pcsx2/common/include/Utilities/MemsetFast.inl

/*  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/>.
 */

#pragma once

#include <xmmintrin.h>

#define StoreDestIdx(idx) \
    case idx:             \
        _mm_store_ps(&destxmm[idx - 1][0], srcreg)

template <u8 data>
__noinline void memset_sse_a(void *dest, const size_t size)
{
    const uint MZFqwc = size / 16;

    pxAssert((size & 0xf) == 0);

    __m128 srcreg;

    if (data != 0) {
        static __aligned16 const u8 loadval[8] = {data, data, data, data, data, data, data, data};
        srcreg = _mm_loadh_pi(_mm_load_ps((float *)loadval), (__m64 *)loadval);
    } else
        srcreg = _mm_setzero_ps();

    float(*destxmm)[4] = (float(*)[4])dest;

    switch (MZFqwc & 0x07) {
        StoreDestIdx(0x07);
        StoreDestIdx(0x06);
        StoreDestIdx(0x05);
        StoreDestIdx(0x04);
        StoreDestIdx(0x03);
        StoreDestIdx(0x02);
        StoreDestIdx(0x01);
    }

    destxmm += (MZFqwc & 0x07);
    for (uint i = 0; i < MZFqwc / 8; ++i, destxmm += 8) {
        _mm_store_ps(&destxmm[0][0], srcreg);
        _mm_store_ps(&destxmm[1][0], srcreg);
        _mm_store_ps(&destxmm[2][0], srcreg);
        _mm_store_ps(&destxmm[3][0], srcreg);
        _mm_store_ps(&destxmm[4][0], srcreg);
        _mm_store_ps(&destxmm[5][0], srcreg);
        _mm_store_ps(&destxmm[6][0], srcreg);
        _mm_store_ps(&destxmm[7][0], srcreg);
    }
};

static __fi void memzero_sse_a(void *dest, const size_t size)
{
    memset_sse_a<0>(dest, size);
}

#undef StoreDestIdx

template <u8 data, typename T>
__noinline void memset_sse_a(T &dest)
{
    static_assert((sizeof(dest) & 0xf) == 0, "Bad size for SSE memset");
    memset_sse_a<data>(&dest, sizeof(dest));
}

template <typename T>
void memzero_sse_a(T &dest)
{
    static_assert((sizeof(dest) & 0xf) == 0, "Bad size for SSE memset");
    memset_sse_a<0>(&dest, sizeof(dest));
}