cgd  *    notice, this list of conditions and the following disclaimer.
1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
1.1       cgd  *    documentation and/or other materials provided with the distribution.
1.5       agc  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd  *    may be used to endorse or promote products derived from this software
1.1       cgd  *    without specific prior written permission.
1.1       cgd  *
1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1.1       cgd  * SUCH DAMAGE.
1.1       cgd  *
1.1       cgd  * from: Header: fixunsdfsi.s,v 1.3 91/10/08 00:03:15 torek Exp
1.1       cgd  */
1.1       cgd
1.4  christos #include <machine/asm.h>
1.1       cgd #if defined(LIBC_SCCS) && !defined(lint)
1.4  christos #if 0
1.1       cgd 	.asciz "@(#)fixunsdfsi.s	8.1 (Berkeley) 6/4/93"
1.4  christos #else
1.6     joerg 	RCSID("$NetBSD: fixunsdfsi.S,v 1.6 2013/09/12 15:36:16 joerg Exp $")
1.4  christos #endif
1.1       cgd #endif /* LIBC_SCCS and not lint */
1.1       cgd
1.1       cgd /*
1.1       cgd  * Convert double to unsigned integer (for gcc).
1.1       cgd  *
1.1       cgd  * I have made the output for NaN agree with the Sun compiler, not
1.1       cgd  * that it really matters, by using `fbul,a'.
1.1       cgd  */
1.1       cgd
1.1       cgd
1.1       cgd 	.align	8
1.1       cgd Lbig:
1.1       cgd 	.word	0x41e00000		! .double 0r2147483648.0e+00
1.1       cgd 	.word	0			! (who me, not trust the assembler?)
1.1       cgd
1.1       cgd ENTRY(__fixunsdfsi)
1.1       cgd 	sub	%sp, 8, %sp
1.1       cgd 	std	%o0, [%sp + 64]		! get argument into fpu reg
1.1       cgd 	ldd	[%sp + 64], %f0
1.6     joerg #ifdef __PIC__
1.2        pk 	PICCY_SET(Lbig, %g1, %o0)
1.2        pk 	ldd	[%g1], %f2
1.2        pk #else
1.1       cgd 	sethi	%hi(Lbig), %g1
1.1       cgd 	ldd	[%g1 + %lo(Lbig)], %f2
1.2        pk #endif
1.1       cgd 	fcmped	%f0, %f2		! d < 2^31, or NaN, or -Inf?
1.1       cgd 	nop				! (fpop2 delay)
1.1       cgd 	fbul,a	1f			! if so, use fdtoi to convert to int
1.1       cgd 	fdtoi	%f0, %f0		!        (this includes negatives!)
1.1       cgd
1.1       cgd 	! d does not fit in an int, so subtract 2^31, convert,
1.1       cgd 	! and add 2^31 again (sigh).  Just hope the intermediate
1.1       cgd 	! fits (if not, the result is undefined anyway).
1.1       cgd
1.1       cgd 	fsubd	%f0, %f2, %f0		! d -= 2^31
1.1       cgd 	fdtoi	%f0, %f0		! convert to int
1.1       cgd 	st	%f0, [%sp + 64]		! move into return reg
1.1       cgd 	ld	[%sp + 64], %o0
1.1       cgd 	sethi	%hi(0x80000000), %o1
1.1       cgd 	add	%o0, %o1, %o0		! add 2^31
1.1       cgd 	retl
1.1       cgd 	add	%sp, 8, %sp
1.1       cgd
1.1       cgd 1:
1.1       cgd 	st	%f0, [%sp + 64]		! return result
1.1       cgd 	ld	[%sp + 64], %o0
1.1       cgd 	retl
1.1       cgd 	add	%sp, 8, %sp