;*****************************************************************************
;* SIMD-optimized motion compensation estimation
;*****************************************************************************
;* Copyright (c) 2000, 2001 Fabrice Bellard
;* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
;*
;* 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

cextern pb_1
cextern pb_80
cextern pw_2

pb_unpack1: db 0, 0xFF, 1, 0xFF, 2, 0xFF, 3, 0xFF, 4, 0xFF, 5, 0xFF, 6, 0xFF, 0xFF, 0xFF
pb_unpack2: db 1, 0xFF, 2, 0xFF, 3, 0xFF, 4, 0xFF, 5, 0xFF, 6, 0xFF, 7, 0xFF, 0xFF, 0xFF

SECTION .text

%macro DIFF_PIXELS_1 4
    movh            %1, %3
    movh            %2, %4
    punpcklbw       %2, %1
    punpcklbw       %1, %1
    psubw           %1, %2
%endmacro

; %1=const uint8_t *pix1, %2=const uint8_t *pix2, %3=static offset, %4=stride, %5=stride*3
; %6=temporary storage location
; this macro requires $mmsize stack space (aligned) on %6 (except on SSE+x86-64)
%macro DIFF_PIXELS_8 6
    DIFF_PIXELS_1   m0, m7, [%1     +%3], [%2     +%3]
    DIFF_PIXELS_1   m1, m7, [%1+%4  +%3], [%2+%4  +%3]
    DIFF_PIXELS_1   m2, m7, [%1+%4*2+%3], [%2+%4*2+%3]
    add             %1, %5
    add             %2, %5
    DIFF_PIXELS_1   m3, m7, [%1     +%3], [%2     +%3]
    DIFF_PIXELS_1   m4, m7, [%1+%4  +%3], [%2+%4  +%3]
    DIFF_PIXELS_1   m5, m7, [%1+%4*2+%3], [%2+%4*2+%3]
    DIFF_PIXELS_1   m6, m7, [%1+%5  +%3], [%2+%5  +%3]
%ifdef m8
    DIFF_PIXELS_1   m7, m8, [%1+%4*4+%3], [%2+%4*4+%3]
%else
    mova          [%6], m0
    DIFF_PIXELS_1   m7, m0, [%1+%4*4+%3], [%2+%4*4+%3]
    mova            m0, [%6]
%endif
    sub             %1, %5
    sub             %2, %5
%endmacro

%macro HADAMARD8 0
    SUMSUB_BADC       w, 0, 1, 2, 3
    SUMSUB_BADC       w, 4, 5, 6, 7
    SUMSUB_BADC       w, 0, 2, 1, 3
    SUMSUB_BADC       w, 4, 6, 5, 7
    SUMSUB_BADC       w, 0, 4, 1, 5
    SUMSUB_BADC       w, 2, 6, 3, 7
%endmacro

%macro ABS1_SUM 3
    ABS1            %1, %2
    paddusw         %3, %1
%endmacro

%macro ABS2_SUM 6
    ABS2            %1, %2, %3, %4
    paddusw         %5, %1
    paddusw         %6, %2
%endmacro

%macro ABS_SUM_8x8_64 1
    ABS2            m0, m1, m8, m9
    ABS2_SUM        m2, m3, m8, m9, m0, m1
    ABS2_SUM        m4, m5, m8, m9, m0, m1
    ABS2_SUM        m6, m7, m8, m9, m0, m1
    paddusw         m0, m1
%endmacro

%macro ABS_SUM_8x8_32 1
    mova          [%1], m7
    ABS1            m0, m7
    ABS1            m1, m7
    ABS1_SUM        m2, m7, m0
    ABS1_SUM        m3, m7, m1
    ABS1_SUM        m4, m7, m0
    ABS1_SUM        m5, m7, m1
    ABS1_SUM        m6, m7, m0
    mova            m2, [%1]
    ABS1_SUM        m2, m7, m1
    paddusw         m0, m1
%endmacro

; FIXME: HSUM saturates at 64k, while an 8x8 hadamard or dct block can get up to
; about 100k on extreme inputs. But that's very unlikely to occur in natural video,
; and it's even more unlikely to not have any alternative mvs/modes with lower cost.
%macro HSUM 3
    movhlps         %2, %1
    paddusw         %1, %2
    pshuflw         %2, %1, 0xE
    paddusw         %1, %2
    pshuflw         %2, %1, 0x1
    paddusw         %1, %2
    movd            %3, %1
%endmacro

%macro HADAMARD8_DIFF 1
cglobal hadamard8_diff16, 5, 6, %1, 2*mmsize*ARCH_X86_32
    call hadamard8x8_diff %+ SUFFIX
    mov            r5d, eax

    add             r1, 8
    add             r2, 8
    call hadamard8x8_diff %+ SUFFIX
    add            r5d, eax

    cmp            r4d, 16
    jne .done

    lea             r1, [r1+r3*8-8]
    lea             r2, [r2+r3*8-8]
    call hadamard8x8_diff %+ SUFFIX
    add            r5d, eax

    add             r1, 8
    add             r2, 8
    call hadamard8x8_diff %+ SUFFIX
    add            r5d, eax

.done:
    mov            eax, r5d
    RET

cglobal hadamard8_diff, 4, 4, %1, 2*mmsize*ARCH_X86_32
    TAIL_CALL hadamard8x8_diff %+ SUFFIX, 0

; r1, r2 and r3 are not clobbered in this function, so 16x16 can
; simply call this 2x2x (and that's why we access rsp+gprsize
; everywhere, which is rsp of calling function)
hadamard8x8_diff %+ SUFFIX:
    lea                          r0, [r3*3]
    DIFF_PIXELS_8                r1, r2,  0, r3, r0, rsp+gprsize
    HADAMARD8
%if ARCH_X86_64
    TRANSPOSE8x8W                 0,  1,  2,  3,  4,  5,  6,  7,  8
%else
    TRANSPOSE8x8W                 0,  1,  2,  3,  4,  5,  6,  7, [rsp+gprsize], [rsp+mmsize+gprsize]
%endif
    HADAMARD8
    ABS_SUM_8x8         rsp+gprsize
    HSUM                        m0, m1, eax
    and                         eax, 0xFFFF
    ret
%endmacro

INIT_XMM sse2
%if ARCH_X86_64
%define ABS_SUM_8x8 ABS_SUM_8x8_64
%else
%define ABS_SUM_8x8 ABS_SUM_8x8_32
%endif
HADAMARD8_DIFF 10

INIT_XMM ssse3
%define ABS_SUM_8x8 ABS_SUM_8x8_64
HADAMARD8_DIFF 9

; int ff_sse*_sse2(MPVEncContext *v, const uint8_t *pix1, const uint8_t *pix2,
;                  ptrdiff_t line_size, int h)

%macro SUM_SQUARED_ERRORS 1
cglobal sse%1, 5,5,%1 < mmsize ? 6 : 8, v, pix1, pix2, lsize, h
    pxor      m0, m0         ; mm0 = 0
    pxor      m5, m5         ; m5 holds the sum

.next2lines: ; FIXME why are these unaligned movs? pix1[] is aligned
%if %1 < mmsize
    movh      m1, [pix1q]
    movh      m2, [pix2q]
    movh      m3, [pix1q+lsizeq]
    movh      m4, [pix2q+lsizeq]
    punpcklbw m1, m0
    punpcklbw m2, m0
    punpcklbw m3, m0
    punpcklbw m4, m0
    psubw     m1, m2
    psubw     m3, m4
    pmaddwd   m1, m1
    pmaddwd   m3, m3
%else
    movu      m1, [pix1q]        ; m1 = pix1[0][0-15]
    movu      m2, [pix2q]        ; m2 = pix2[0][0-15]
    movu      m3, [pix1q+lsizeq] ; m3 = pix1[1][0-15]
    movu      m4, [pix2q+lsizeq] ; m4 = pix2[1][0-15]

    ; todo: mm1-mm2, mm3-mm4
    ; algo: subtract mm1 from mm2 with saturation and vice versa
    ;       OR the result to get the absolute difference
    mova      m6, m1
    mova      m7, m3
    psubusb   m1, m2
    psubusb   m3, m4
    psubusb   m2, m6
    psubusb   m4, m7

    por       m2, m1
    por       m4, m3

    ; now convert to 16-bit vectors so we can square them
    mova      m1, m2
    mova      m3, m4

    punpckhbw m2, m0
    punpckhbw m4, m0
    punpcklbw m1, m0         ; mm1 not spread over (mm1,mm2)
    punpcklbw m3, m0         ; mm4 not spread over (mm3,mm4)

    pmaddwd   m2, m2
    pmaddwd   m4, m4
    pmaddwd   m1, m1
    pmaddwd   m3, m3

    paddd     m1, m2
    paddd     m3, m4
%endif
    paddd     m5, m1
    paddd     m5, m3

    lea    pix1q, [pix1q + 2*lsizeq]
    lea    pix2q, [pix2q + 2*lsizeq]
    sub       hd, 2
    jnz .next2lines

    HADDD     m5, m1
    movd     eax, m5         ; return value
    RET
%endmacro

INIT_XMM sse2
SUM_SQUARED_ERRORS 8
SUM_SQUARED_ERRORS 16

;-----------------------------------------------
;int ff_sum_abs_dctelem(const int16_t *block)
;-----------------------------------------------
; %1 = number of xmm registers used
; %2 = number of inline loops

%macro SUM_ABS_DCTELEM 2
cglobal sum_abs_dctelem, 1, 1, %1, block
    pxor    m0, m0
    pxor    m1, m1
%assign %%i 0
%rep %2
    mova      m2, [blockq+mmsize*(0+%%i)]
    mova      m3, [blockq+mmsize*(1+%%i)]
    mova      m4, [blockq+mmsize*(2+%%i)]
    mova      m5, [blockq+mmsize*(3+%%i)]
    ABS1_SUM  m2, m6, m0
    ABS1_SUM  m3, m6, m1
    ABS1_SUM  m4, m6, m0
    ABS1_SUM  m5, m6, m1
%assign %%i %%i+4
%endrep
    paddusw m0, m1
    HSUM    m0, m1, eax
    and     eax, 0xFFFF
    RET
%endmacro

INIT_XMM sse2
SUM_ABS_DCTELEM 7, 2
INIT_XMM ssse3
SUM_ABS_DCTELEM 6, 2

;------------------------------------------------------------------------------
; int ff_hf_noise*_ssse3(const uint8_t *pix1, ptrdiff_t lsize, int h)
;------------------------------------------------------------------------------
; %1 = 8/16, %2-5=m#, %6 = src
%macro HF_NOISE_PART1 6
%if %1 == mmsize
    movu      m%2, [%6]
    mova      m%3, m%2
    pslldq    m%2, 1
    psrldq    m%3, 1
    psrldq    m%2, 1
    mova      m%4, m%2
    mova      m%5, m%3
    punpcklbw m%2, m7
    punpcklbw m%3, m7
    punpckhbw m%4, m7
    punpckhbw m%5, m7
    psubw     m%2, m%3
    psubw     m%4, m%5
%else
    movh      m%2, [%6]
    pshufb    m%3, m%2, m5
    pshufb    m%2, m%2, m4
    psubw     m%2, m%3
%endif
%endmacro

; %1 = 8/16, %2-5 = m#
%macro HF_NOISE_PART2 5
%if %1 == mmsize
    psubw     m%2, m%3
    psubw     m%4, m%5
    pabsw     m%2, m%2
    pabsw     m%4, m%4
    paddw     m%2, m%4
%else
    psubw     m%2, m%3
    pabsw     m%2, m%2
%endif
    paddw      m0, m%2
%endmacro

; %1 = 8/16
%macro HF_NOISE 1
cglobal hf_noise%1, 3,3,(%1 == 8) ? 6 : 8, pix1, lsize, h
%if %1 == 8
    mova       m4, [pb_unpack1]
    mova       m5, [pb_unpack2]
%else
    pxor       m4, m4
%endif
    sub        hd, 2
    pxor       m0, m0
    HF_NOISE_PART1 %1, 1, 2, 5, 7, pix1q
    HF_NOISE_PART1 %1, 3, 2, 6, 7, pix1q+lsizeq
    lea     pix1q, [pix1q+2*lsizeq]
    HF_NOISE_PART2 %1, 1, 3, 5, 6
.loop:
    HF_NOISE_PART1 %1, 1, 2, 5, 7, pix1q
    HF_NOISE_PART2 %1, 3, 1, 6, 5
    HF_NOISE_PART1 %1, 3, 2, 6, 7, pix1q+lsizeq
    lea     pix1q, [pix1q+2*lsizeq]
    HF_NOISE_PART2 %1, 1, 3, 5, 6
    sub        hd, 2
        jne .loop

%if %1 == 8
    pxor       m4, m4
%endif
    movhlps    m1, m0
    paddw      m0, m1
    punpcklwd  m0, m4
    HADDD      m0, m1
    movd      eax, m0   ; eax = result of hf_noise;
    RET                 ; return eax;
%endmacro

INIT_XMM ssse3
HF_NOISE 8
HF_NOISE 16

;---------------------------------------------------------------------------------------
;int ff_sad_<opt>(MPVEncContext *v, const uint8_t *pix1, const uint8_t *pix2, ptrdiff_t stride, int h);
;---------------------------------------------------------------------------------------
;%1 = 8/16, %2 = a/u (whether pix1 is aligned or not)
%macro SAD 1-2
%ifidn %2, u
cglobal sad%1u, 5, 5, 5, v, pix1, pix2, stride, h
%else
cglobal sad%1,  5, 5, 3, v, pix1, pix2, stride, h
%endif
    movu      m2, [pix2q]
    movu      m1, [pix2q+strideq]
%ifidn %2, u
    movu      m0, [pix1q]
    movu      m3, [pix1q+strideq]
    psadbw    m2, m0
    psadbw    m1, m3
%else
    psadbw    m2, [pix1q]
    psadbw    m1, [pix1q+strideq]
%endif
    paddw     m2, m1
    sub       hd, 2

align 16
.loop:
    lea    pix1q, [pix1q+strideq*2]
    lea    pix2q, [pix2q+strideq*2]
    movu      m0, [pix2q]
    movu      m1, [pix2q+strideq]
%ifidn %2, u
    movu      m3, [pix1q]
    movu      m4, [pix1q+strideq]
    psadbw    m0, m3
    psadbw    m1, m4
%else
    psadbw    m0, [pix1q]
    psadbw    m1, [pix1q+strideq]
%endif
    paddw     m2, m0
    paddw     m2, m1
    sub       hd, 2
    jg .loop
%if mmsize == 16
    movhlps   m0, m2
    paddw     m2, m0
%endif
    movd     eax, m2
    RET
%endmacro

INIT_MMX mmxext
SAD 8
INIT_XMM sse2
SAD 16
SAD 16, u

;------------------------------------------------------------------------------------------
;int ff_sad_x2_<opt>(MPVEncContext *v, const uint8_t *pix1, const uint8_t *pix2, ptrdiff_t stride, int h);
;------------------------------------------------------------------------------------------
;%1 = 8/16
%macro SAD_X2 1
cglobal sad%1_x2, 5, 5, 5, v, pix1, pix2, stride, h
    movu      m0, [pix2q]
    movu      m2, [pix2q+strideq]
%if mmsize == 16
    movu      m3, [pix2q+1]
    movu      m4, [pix2q+strideq+1]
    pavgb     m0, m3
    pavgb     m2, m4
%else
    pavgb     m0, [pix2q+1]
    pavgb     m2, [pix2q+strideq+1]
%endif
    psadbw    m0, [pix1q]
    psadbw    m2, [pix1q+strideq]
    paddw     m0, m2
    sub       hd, 2

align 16
.loop:
    lea    pix1q, [pix1q+2*strideq]
    lea    pix2q, [pix2q+2*strideq]
    movu      m1, [pix2q]
    movu      m2, [pix2q+strideq]
%if mmsize == 16
    movu      m3, [pix2q+1]
    movu      m4, [pix2q+strideq+1]
    pavgb     m1, m3
    pavgb     m2, m4
%else
    pavgb     m1, [pix2q+1]
    pavgb     m2, [pix2q+strideq+1]
%endif
    psadbw    m1, [pix1q]
    psadbw    m2, [pix1q+strideq]
    paddw     m0, m1
    paddw     m0, m2
    sub       hd, 2
    jg .loop
%if mmsize == 16
    movhlps   m1, m0
    paddw     m0, m1
%endif
    movd     eax, m0
    RET
%endmacro

INIT_MMX mmxext
SAD_X2 8
INIT_XMM sse2
SAD_X2 16

;------------------------------------------------------------------------------------------
;int ff_sad_y2_<opt>(MPVEncContext *v, const uint8_t *pix1, const uint8_t *pix2, ptrdiff_t stride, int h);
;------------------------------------------------------------------------------------------
;%1 = 8/16
%macro SAD_Y2 1
cglobal sad%1_y2, 5, 5, 4, v, pix1, pix2, stride, h
    movu      m1, [pix2q]
    movu      m0, [pix2q+strideq]
    movu      m3, [pix2q+2*strideq]
    pavgb     m1, m0
    pavgb     m0, m3
    psadbw    m1, [pix1q]
    psadbw    m0, [pix1q+strideq]
    paddw     m0, m1
    mova      m1, m3
    add    pix2q, strideq
    sub       hd, 2

align 16
.loop:
    lea    pix1q, [pix1q+2*strideq]
    lea    pix2q, [pix2q+2*strideq]
    movu      m2, [pix2q]
    movu      m3, [pix2q+strideq]
    pavgb     m1, m2
    pavgb     m2, m3
    psadbw    m1, [pix1q]
    psadbw    m2, [pix1q+strideq]
    paddw     m0, m1
    paddw     m0, m2
    mova      m1, m3
    sub       hd, 2
    jg .loop
%if mmsize == 16
    movhlps   m1, m0
    paddw     m0, m1
%endif
    movd     eax, m0
    RET
%endmacro

INIT_MMX mmxext
SAD_Y2 8
INIT_XMM sse2
SAD_Y2 16

;------------------------------------------------------------------------------------------
;int ff_sad_xy2_<opt>(MPVEncContext *v, const uint8_t *pix1, const uint8_t *pix2, ptrdiff_t stride, int h);
;------------------------------------------------------------------------------------------

;%1 = 8/16, %2 = aligned mov, %3 = unaligned mov
%macro SAD_XY2 3
cglobal sad%1_xy2, 5, 5, mmsize == 16 ? 8 + ARCH_X86_64 : 7, v, pix1, pix2, stride, h
    mov%3     m2, [pix2q]
    mov%3     m3, [pix2q+1]
%if %1 == mmsize
%if ARCH_X86_64
    mova      m8, [pw_2]
    %define PW_2 m8
%else
    %define PW_2 [pw_2]
%endif
%else ; %1 != mmsize
    mova      m6, [pw_2]
    %define PW_2 m6
%endif
    pxor      m1, m1
    add    pix2q, strideq
%if %1 != mmsize/2
    mova      m6, m2
    mova      m7, m3
    punpckhbw m6, m1
    punpckhbw m7, m1
    paddw     m6, m7
%endif
    punpcklbw m2, m1
    punpcklbw m3, m1
    paddw     m2, m3
    mova      m0, m1

.loop:
    mov%3     m3, [pix2q]
    mov%3     m4, [pix2q+1]
%if %1 != mmsize/2
    mova      m5, m3
    mova      m7, m4
    punpckhbw m5, m1
    punpckhbw m7, m1
    paddw     m7, m5
    paddw     m7, PW_2
    paddw     m6, m7
    psraw     m6, 2
%endif
    mov%2     m5, [pix1q]
    punpcklbw m3, m1
    punpcklbw m4, m1
    paddw     m3, m4
    paddw     m3, PW_2
    paddw     m2, m3
    psraw     m2, 2
    packuswb  m2, m6
    psadbw    m2, m5
    paddw     m0, m2

    mov%3     m2, [pix2q+strideq]
    mov%3     m4, [pix2q+strideq+1]
%if %1 != mmsize/2
    mova      m5, m2
    mova      m6, m4
    punpckhbw m5, m1
    punpckhbw m6, m1
    paddw     m6, m5
    paddw     m7, m6
    psraw     m7, 2
%endif
    mov%2     m5, [pix1q+strideq]
    punpcklbw m2, m1
    punpcklbw m4, m1
    paddw     m2, m4
    paddw     m3, m2
    psraw     m3, 2
    packuswb  m3, m7
    psadbw    m3, m5
    paddw     m0, m3

    sub       hd, 2
    lea    pix1q, [pix1q+2*strideq]
    lea    pix2q, [pix2q+2*strideq]
    jnz    .loop

%if %1 == 16
    movhlps   m1, m0
    paddw     m0, m1
%endif
    movd     eax, m0
    RET
%endmacro

INIT_XMM sse2
SAD_XY2  8, h, h
SAD_XY2 16, a, u

;-------------------------------------------------------------------------------------------
;int ff_sad_approx_xy2_<opt>(MPVEncContext *v, const uint8_t *pix1, const uint8_t *pix2, ptrdiff_t stride, int h);
;-------------------------------------------------------------------------------------------
;%1 = 8/16
%macro SAD_APPROX_XY2 1
cglobal sad%1_approx_xy2, 5, 5, 7, v, pix1, pix2, stride, h
    mova      m4, [pb_1]
    movu      m1, [pix2q]
    movu      m0, [pix2q+strideq]
    movu      m3, [pix2q+2*strideq]
%if mmsize == 16
    movu      m5, [pix2q+1]
    movu      m6, [pix2q+strideq+1]
    movu      m2, [pix2q+2*strideq+1]
    pavgb     m1, m5
    pavgb     m0, m6
    pavgb     m3, m2
%else
    pavgb     m1, [pix2q+1]
    pavgb     m0, [pix2q+strideq+1]
    pavgb     m3, [pix2q+2*strideq+1]
%endif
    psubusb   m0, m4
    pavgb     m1, m0
    pavgb     m0, m3
    psadbw    m1, [pix1q]
    psadbw    m0, [pix1q+strideq]
    paddw     m0, m1
    mova      m1, m3
    add    pix2q, strideq
    sub       hd, 2

align 16
.loop:
    lea    pix1q, [pix1q+2*strideq]
    lea    pix2q, [pix2q+2*strideq]
    movu      m2, [pix2q]
    movu      m3, [pix2q+strideq]
%if mmsize == 16
    movu      m5, [pix2q+1]
    movu      m6, [pix2q+strideq+1]
    pavgb     m2, m5
    pavgb     m3, m6
%else
    pavgb     m2, [pix2q+1]
    pavgb     m3, [pix2q+strideq+1]
%endif
    psubusb   m2, m4
    pavgb     m1, m2
    pavgb     m2, m3
    psadbw    m1, [pix1q]
    psadbw    m2, [pix1q+strideq]
    paddw     m0, m1
    paddw     m0, m2
    mova      m1, m3
    sub       hd, 2
    jg .loop
%if mmsize == 16
    movhlps   m1, m0
    paddw     m0, m1
%endif
    movd     eax, m0
    RET
%endmacro

INIT_MMX mmxext
SAD_APPROX_XY2 8
INIT_XMM sse2
SAD_APPROX_XY2 16

;--------------------------------------------------------------------
;int ff_vsad_intra(MPVEncContext *v, const uint8_t *pix1, const uint8_t *pix2,
;                  ptrdiff_t line_size, int h);
;--------------------------------------------------------------------
; %1 = 8/16, %2 = a/u (whether pix1 is aligned or not)
%macro VSAD_INTRA 2
%ifidn %2, u
cglobal vsad_intra%1u, 5, 5, 3, v, pix1, pix2, lsize, h
%else
cglobal vsad_intra%1,  5, 5, 3, v, pix1, pix2, lsize, h
%endif
    mov%2     m0, [pix1q]
    mov%2     m2, [pix1q+lsizeq]
    psadbw    m0, m2
    sub       hd, 2

.loop:
    lea    pix1q, [pix1q + 2*lsizeq]
    mov%2     m1, [pix1q]
    psadbw    m2, m1
    paddw     m0, m2
    mov%2     m2, [pix1q+lsizeq]
    psadbw    m1, m2
    paddw     m0, m1
    sub       hd, 2
    jg     .loop

%if mmsize == 16
    pshufd m1, m0, 0xe
    paddd  m0, m1
%endif
    movd eax, m0
    RET
%endmacro

INIT_MMX mmxext
VSAD_INTRA  8, a
INIT_XMM sse2
VSAD_INTRA 16, a
VSAD_INTRA 16, u

;---------------------------------------------------------------------
;int ff_vsad_approx(MPVEncContext *v, const uint8_t *pix1, const uint8_t *pix2,
;                   ptrdiff_t line_size, int h);
;---------------------------------------------------------------------
; %1 = 8/16, %2 = a/u (whether pix1 is aligned or not)
%macro VSAD_APPROX 2
%ifidn %2, u
cglobal vsad%1u_approx, 5, 5, 5, v, pix1, pix2, lsize, h
%else
cglobal vsad%1_approx,  5, 5, 5, v, pix1, pix2, lsize, h
%endif
    mova   m1, [pb_80]
    mov%2  m0, [pix1q]
    mov%2  m4, [pix1q+lsizeq]
%if mmsize == 16
    movu   m3, [pix2q]
    movu   m2, [pix2q+lsizeq]
    psubb  m0, m3
    psubb  m4, m2
%else
    psubb  m0, [pix2q]
    psubb  m4, [pix2q+lsizeq]
%endif
    pxor   m0, m1
    pxor   m4, m1
    psadbw m0, m4
    sub    hd, 2

.loop:
    lea pix1q, [pix1q + 2*lsizeq]
    lea pix2q, [pix2q + 2*lsizeq]
    mov%2  m2, [pix1q]
%if mmsize == 16
    movu   m3, [pix2q]
    psubb  m2, m3
%else
    psubb  m2, [pix2q]
%endif
    pxor   m2, m1
    psadbw m4, m2
    paddw  m0, m4
    mov%2  m4, [pix1q+lsizeq]
    movu   m3, [pix2q+lsizeq]
    psubb  m4, m3
    pxor   m4, m1
    psadbw m2, m4
    paddw  m0, m2
    sub    hd, 2
    jg  .loop

%if mmsize == 16
    pshufd m1, m0, 0xe
    paddd  m0, m1
%endif
    movd  eax, m0
    RET
%endmacro

INIT_MMX mmxext
VSAD_APPROX 8,  a
INIT_XMM sse2
VSAD_APPROX 16, a
VSAD_APPROX 16, u