/*****************************************************************************
 * Copyright (C) 2020-2021 MulticoreWare, Inc
 *
 * Authors: Hongbin Liu <liuhongbin1@huawei.com>
 *          Sebastian Pop <spop@amazon.com>
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
 *
 * This program is also available under a commercial proprietary license.
 * For more information, contact us at license @ x265.com.
 *****************************************************************************/

.arch           armv8-a

#define PFX3(prefix, name) prefix ## _ ## name
#define PFX2(prefix, name) PFX3(prefix, name)
#define PFX(name)          PFX2(X265_NS, name)

#ifdef __APPLE__
#define PREFIX 1
#endif

#ifdef PREFIX
#define EXTERN_ASM _
#define HAVE_AS_FUNC 0
#elif defined __clang__
#define EXTERN_ASM
#define HAVE_AS_FUNC 0
#define PREFIX 1
#else
#define EXTERN_ASM
#define HAVE_AS_FUNC 1
#endif

#ifdef __ELF__
#define ELF
#else
#ifdef PREFIX
#define ELF #
#else
#define ELF @
#endif
#endif

#if HAVE_AS_FUNC
#define FUNC
#else
#ifdef PREFIX
#define FUNC #
#else
#define FUNC @
#endif
#endif

#ifdef __APPLE__
.macro endfunc
ELF .size \name, . - \name
FUNC .endfunc
.endm
#endif

.macro function name, export=1
#ifdef __APPLE__
    .global \name
    endfunc
#else
    .macro endfunc
ELF     .size   \name, . - \name
FUNC    .endfunc
        .purgem endfunc
    .endm
#endif
        .align  2
.if \export == 1
        .global EXTERN_ASM\name
ELF     .hidden EXTERN_ASM\name
ELF     .type   EXTERN_ASM\name, %function
FUNC    .func   EXTERN_ASM\name
EXTERN_ASM\name:
.else
ELF     .hidden \name
ELF     .type   \name, %function
FUNC    .func   \name
\name:
.endif
.endm

.macro  const   name, align=2
    .macro endconst
ELF     .size   \name, . - \name
        .purgem endconst
    .endm
#ifdef __MACH__
    .const_data
#else
    .section .rodata
#endif
    .align          \align
\name:
.endm

.macro  movrel rd, val, offset=0
#if defined(__APPLE__)
  .if \offset < 0
        adrp            \rd, \val@PAGE
        add             \rd, \rd, \val@PAGEOFF
        sub             \rd, \rd, -(\offset)
  .else
        adrp            \rd, \val+(\offset)@PAGE
        add             \rd, \rd, \val+(\offset)@PAGEOFF
  .endif
#elif defined(PIC) && defined(_WIN32)
  .if \offset < 0
        adrp            \rd, \val
        add             \rd, \rd, :lo12:\val
        sub             \rd, \rd, -(\offset)
  .else
        adrp            \rd, \val+(\offset)
        add             \rd, \rd, :lo12:\val+(\offset)
  .endif
#elif defined(PIC)
        adrp            \rd, \val+(\offset)
        add             \rd, \rd, :lo12:\val+(\offset)
#else
        ldr             \rd, =\val+\offset
#endif
.endm

#define FENC_STRIDE 64
#define FDEC_STRIDE 32

.macro SUMSUB_AB sum, diff, a, b
    add             \sum,  \a, \b
    sub             \diff, \a, \b
.endm

.macro SUMSUB_ABCD s1, d1, s2, d2, a, b, c, d
    SUMSUB_AB       \s1, \d1, \a, \b
    SUMSUB_AB       \s2, \d2, \c, \d
.endm

.macro HADAMARD4_V r1, r2, r3, r4, t1, t2, t3, t4
    SUMSUB_ABCD     \t1, \t2, \t3, \t4, \r1, \r2, \r3, \r4
    SUMSUB_ABCD     \r1, \r3, \r2, \r4, \t1, \t3, \t2, \t4
.endm

.macro ABS2 a b
    abs             \a, \a
    abs             \b, \b
.endm

.macro ABS8 v0, v1, v2, v3, v4, v5, v6, v7
    ABS2            \v0, \v1
    ABS2            \v2, \v3
    ABS2            \v4, \v5
    ABS2            \v6, \v7
.endm

.macro vtrn t1, t2, s1, s2
    trn1            \t1, \s1, \s2
    trn2            \t2, \s1, \s2
.endm

.macro trn4 t1, t2, t3, t4, s1, s2, s3, s4
    vtrn            \t1, \t2, \s1, \s2
    vtrn            \t3, \t4, \s3, \s4
.endm