1 /* $OpenBSD: fpsetround.c,v 1.2 2021/04/30 16:13:00 drahn Exp $ */ 2 /* 3 * Copyright (c) 2021 Mark Kettenis <kettenis@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/types.h> 19 #include <ieeefp.h> 20 21 fp_rnd 22 fpsetround(fp_rnd rnd_dir) 23 { 24 uint32_t frm; 25 26 __asm volatile ("fsrm %0, %1" : "=r"(frm) : "r"(rnd_dir)); 27 28 /* Truncating to 2 bits means both RNE and RMM become FP_RN. */ 29 return frm & 0x3; 30 } 31