/*

This file is part of FFTS -- The Fastest Fourier Transform in the South

Copyright (c) 2013, Michael J. Cree <mcree@orcon.net.nz>
Copyright (c) 2012, 2013, Anthony M. Blake <amb@anthonix.com>

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* 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.
* Neither the name of the organization nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 ANTHONY M. BLAKE 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.

*/

#ifndef FFTS_MACROS_H
#define FFTS_MACROS_H

#if defined (_MSC_VER) && (_MSC_VER >= 1020)
#pragma once
#endif

#ifdef HAVE_NEON
#include "macros-neon.h"
#else
#ifdef __alpha__
#include "macros-alpha.h"
#else
#ifdef __powerpc__
#include "macros-altivec.h"
#endif
#endif
#endif

#ifdef HAVE_VFP
#include "macros-alpha.h"
#endif

#ifdef HAVE_SSE
#include "macros-sse.h"
#endif

static FFTS_INLINE void TX2(V *a, V *b)
{
    V TX2_t0 = VUNPACKLO(*a, *b);
    V TX2_t1 = VUNPACKHI(*a, *b);
    *a = TX2_t0;
    *b = TX2_t1;
}

static FFTS_INLINE void K_N(int inv, V re, V im, V *r0, V *r1, V *r2, V *r3)
{
    V uk, uk2, zk_p, zk_n, zk, zk_d;

    uk  = *r0;
    uk2 = *r1;

    zk_p = IMUL(*r2, re, im);
    zk_n = IMULJ(*r3, re, im);

    zk = VADD(zk_p, zk_n);
    zk_d = IMULI(inv, VSUB(zk_p, zk_n));

    *r2 = VSUB(uk, zk);
    *r0 = VADD(uk, zk);
    *r3 = VADD(uk2, zk_d);
    *r1 = VSUB(uk2, zk_d);
}

static FFTS_INLINE void L_2_4(int inv, const data_t* FFTS_RESTRICT i0, const data_t* FFTS_RESTRICT i1,
                              const data_t* FFTS_RESTRICT i2, const data_t* FFTS_RESTRICT i3,
                              V *r0, V *r1, V *r2, V *r3)
{
    V t0, t1, t2, t3, t4, t5, t6, t7;

    t0 = VLD(i0);
    t1 = VLD(i1);
    t2 = VLD(i2);
    t3 = VLD(i3);

    t4 = VADD(t0, t1);
    t5 = VSUB(t0, t1);
    t6 = VADD(t2, t3);
    t7 = VSUB(t2, t3);

    *r0 = VUNPACKLO(t4, t5);
    *r1 = VUNPACKLO(t6, t7);

    t5 = IMULI(inv, t5);

    t0 = VADD(t6, t4);
    t2 = VSUB(t6, t4);
    t1 = VSUB(t7, t5);
    t3 = VADD(t7, t5);

    *r3 = VUNPACKHI(t0, t1);
    *r2 = VUNPACKHI(t2, t3);
}

static FFTS_INLINE void L_4_4(int inv, const data_t* FFTS_RESTRICT i0, const data_t* FFTS_RESTRICT i1,
                              const data_t* FFTS_RESTRICT i2, const data_t* FFTS_RESTRICT i3,
                              V *r0, V *r1, V *r2, V *r3)
{
    V t0, t1, t2, t3, t4, t5, t6, t7;

    t0 = VLD(i0);
    t1 = VLD(i1);
    t2 = VLD(i2);
    t3 = VLD(i3);

    t4 = VADD(t0, t1);
    t5 = VSUB(t0, t1);
    t6 = VADD(t2, t3);

    t7 = IMULI(inv, VSUB(t2, t3));

    t0 = VADD(t4, t6);
    t2 = VSUB(t4, t6);
    t1 = VSUB(t5, t7);
    t3 = VADD(t5, t7);

    TX2(&t0, &t1);
    TX2(&t2, &t3);

    *r0 = t0;
    *r2 = t1;
    *r1 = t2;
    *r3 = t3;
}

static FFTS_INLINE void L_4_2(int inv, const data_t * FFTS_RESTRICT i0, const data_t * FFTS_RESTRICT i1,
                              const data_t * FFTS_RESTRICT i2, const data_t * FFTS_RESTRICT i3,
                              V *r0, V *r1, V *r2, V *r3)
{
    V t0, t1, t2, t3, t4, t5, t6, t7;

    t0 = VLD(i0);
    t1 = VLD(i1);
    t6 = VLD(i2);
    t7 = VLD(i3);

    t2 = VBLEND(t6, t7);
    t3 = VBLEND(t7, t6);

    t4 = VADD(t0, t1);
    t5 = VSUB(t0, t1);
    t6 = VADD(t2, t3);
    t7 = VSUB(t2, t3);

    *r2 = VUNPACKHI(t4, t5);
    *r3 = VUNPACKHI(t6, t7);

    t7 = IMULI(inv, t7);

    t0 = VADD(t4, t6);
    t2 = VSUB(t4, t6);
    t1 = VSUB(t5, t7);
    t3 = VADD(t5, t7);

    *r0 = VUNPACKLO(t0, t1);
    *r1 = VUNPACKLO(t2, t3);
}

#define S_4(r0, r1, r2, r3, o0, o1, o2, o3) \
	VST(o0, r0); VST(o1, r1); VST(o2, r2); VST(o3, r3);

#endif /* FFTS_MACROS_H */