7dbbb6dde3
are workarounds for various symptoms of the problem described in clang bugs 3929, 8100, 8241, 10409, and 12958. The regression tests did their job: they failed, someone brought it up on the mailing lists, and then the issue got ignored for 6 months. Oops. There may still be some regressions for functions we don't have test coverage for yet.
60 lines
2.2 KiB
C
60 lines
2.2 KiB
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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <fenv.h>
|
|
#include <math.h>
|
|
|
|
/*
|
|
* We save and restore the floating-point environment to avoid raising
|
|
* an inexact exception. We can get away with using fesetenv()
|
|
* instead of feclearexcept()/feupdateenv() to restore the environment
|
|
* because the only exception defined for rint() is overflow, and
|
|
* rounding can't overflow as long as emax >= p.
|
|
*
|
|
* The volatile keyword is needed below because clang incorrectly assumes
|
|
* that rint won't raise any floating-point exceptions. Declaring ret volatile
|
|
* is sufficient to trick the compiler into doing the right thing.
|
|
*/
|
|
#define DECL(type, fn, rint) \
|
|
type \
|
|
fn(type x) \
|
|
{ \
|
|
volatile type ret; \
|
|
fenv_t env; \
|
|
\
|
|
fegetenv(&env); \
|
|
ret = rint(x); \
|
|
fesetenv(&env); \
|
|
return (ret); \
|
|
}
|
|
|
|
DECL(double, nearbyint, rint)
|
|
DECL(float, nearbyintf, rintf)
|
|
DECL(long double, nearbyintl, rintl)
|