diff options
Diffstat (limited to 'lib/libc/riscv/gen/flt_rounds.c')
-rw-r--r-- | lib/libc/riscv/gen/flt_rounds.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/lib/libc/riscv/gen/flt_rounds.c b/lib/libc/riscv/gen/flt_rounds.c new file mode 100644 index 0000000..179963c --- /dev/null +++ b/lib/libc/riscv/gen/flt_rounds.c @@ -0,0 +1,71 @@ +/*- + * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com> + * All rights reserved. + * + * Portions of this software were developed by SRI International and the + * University of Cambridge Computer Laboratory under DARPA/AFRL contract + * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme. + * + * Portions of this software were developed by the University of Cambridge + * Computer Laboratory as part of the CTSRD Project, with support from the + * UK Higher Education Innovation Fund (HEIF). + * + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> + +#include <fenv.h> +#include <float.h> + +int +__flt_rounds(void) +{ +#if 0 + uint64_t fcsr; +#endif + int mode; + +#if 0 + __asm __volatile("csrr %0, fcsr" : "=r" (fcsr)); + mode = (fcsr & _ROUND_MASK); +#endif + + /* RISCVTODO */ + mode = FE_TOWARDZERO; /* softfloat rounding mode */ + + switch (mode) { + case FE_TOWARDZERO: + return (0); + case FE_TONEAREST: + return (1); + case FE_UPWARD: + return (2); + case FE_DOWNWARD: + return (3); + } + + return (-1); +} |