;******************************************************************************
;* SIMD lossless video DSP utils
;* Copyright (c) 2008 Loren Merritt
;* Copyright (c) 2014 Michael Niedermayer
;*
;* This file is part of FFmpeg.
;*
;* FFmpeg 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 Foundation; either
;* version 2.1 of the License, or (at your option) any later version.
;*
;* FFmpeg 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
;* Lesser General Public License for more details.
;*
;* You should have received a copy of the GNU Lesser General Public
;* License along with FFmpeg; if not, write to the Free Software
;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;******************************************************************************

%include "libavutil/x86/x86util.asm"

SECTION_RODATA

pb_ef: times 8 db 14,15
pb_67: times 8 db  6, 7
pb_zzzz2323zzzzabab: db -1,-1,-1,-1, 2, 3, 2, 3,-1,-1,-1,-1,10,11,10,11
pb_zzzzzzzz67676767: db -1,-1,-1,-1,-1,-1,-1,-1, 6, 7, 6, 7, 6, 7, 6, 7

SECTION_TEXT

%macro INT16_LOOP 2 ; %1 = a/u (aligned/unaligned), %2 = add/sub
    movd    m4, maskd
    SPLATW  m4, m4
    add     wd, wd
    test    wq, 2*mmsize - 1
    jz %%.tomainloop
%%.wordloop:
    sub     wq, 2
%ifidn %2, add
    mov     ax, [srcq+wq]
    add     ax, [dstq+wq]
%else
    mov     ax, [src1q+wq]
    sub     ax, [src2q+wq]
%endif
    and     ax, maskw
    mov     [dstq+wq], ax
    test    wq, 2*mmsize - 1
    jnz %%.wordloop
%%.tomainloop:
%ifidn %2, add
    add     srcq, wq
%else
    add     src1q, wq
    add     src2q, wq
%endif
    add     dstq, wq
    neg     wq
    jz      %%.end
%%.loop:
%ifidn %2, add
    mov%1   m0, [srcq+wq]
    mov%1   m1, [dstq+wq]
    mov%1   m2, [srcq+wq+mmsize]
    mov%1   m3, [dstq+wq+mmsize]
%else
    mov%1   m0, [src1q+wq]
    mov%1   m1, [src2q+wq]
    mov%1   m2, [src1q+wq+mmsize]
    mov%1   m3, [src2q+wq+mmsize]
%endif
    p%2w    m0, m1
    p%2w    m2, m3
    pand    m0, m4
    pand    m2, m4
    mov%1   [dstq+wq]       , m0
    mov%1   [dstq+wq+mmsize], m2
    add     wq, 2*mmsize
    jl %%.loop
%%.end:
    RET
%endmacro

INIT_MMX mmx
cglobal add_int16, 4,4,5, dst, src, mask, w
    INT16_LOOP a, add

INIT_XMM sse2
cglobal add_int16, 4,4,5, dst, src, mask, w
    test srcq, mmsize-1
    jnz .unaligned
    test dstq, mmsize-1
    jnz .unaligned
    INT16_LOOP a, add
.unaligned:
    INT16_LOOP u, add

INIT_MMX mmx
cglobal diff_int16, 5,5,5, dst, src1, src2, mask, w
    INT16_LOOP a, sub

INIT_XMM sse2
cglobal diff_int16, 5,5,5, dst, src1, src2, mask, w
    test src1q, mmsize-1
    jnz .unaligned
    test src2q, mmsize-1
    jnz .unaligned
    test dstq, mmsize-1
    jnz .unaligned
    INT16_LOOP a, sub
.unaligned:
    INT16_LOOP u, sub


%macro ADD_HFYU_LEFT_LOOP_INT16 2 ; %1 = dst alignment (a/u), %2 = src alignment (a/u)
    add     wd, wd
    add     srcq, wq
    add     dstq, wq
    neg     wq
%%.loop:
    mov%2   m1, [srcq+wq]
    mova    m2, m1
    pslld   m1, 16
    paddw   m1, m2
    mova    m2, m1

    pshufb  m1, m3
    paddw   m1, m2
    pshufb  m0, m5
%if mmsize == 16
    mova    m2, m1
    pshufb  m1, m4
    paddw   m1, m2
%endif
    paddw   m0, m1
    pand    m0, m7
%ifidn %1, a
    mova    [dstq+wq], m0
%else
    movq    [dstq+wq], m0
    movhps  [dstq+wq+8], m0
%endif
    add     wq, mmsize
    jl %%.loop
    mov     eax, mmsize-1
    sub     eax, wd
    mov     wd, eax
    shl     wd, 8
    lea     eax, [wd+eax-1]
    movd    m1, eax
    pshufb  m0, m1
    movd    eax, m0
    RET
%endmacro

; int add_hfyu_left_prediction_int16(uint16_t *dst, const uint16_t *src, unsigned mask, int w, int left)
INIT_MMX ssse3
cglobal add_hfyu_left_prediction_int16, 4,4,8, dst, src, mask, w, left
.skip_prologue:
    mova    m5, [pb_67]
    mova    m3, [pb_zzzz2323zzzzabab]
    movd    m0, leftm
    psllq   m0, 48
    movd    m7, maskm
    SPLATW  m7 ,m7
    ADD_HFYU_LEFT_LOOP_INT16 a, a

INIT_XMM sse4
cglobal add_hfyu_left_prediction_int16, 4,4,8, dst, src, mask, w, left
    mova    m5, [pb_ef]
    mova    m4, [pb_zzzzzzzz67676767]
    mova    m3, [pb_zzzz2323zzzzabab]
    movd    m0, leftm
    pslldq  m0, 14
    movd    m7, maskm
    SPLATW  m7 ,m7
    test    srcq, 15
    jnz .src_unaligned
    test    dstq, 15
    jnz .dst_unaligned
    ADD_HFYU_LEFT_LOOP_INT16 a, a
.dst_unaligned:
    ADD_HFYU_LEFT_LOOP_INT16 u, a
.src_unaligned:
    ADD_HFYU_LEFT_LOOP_INT16 u, u

; void add_hfyu_median_prediction_mmxext(uint8_t *dst, const uint8_t *top, const uint8_t *diff, int mask, int w, int *left, int *left_top)
INIT_MMX mmxext
cglobal add_hfyu_median_prediction_int16, 7,7,0, dst, top, diff, mask, w, left, left_top
    add      wd, wd
    movd    mm6, maskd
    SPLATW  mm6, mm6
    movq    mm0, [topq]
    movq    mm2, mm0
    movd    mm4, [left_topq]
    psllq   mm2, 16
    movq    mm1, mm0
    por     mm4, mm2
    movd    mm3, [leftq]
    psubw   mm0, mm4 ; t-tl
    add    dstq, wq
    add    topq, wq
    add   diffq, wq
    neg      wq
    jmp .skip
.loop:
    movq    mm4, [topq+wq]
    movq    mm0, mm4
    psllq   mm4, 16
    por     mm4, mm1
    movq    mm1, mm0 ; t
    psubw   mm0, mm4 ; t-tl
.skip:
    movq    mm2, [diffq+wq]
%assign i 0
%rep 4
    movq    mm4, mm0
    paddw   mm4, mm3 ; t-tl+l
    pand    mm4, mm6
    movq    mm5, mm3
    pmaxsw  mm3, mm1
    pminsw  mm5, mm1
    pminsw  mm3, mm4
    pmaxsw  mm3, mm5 ; median
    paddw   mm3, mm2 ; +residual
    pand    mm3, mm6
%if i==0
    movq    mm7, mm3
    psllq   mm7, 48
%else
    movq    mm4, mm3
    psrlq   mm7, 16
    psllq   mm4, 48
    por     mm7, mm4
%endif
%if i<3
    psrlq   mm0, 16
    psrlq   mm1, 16
    psrlq   mm2, 16
%endif
%assign i i+1
%endrep
    movq [dstq+wq], mm7
    add      wq, 8
    jl .loop
    movzx   r2d, word [dstq-2]
    mov [leftq], r2d
    movzx   r2d, word [topq-2]
    mov [left_topq], r2d
    RET

cglobal sub_hfyu_median_prediction_int16, 7,7,0, dst, src1, src2, mask, w, left, left_top
    add      wd, wd
    movd    mm7, maskd
    SPLATW  mm7, mm7
    movq    mm0, [src1q]
    movq    mm2, [src2q]
    psllq   mm0, 16
    psllq   mm2, 16
    movd    mm6, [left_topq]
    por     mm0, mm6
    movd    mm6, [leftq]
    por     mm2, mm6
    xor     maskq, maskq
.loop:
    movq    mm1, [src1q + maskq]
    movq    mm3, [src2q + maskq]
    movq    mm4, mm2
    psubw   mm2, mm0
    paddw   mm2, mm1
    pand    mm2, mm7
    movq    mm5, mm4
    pmaxsw  mm4, mm1
    pminsw  mm1, mm5
    pminsw  mm4, mm2
    pmaxsw  mm4, mm1
    psubw   mm3, mm4
    pand    mm3, mm7
    movq    [dstq + maskq], mm3
    add     maskq, 8
    movq    mm0, [src1q + maskq - 2]
    movq    mm2, [src2q + maskq - 2]
    cmp     maskq, wq
        jb .loop
    mov maskd, [src1q + wq - 2]
    mov [left_topq], maskd
    mov maskd, [src2q + wq - 2]
    mov [leftq], maskd
    RET
