pcsx2/common/include/Utilities/lnx_memzero.h

/*  PCSX2 - PS2 Emulator for PCs
 *  Copyright (C) 2002-2010  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/>.
 */

#ifndef _LNX_MEMZERO_H_
#define _LNX_MEMZERO_H_

// This header contains non-optimized implementation of memzero_ptr and memset8, etc

template <u32 data, typename T>
static __fi void memset32(T &obj)
{
    // this function works on 32-bit aligned lengths of data only.
    // If the data length is not a factor of 32 bits, the C++ optimizing compiler will
    // probably just generate mysteriously broken code in Release builds. ;)

    pxAssume((sizeof(T) & 0x3) == 0);

    u32 *dest = (u32 *)&obj;
    for (int i = sizeof(T) >> 2; i; --i, ++dest)
        *dest = data;
}

template <typename T>
static __fi void memzero(T &obj)
{
    memset(&obj, 0, sizeof(T));
}

template <u8 data, typename T>
static __fi void memset8(T &obj)
{
    // Aligned sizes use the optimized 32 bit inline memset.  Unaligned sizes use memset.
    if ((sizeof(T) & 0x3) != 0)
        memset(&obj, data, sizeof(T));
    else {
        const u32 data32 = data + (data << 8) + (data << 16) + (data << 24);
        memset32<data32>(obj);
    }
}

// Code is only called in the init so no need to bother with ASM
template <u8 data, size_t bytes>
static __fi void memset_8(void *dest)
{
    memset(dest, data, bytes);
}

#endif