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AP_Common: Added missing fenv exception functions from FreeBSD fenv tree 

Signed-off-by: Sandy Urazayev <ctu@ku.edu>
This commit is contained in:
Sandy Urazayev 2021-10-02 23:19:36 -05:00 committed by Peter Barker
parent 67fd862a8c
commit 644726ff50
1 changed files with 65 additions and 0 deletions
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65
libraries/AP_Common/missing/fenv.h
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@ -4,6 +4,7 @@
#ifndef HAVE_FEENABLEEXCEPT
#if defined(__APPLE__) && defined(__MACH__)
#if defined __i386__ || defined __x86_64__
// Public domain polyfill for feenableexcept on OS X
// http://www-personal.umich.edu/~williams/archive/computation/fe-handling-example.c
@ -46,6 +47,70 @@ inline int fedisableexcept(unsigned int excepts)
return fesetenv(&fenv) ? -1 : old_excepts;
}
#elif defined __arm64__
/*
Yoinked and adapted this ARM64 implementation of floating point exceptions from
https://android.googlesource.com/platform/bionic/+/a147a1d/libm/arm64/fenv.c
*/
/*-
* Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
* All rights reserved.
*
* 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.
*
* $FreeBSD: libm/aarch64/fenv.c $
*/
#define FPCR_EXCEPT_SHIFT 8
// FPCR, Floating-point Control Register.
#define __get_fpcr(__fpcr) __asm__ __volatile__("mrs %0,fpcr" : "=r" (__fpcr))
#define __set_fpcr(__fpcr) __asm__ __volatile__("msr fpcr,%0" : :"ri" (__fpcr))
inline int feenableexcept(int mask) {
unsigned long long old_fpcr, new_fpcr;
__get_fpcr(old_fpcr);
new_fpcr = old_fpcr | ((mask & FE_ALL_EXCEPT) << FPCR_EXCEPT_SHIFT);
if (new_fpcr != old_fpcr) {
__set_fpcr(new_fpcr);
}
return ((old_fpcr >> FPCR_EXCEPT_SHIFT) & FE_ALL_EXCEPT);
}
inline int fedisableexcept(int mask) {
unsigned long long old_fpcr, new_fpcr;
__get_fpcr(old_fpcr);
new_fpcr = old_fpcr & ~((mask & FE_ALL_EXCEPT) << FPCR_EXCEPT_SHIFT);
if (new_fpcr != old_fpcr) {
__set_fpcr(new_fpcr);
}
return ((old_fpcr >> FPCR_EXCEPT_SHIFT) & FE_ALL_EXCEPT);
}
#endif
#else
inline int feenableexcept(unsigned int excepts)
{