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/* $OpenBSD: flt_rounds.c,v 1.3 2012/06/25 17:01:11 deraadt Exp $ */
/*
* Copyright (c) 2006 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice, this permission notice, and the disclaimer below
* appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <float.h>
#include <machine/ieeefp.h>
static const int rndmap[] = {
1, /* round to nearest */
0, /* round to zero */
2, /* round to positive infinity */
3 /* round to negative infinity */
};
int
__flt_rounds()
{
#if !defined(SOFTFLOAT)
register_t fpscr;
__asm__ __volatile__ ("sts fpscr, %0" : "=r" (fpscr));
return rndmap[fpscr & 0x03];
#else
return rndmap[fpgetround()];
#endif
}
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