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/* $OpenBSD: fpsetround.c,v 1.1 2018/02/28 11:16:54 kettenis Exp $ */
/*
* Copyright (c) 2018 Mark Kettenis <kettenis@openbsd.org>
*
* 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 and this permission notice 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 <ieeefp.h>
#ifdef SOFTFLOAT_FOR_GCC
#include "softfloat-for-gcc.h"
#endif
#include "milieu.h"
#include <softfloat.h>
#include <stdint.h>
__weak_alias(_fpsetround,fpsetround);
fp_rnd
fpsetround(fp_rnd rnd_dir)
{
uint32_t old, new;
__asm volatile("vmrs %0, fpscr" : "=r" (old));
new = old & ~(3 << 22);
new |= (rnd_dir & 3) << 22;
__asm volatile("vmsr fpscr, %0" :: "r" (new));
float_rounding_mode = rnd_dir;
return ((old >> 22) & 3);
}
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