diff options
author | Kito Cheng <kito@andestech.com> | 2017-07-27 11:45:12 +0300 |
---|---|---|
committer | Jeff Johnston <jjohnstn@redhat.com> | 2017-08-17 19:54:56 +0300 |
commit | 7040b2de0883e8346af9c976cd711cf75307e854 (patch) | |
tree | a974232927342683efd84c7ae496dbc7d1362f95 /newlib/libm/machine/riscv/feraiseexcept.c | |
parent | 979d467ff6e39ee5c52cf1aac7a6c9c63058141c (diff) |
Add RISC-V port for libm
Contributor list:
- Michael Neilly <mneilly@yahoo.com>
- Kito Cheng <kito.cheng@gmail.com>
Diffstat (limited to 'newlib/libm/machine/riscv/feraiseexcept.c')
-rw-r--r-- | newlib/libm/machine/riscv/feraiseexcept.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/newlib/libm/machine/riscv/feraiseexcept.c b/newlib/libm/machine/riscv/feraiseexcept.c new file mode 100644 index 000000000..6f28632d1 --- /dev/null +++ b/newlib/libm/machine/riscv/feraiseexcept.c @@ -0,0 +1,85 @@ +/* + (c) Copyright 2017 Michael R. Neilly + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + * 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. + + * Neither the names of the copyright holders nor the names of their + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 + COPYRIGHT OWNER 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 <fenv.h> + +/* This implementation is intended to comply with the following + * specification: + * + * http://pubs.opengroup.org/onlinepubs/009695399/functions/feraiseexcept.html + * Referred to as 'feraiseexcept.html below. + * + * "The feraiseexcept() function shall attempt to raise the supported + * floating-point exceptions represented by the excepts argument. The + * order in which these floating-point exceptions are raised is + * unspecified, except that if the excepts argument represents IEC + * 60559 valid coincident floating-point exceptions for atomic + * operations (namely overflow and inexact, or underflow and inexact), + * then overflow or underflow shall be raised before inexact. Whether + * the feraiseexcept() function additionally raises the inexact + * floating-point exception whenever it raises the overflow or + * underflow floating-point exception is implementation-defined." + */ + +int feraiseexcept(int excepts) +{ + + /* Mask excepts to be sure only supported flag bits are set */ + + excepts &= FE_ALL_EXCEPT; + +#if __riscv_flen + + /* Set the requested exception flags */ + + asm volatile("csrs fflags, %0" : : "r"(excepts)); + + /* Per 'feraiseexcept.html: + * "If the argument is zero or if all the specified exceptions were + * successfully raised, feraiseexcept() shall return + * zero. Otherwise, it shall return a non-zero value." + */ + + /* Per "The RISC-V Instruction Set Manual: Volume I: User-Level ISA: + * Version 2.1": + * + * "As allowed by the standard, we do not support traps on + * floating-point exceptions in the base ISA, but instead require + * explicit checks of the flags in software." + * + */ + +#endif + + return (excepts != 0); +} |