gcc/libstdc++-v3/libsupc++/new_opa.cc
Jonathan Wakely 84c08ec96a Replace modulus with mask operation in over-aligned new
2016-09-16  Jonathan Wakely  <jwakely@redhat.com>
	    Marc Glisse  <marc.glisse@inria.fr>

	* libsupc++/new_opa.cc [_GLIBCXX_HAVE_ALIGNED_ALLOC]
	(operator new(size_t, align_val_t)): Replace modulus operator with
	mask.

Co-Authored-By: Marc Glisse <marc.glisse@inria.fr>

From-SVN: r240192
2016-09-16 19:09:14 +01:00

86 lines
2.5 KiB
C++

// Support routines for the -*- C++ -*- dynamic memory management.
// Copyright (C) 1997-2016 Free Software Foundation, Inc.
//
// This file is part of GCC.
//
// GCC is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3, or (at your option)
// any later version.
//
// GCC is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
#include <bits/c++config.h>
#include <stdlib.h>
#include <bits/exception_defines.h>
#include "new"
using std::new_handler;
using std::bad_alloc;
#if !_GLIBCXX_HAVE_ALIGNED_ALLOC
#if _GLIBCXX_HAVE__ALIGNED_MALLOC
#define aligned_alloc(al,sz) _aligned_malloc(sz,al)
#elif _GLIBCXX_HAVE_POSIX_MEMALIGN
static inline void*
aligned_alloc (std::size_t al, std::size_t sz)
{
void *ptr;
// The value of alignment shall be a power of two multiple of sizeof(void *).
if (al < sizeof(void*))
al = sizeof(void*);
int ret = posix_memalign (&ptr, al, sz);
if (ret == 0)
return ptr;
return nullptr;
}
#elif _GLIBCXX_HAVE_MEMALIGN
#include <malloc.h>
#define aligned_alloc memalign
#else
// The C library doesn't provide any aligned allocation functions, declare
// aligned_alloc and get a link failure if aligned new is used.
extern "C" void *aligned_alloc(std::size_t, std::size_t);
#endif
#endif
_GLIBCXX_WEAK_DEFINITION void *
operator new (std::size_t sz, std::align_val_t al)
{
void *p;
std::size_t align = (std::size_t)al;
/* malloc (0) is unpredictable; avoid it. */
if (sz == 0)
sz = 1;
#if _GLIBCXX_HAVE_ALIGNED_ALLOC
/* C11: the value of size shall be an integral multiple of alignment. */
if (std::size_t rem = sz & (align - 1))
sz += align - rem;
#endif
while (__builtin_expect ((p = aligned_alloc (align, sz)) == 0, false))
{
new_handler handler = std::get_new_handler ();
if (! handler)
_GLIBCXX_THROW_OR_ABORT(bad_alloc());
handler ();
}
return p;
}