b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
94 lines
3.2 KiB
ArmAsm
94 lines
3.2 KiB
ArmAsm
/*
|
|
* Copyright (c) 1983, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
/*.asciz "@(#)ldexp.s 8.1 (Berkeley) 6/4/93" */
|
|
.asciz "$NetBSD: ldexp.S,v 1.6 2003/08/07 16:42:31 agc Exp $"
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
/*
|
|
* double ldexp (value, exp)
|
|
* double value;
|
|
* int exp;
|
|
*
|
|
* Ldexp returns value*2**exp, if that result is in range.
|
|
* If underflow occurs, it returns zero. If overflow occurs,
|
|
* it returns a value of appropriate sign and largest
|
|
* possible magnitude. In case of either overflow or underflow,
|
|
* errno is set to ERANGE. Note that errno is not modified if
|
|
* no error occurs.
|
|
*/
|
|
|
|
#include "DEFS.h"
|
|
|
|
/*
|
|
* don't include errno.h, ANSI C says it defines errno.
|
|
*
|
|
* #include <errno.h>
|
|
*/
|
|
#define ERANGE 34
|
|
|
|
.globl _C_LABEL(errno)
|
|
|
|
ENTRY(ldexp, 0)
|
|
movd 4(%ap),%r0 /* fetch "value" */
|
|
extzv $7,$8,%r0,%r2 /* %r2 := biased exponent */
|
|
jeql 1f /* if zero, done */
|
|
|
|
addl2 12(%ap),%r2 /* %r2 := new biased exponent */
|
|
jleq 2f /* if <= 0, underflow */
|
|
cmpl %r2,$256 /* otherwise check if too big */
|
|
jgeq 3f /* jump if overflow */
|
|
insv %r2,$7,$8,%r0 /* put exponent back in result */
|
|
1:
|
|
ret
|
|
2:
|
|
clrd %r0
|
|
jbr 1f
|
|
3:
|
|
movd huge,%r0 /* largest possible floating magnitude */
|
|
jbc $15,4(%ap),1f /* jump if argument was positive */
|
|
mnegd %r0,%r0 /* if arg < 0, make result negative */
|
|
1:
|
|
#ifdef _REENTRANT
|
|
pushl %r0
|
|
calls $0,_C_LABEL(__errno)
|
|
movl $ ERANGE,(%r0)
|
|
movl (%sp)+,%r0
|
|
#else
|
|
movl $ ERANGE,_C_LABEL(errno)
|
|
#endif
|
|
ret
|
|
|
|
.data
|
|
huge: .word 0x7fff /* the largest number that can */
|
|
.word 0xffff /* be represented in a long floating */
|
|
.word 0xffff /* number. This is given in hex in order */
|
|
.word 0xffff /* to avoid floating conversions */
|