pcsx2/common/src/Utilities/AlignedMalloc.cpp

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/* PCSX2 - PS2 Emulator for PCs
* Copyright (C) 2002-2009 PCSX2 Dev Team
*
* PCSX2 is free software: you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* PCSX2 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.
*
* You should have received a copy of the GNU General Public License along with PCSX2.
* If not, see <http://www.gnu.org/licenses/>.
*/
// This module contains implementations of _aligned_malloc for platforms that don't have
// it built into their CRT/libc.
#include "PrecompiledHeader.h"
struct AlignedMallocHeader
{
u32 size; // size of the allocated buffer (minus alignment and header)
void* baseptr; // offset of the original allocated pointer
};
static const uint headsize = sizeof(AlignedMallocHeader);
void* __fastcall pcsx2_aligned_malloc(size_t size, size_t align)
{
pxAssume( align < 0x10000 );
u8* p = (u8*)malloc(size+align+headsize);
// start alignment calculations from past the header.
uptr pasthead = (uptr)(p+headsize);
uptr aligned = (pasthead + align-1) & ~(align-1);
AlignedMallocHeader* header = (AlignedMallocHeader*)(aligned-headsize);
jASSUME( (uptr)header >= (uptr)p );
header->baseptr = p;
header->size = size;
return (void*)aligned;
}
void* __fastcall pcsx2_aligned_realloc(void* handle, size_t size, size_t align)
{
pxAssume( align < 0x10000 );
void* newbuf = pcsx2_aligned_malloc( size, align );
if( handle != NULL )
{
AlignedMallocHeader* header = (AlignedMallocHeader*)((uptr)handle - headsize);
memcpy_fast( newbuf, handle, std::min( size, header->size ) );
free( header->baseptr );
}
return newbuf;
}
__forceinline void pcsx2_aligned_free(void* pmem)
{
if( pmem == NULL ) return;
AlignedMallocHeader* header = (AlignedMallocHeader*)((uptr)pmem - headsize);
free( header->baseptr );
}
// ----------------------------------------------------------------------------
// And for lack of a better home ...
// Special unaligned memset used when all other optimized memsets fail (it's called from
// memzero_obj and stuff).
__forceinline void _memset16_unaligned( void* dest, u16 data, size_t size )
{
pxAssume( (size & 0x1) == 0 );
u16* dst = (u16*)dest;
for(int i=size; i; --i, ++dst )
*dst = data;
}
__forceinline void HostSys::Munmap( void* base, u32 size )
{
Munmap( (uptr)base, size );
}