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/*-
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* 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.
*/
#include <machine/asm.h>
#if defined(LIBC_SCCS)
.text
.asciz "$OpenBSD: isinf.S,v 1.5 2003/06/02 20:18:31 millert Exp $"
#endif /* LIBC_SCCS */
#define DEXP_INF 0x7ff
/*
* isnan(x)
* double x;
*
* Return true if x is a NAN.
*/
LEAF(isnan)
.set noreorder
mfc1 v1, $f13 # get MSW of x
mfc1 t3, $f12 # get LSW of x
sll t1, v1, 1 # get x exponent
srl t1, t1, 32 - 11
bne t1, DEXP_INF, 2f # is it a finite number?
sll t2, v1, 32 - 20 # get x fraction
bne t3, zero, 1f # is it a NAN?
nop
beq t2, zero, 2f # its infinity
nop
1:
j ra
li v0, 1 # x is a NAN
2:
j ra
move v0, zero # x is NOT a NAN
END(isnan)
/*
* isinf(x)
* double x;
*
* Return true if x is infinity.
*/
LEAF(isinf)
.set noreorder
mfc1 v1, $f13 # get MSW of x
mfc1 t3, $f12 # get LSW of x
sll t1, v1, 1 # get x exponent
srl t1, t1, 32 - 11
bne t1, DEXP_INF, 1f # is it a finite number?
sll t2, v1, 32 - 20 # get x fraction
bne t3, zero, 1f # is it a NAN?
nop
bne t2, zero, 1f # is it a NAN?
nop
j ra
li v0, 1 # x is infinity
1:
j ra
move v0, zero # x is NOT infinity
END(isinf)
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