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/* $OpenBSD: fpsetround.c,v 1.2 2007/03/02 06:11:54 miod 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 <ieeefp.h>
fp_rnd
fpsetround(fp_rnd rnd_dir)
{
register_t fpscr, nfpscr;
#if defined(__SH4__) && !defined(__SH4_NOFPU__)
extern register_t __fpscr_values[2];
#endif
__asm__ __volatile__ ("sts fpscr, %0" : "=r" (fpscr));
if (rnd_dir == FP_RN || rnd_dir == FP_RZ) {
nfpscr = (fpscr & ~0x03) | rnd_dir;
#if defined(__SH4__) && !defined(__SH4_NOFPU__)
__fpscr_values[0] = (__fpscr_values[0] & ~0x03) | rnd_dir;
__fpscr_values[1] = (__fpscr_values[1] & ~0x03) | rnd_dir;
#endif
__asm__ __volatile__ ("lds %0, fpscr" : : "r" (nfpscr));
}
/* else how report an error? */
return (fpscr & 0x03);
}
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