;
;  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
;
;  Use of this source code is governed by a BSD-style license
;  that can be found in the LICENSE file in the root of the source
;  tree. An additional intellectual property rights grant can be found
;  in the file PATENTS.  All contributing project authors may
;  be found in the AUTHORS file in the root of the source tree.
;


    EXPORT  |vp8_loop_filter_horizontal_edge_y_neon|
    EXPORT  |vp8_loop_filter_horizontal_edge_uv_neon|
    EXPORT  |vp8_loop_filter_vertical_edge_y_neon|
    EXPORT  |vp8_loop_filter_vertical_edge_uv_neon|
    ARM
    REQUIRE8
    PRESERVE8

    AREA ||.text||, CODE, READONLY, ALIGN=2

; flimit, limit, and thresh should be positive numbers.
; All 16 elements in these variables are equal.

; void vp8_loop_filter_horizontal_edge_y_neon(unsigned char *src, int pitch,
;                                             const signed char *flimit,
;                                             const signed char *limit,
;                                             const signed char *thresh,
;                                             int count)
; r0    unsigned char *src
; r1    int pitch
; r2    const signed char *flimit
; r3    const signed char *limit
; sp    const signed char *thresh,
; sp+4  int count (unused)
|vp8_loop_filter_horizontal_edge_y_neon| PROC
    stmdb       sp!, {lr}
    vld1.s8     {d0[], d1[]}, [r2]          ; flimit
    vld1.s8     {d2[], d3[]}, [r3]          ; limit
    sub         r2, r0, r1, lsl #2          ; move src pointer down by 4 lines
    ldr         r12, [sp, #4]               ; load thresh pointer

    vld1.u8     {q3}, [r2], r1              ; p3
    vld1.u8     {q4}, [r2], r1              ; p2
    vld1.u8     {q5}, [r2], r1              ; p1
    vld1.u8     {q6}, [r2], r1              ; p0
    vld1.u8     {q7}, [r2], r1              ; q0
    vld1.u8     {q8}, [r2], r1              ; q1
    vld1.u8     {q9}, [r2], r1              ; q2
    vld1.u8     {q10}, [r2]                 ; q3
    vld1.s8     {d4[], d5[]}, [r12]         ; thresh
    sub         r0, r0, r1, lsl #1

    bl          vp8_loop_filter_neon

    vst1.u8     {q5}, [r0], r1              ; store op1
    vst1.u8     {q6}, [r0], r1              ; store op0
    vst1.u8     {q7}, [r0], r1              ; store oq0
    vst1.u8     {q8}, [r0], r1              ; store oq1

    ldmia       sp!, {pc}
    ENDP        ; |vp8_loop_filter_horizontal_edge_y_neon|

; void vp8_loop_filter_horizontal_edge_uv_neon(unsigned char *u, int pitch
;                                              const signed char *flimit,
;                                              const signed char *limit,
;                                              const signed char *thresh,
;                                              unsigned char *v)
; r0    unsigned char *u,
; r1    int pitch,
; r2    const signed char *flimit,
; r3    const signed char *limit,
; sp    const signed char *thresh,
; sp+4  unsigned char *v
|vp8_loop_filter_horizontal_edge_uv_neon| PROC
    stmdb       sp!, {lr}
    vld1.s8     {d0[], d1[]}, [r2]          ; flimit
    vld1.s8     {d2[], d3[]}, [r3]          ; limit
    ldr         r2, [sp, #8]                ; load v ptr

    sub         r3, r0, r1, lsl #2          ; move u pointer down by 4 lines
    vld1.u8     {d6}, [r3], r1              ; p3
    vld1.u8     {d8}, [r3], r1              ; p2
    vld1.u8     {d10}, [r3], r1             ; p1
    vld1.u8     {d12}, [r3], r1             ; p0
    vld1.u8     {d14}, [r3], r1             ; q0
    vld1.u8     {d16}, [r3], r1             ; q1
    vld1.u8     {d18}, [r3], r1             ; q2
    vld1.u8     {d20}, [r3]                 ; q3

    ldr         r3, [sp, #4]                ; load thresh pointer

    sub         r12, r2, r1, lsl #2         ; move v pointer down by 4 lines
    vld1.u8     {d7}, [r12], r1             ; p3
    vld1.u8     {d9}, [r12], r1             ; p2
    vld1.u8     {d11}, [r12], r1            ; p1
    vld1.u8     {d13}, [r12], r1            ; p0
    vld1.u8     {d15}, [r12], r1            ; q0
    vld1.u8     {d17}, [r12], r1            ; q1
    vld1.u8     {d19}, [r12], r1            ; q2
    vld1.u8     {d21}, [r12]                ; q3

    vld1.s8     {d4[], d5[]}, [r3]          ; thresh

    bl          vp8_loop_filter_neon

    sub         r0, r0, r1, lsl #1
    sub         r2, r2, r1, lsl #1

    vst1.u8     {d10}, [r0], r1             ; store u op1
    vst1.u8     {d11}, [r2], r1             ; store v op1
    vst1.u8     {d12}, [r0], r1             ; store u op0
    vst1.u8     {d13}, [r2], r1             ; store v op0
    vst1.u8     {d14}, [r0], r1             ; store u oq0
    vst1.u8     {d15}, [r2], r1             ; store v oq0
    vst1.u8     {d16}, [r0]                 ; store u oq1
    vst1.u8     {d17}, [r2]                 ; store v oq1

    ldmia       sp!, {pc}
    ENDP        ; |vp8_loop_filter_horizontal_edge_uv_neon|

; void vp8_loop_filter_vertical_edge_y_neon(unsigned char *src, int pitch,
;                                           const signed char *flimit,
;                                           const signed char *limit,
;                                           const signed char *thresh,
;                                           int count)
; r0    unsigned char *src,
; r1    int pitch,
; r2    const signed char *flimit,
; r3    const signed char *limit,
; sp    const signed char *thresh,
; sp+4  int count (unused)
|vp8_loop_filter_vertical_edge_y_neon| PROC
    stmdb       sp!, {lr}
    vld1.s8     {d0[], d1[]}, [r2]          ; flimit
    vld1.s8     {d2[], d3[]}, [r3]          ; limit
    sub         r2, r0, #4                  ; src ptr down by 4 columns
    sub         r0, r0, #2                  ; dst ptr
    ldr         r12, [sp, #4]               ; load thresh pointer

    vld1.u8     {d6}, [r2], r1              ; load first 8-line src data
    vld1.u8     {d8}, [r2], r1
    vld1.u8     {d10}, [r2], r1
    vld1.u8     {d12}, [r2], r1
    vld1.u8     {d14}, [r2], r1
    vld1.u8     {d16}, [r2], r1
    vld1.u8     {d18}, [r2], r1
    vld1.u8     {d20}, [r2], r1

    vld1.s8     {d4[], d5[]}, [r12]         ; thresh

    vld1.u8     {d7}, [r2], r1              ; load second 8-line src data
    vld1.u8     {d9}, [r2], r1
    vld1.u8     {d11}, [r2], r1
    vld1.u8     {d13}, [r2], r1
    vld1.u8     {d15}, [r2], r1
    vld1.u8     {d17}, [r2], r1
    vld1.u8     {d19}, [r2], r1
    vld1.u8     {d21}, [r2]

    ;transpose to 8x16 matrix
    vtrn.32     q3, q7
    vtrn.32     q4, q8
    vtrn.32     q5, q9
    vtrn.32     q6, q10

    vtrn.16     q3, q5
    vtrn.16     q4, q6
    vtrn.16     q7, q9
    vtrn.16     q8, q10

    vtrn.8      q3, q4
    vtrn.8      q5, q6
    vtrn.8      q7, q8
    vtrn.8      q9, q10

    bl          vp8_loop_filter_neon

    vswp        d12, d11
    vswp        d16, d13
    vswp        d14, d12
    vswp        d16, d15

    ;store op1, op0, oq0, oq1
    vst4.8      {d10[0], d11[0], d12[0], d13[0]}, [r0], r1
    vst4.8      {d10[1], d11[1], d12[1], d13[1]}, [r0], r1
    vst4.8      {d10[2], d11[2], d12[2], d13[2]}, [r0], r1
    vst4.8      {d10[3], d11[3], d12[3], d13[3]}, [r0], r1
    vst4.8      {d10[4], d11[4], d12[4], d13[4]}, [r0], r1
    vst4.8      {d10[5], d11[5], d12[5], d13[5]}, [r0], r1
    vst4.8      {d10[6], d11[6], d12[6], d13[6]}, [r0], r1
    vst4.8      {d10[7], d11[7], d12[7], d13[7]}, [r0], r1
    vst4.8      {d14[0], d15[0], d16[0], d17[0]}, [r0], r1
    vst4.8      {d14[1], d15[1], d16[1], d17[1]}, [r0], r1
    vst4.8      {d14[2], d15[2], d16[2], d17[2]}, [r0], r1
    vst4.8      {d14[3], d15[3], d16[3], d17[3]}, [r0], r1
    vst4.8      {d14[4], d15[4], d16[4], d17[4]}, [r0], r1
    vst4.8      {d14[5], d15[5], d16[5], d17[5]}, [r0], r1
    vst4.8      {d14[6], d15[6], d16[6], d17[6]}, [r0], r1
    vst4.8      {d14[7], d15[7], d16[7], d17[7]}, [r0]

    ldmia       sp!, {pc}
    ENDP        ; |vp8_loop_filter_vertical_edge_y_neon|

; void vp8_loop_filter_vertical_edge_uv_neon(unsigned char *u, int pitch
;                                            const signed char *flimit,
;                                            const signed char *limit,
;                                            const signed char *thresh,
;                                            unsigned char *v)
; r0    unsigned char *u,
; r1    int pitch,
; r2    const signed char *flimit,
; r3    const signed char *limit,
; sp    const signed char *thresh,
; sp+4  unsigned char *v
|vp8_loop_filter_vertical_edge_uv_neon| PROC
    stmdb       sp!, {lr}
    sub         r12, r0, #4                  ; move u pointer down by 4 columns
    vld1.s8     {d0[], d1[]}, [r2]          ; flimit
    vld1.s8     {d2[], d3[]}, [r3]          ; limit

    ldr         r2, [sp, #8]                ; load v ptr

    vld1.u8     {d6}, [r12], r1              ;load u data
    vld1.u8     {d8}, [r12], r1
    vld1.u8     {d10}, [r12], r1
    vld1.u8     {d12}, [r12], r1
    vld1.u8     {d14}, [r12], r1
    vld1.u8     {d16}, [r12], r1
    vld1.u8     {d18}, [r12], r1
    vld1.u8     {d20}, [r12]

    sub         r3, r2, #4                  ; move v pointer down by 4 columns
    vld1.u8     {d7}, [r3], r1              ;load v data
    vld1.u8     {d9}, [r3], r1
    vld1.u8     {d11}, [r3], r1
    vld1.u8     {d13}, [r3], r1
    vld1.u8     {d15}, [r3], r1
    vld1.u8     {d17}, [r3], r1
    vld1.u8     {d19}, [r3], r1
    vld1.u8     {d21}, [r3]

    ldr         r12, [sp, #4]               ; load thresh pointer

    ;transpose to 8x16 matrix
    vtrn.32     q3, q7
    vtrn.32     q4, q8
    vtrn.32     q5, q9
    vtrn.32     q6, q10

    vtrn.16     q3, q5
    vtrn.16     q4, q6
    vtrn.16     q7, q9
    vtrn.16     q8, q10

    vtrn.8      q3, q4
    vtrn.8      q5, q6
    vtrn.8      q7, q8
    vtrn.8      q9, q10

    vld1.s8     {d4[], d5[]}, [r12]         ; thresh

    bl          vp8_loop_filter_neon

    sub         r0, r0, #2
    sub         r2, r2, #2

    vswp        d12, d11
    vswp        d16, d13
    vswp        d14, d12
    vswp        d16, d15

    ;store op1, op0, oq0, oq1
    vst4.8      {d10[0], d11[0], d12[0], d13[0]}, [r0], r1
    vst4.8      {d14[0], d15[0], d16[0], d17[0]}, [r2], r1
    vst4.8      {d10[1], d11[1], d12[1], d13[1]}, [r0], r1
    vst4.8      {d14[1], d15[1], d16[1], d17[1]}, [r2], r1
    vst4.8      {d10[2], d11[2], d12[2], d13[2]}, [r0], r1
    vst4.8      {d14[2], d15[2], d16[2], d17[2]}, [r2], r1
    vst4.8      {d10[3], d11[3], d12[3], d13[3]}, [r0], r1
    vst4.8      {d14[3], d15[3], d16[3], d17[3]}, [r2], r1
    vst4.8      {d10[4], d11[4], d12[4], d13[4]}, [r0], r1
    vst4.8      {d14[4], d15[4], d16[4], d17[4]}, [r2], r1
    vst4.8      {d10[5], d11[5], d12[5], d13[5]}, [r0], r1
    vst4.8      {d14[5], d15[5], d16[5], d17[5]}, [r2], r1
    vst4.8      {d10[6], d11[6], d12[6], d13[6]}, [r0], r1
    vst4.8      {d14[6], d15[6], d16[6], d17[6]}, [r2], r1
    vst4.8      {d10[7], d11[7], d12[7], d13[7]}, [r0]
    vst4.8      {d14[7], d15[7], d16[7], d17[7]}, [r2]

    ldmia       sp!, {pc}
    ENDP        ; |vp8_loop_filter_vertical_edge_uv_neon|

; void vp8_loop_filter_neon();
; This is a helper function for the loopfilters. The invidual functions do the
; necessary load, transpose (if necessary) and store.

; r0-r3 PRESERVE
; q0    flimit
; q1    limit
; q2    thresh
; q3    p3
; q4    p2
; q5    p1
; q6    p0
; q7    q0
; q8    q1
; q9    q2
; q10   q3
|vp8_loop_filter_neon| PROC
    adr         r12, lf_coeff

    ; vp8_filter_mask
    vabd.u8     q11, q3, q4                 ; abs(p3 - p2)
    vabd.u8     q12, q4, q5                 ; abs(p2 - p1)
    vabd.u8     q13, q5, q6                 ; abs(p1 - p0)
    vabd.u8     q14, q8, q7                 ; abs(q1 - q0)
    vabd.u8     q3, q9, q8                  ; abs(q2 - q1)
    vabd.u8     q4, q10, q9                 ; abs(q3 - q2)
    vabd.u8     q9, q6, q7                  ; abs(p0 - q0)

    vmax.u8     q11, q11, q12
    vmax.u8     q12, q13, q14
    vmax.u8     q3, q3, q4
    vmax.u8     q15, q11, q12

    ; vp8_hevmask
    vcgt.u8     q13, q13, q2                ; (abs(p1 - p0) > thresh)*-1
    vcgt.u8     q14, q14, q2                ; (abs(q1 - q0) > thresh)*-1
    vmax.u8     q15, q15, q3

    vadd.u8     q0, q0, q0                  ; flimit * 2
    vadd.u8     q0, q0, q1                  ; flimit * 2 + limit
    vcge.u8     q15, q1, q15

    vabd.u8     q2, q5, q8                  ; a = abs(p1 - q1)
    vqadd.u8    q9, q9, q9                  ; b = abs(p0 - q0) * 2
    vshr.u8     q2, q2, #1                  ; a = a / 2
    vqadd.u8    q9, q9, q2                  ; a = b + a
    vcge.u8     q9, q0, q9                  ; (a > flimit * 2 + limit) * -1

    vld1.u8     {q0}, [r12]!

    ; vp8_filter() function
    ; convert to signed
    veor        q7, q7, q0                  ; qs0
    veor        q6, q6, q0                  ; ps0
    veor        q5, q5, q0                  ; ps1
    veor        q8, q8, q0                  ; qs1

    vld1.u8     {q10}, [r12]!

    vsubl.s8    q2, d14, d12                ; ( qs0 - ps0)
    vsubl.s8    q11, d15, d13

    vmovl.u8    q4, d20

    vqsub.s8    q1, q5, q8                  ; vp8_filter = clamp(ps1-qs1)
    vorr        q14, q13, q14               ; vp8_hevmask

    vmul.i16    q2, q2, q4                  ; 3 * ( qs0 - ps0)
    vmul.i16    q11, q11, q4

    vand        q1, q1, q14                 ; vp8_filter &= hev
    vand        q15, q15, q9                ; vp8_filter_mask

    vaddw.s8    q2, q2, d2
    vaddw.s8    q11, q11, d3

    vld1.u8     {q9}, [r12]!

    ; vp8_filter = clamp(vp8_filter + 3 * ( qs0 - ps0))
    vqmovn.s16  d2, q2
    vqmovn.s16  d3, q11
    vand        q1, q1, q15                 ; vp8_filter &= mask

    vqadd.s8    q2, q1, q10                 ; Filter2 = clamp(vp8_filter+3)
    vqadd.s8    q1, q1, q9                  ; Filter1 = clamp(vp8_filter+4)
    vshr.s8     q2, q2, #3                  ; Filter2 >>= 3
    vshr.s8     q1, q1, #3                  ; Filter1 >>= 3

    vqadd.s8    q11, q6, q2                 ; u = clamp(ps0 + Filter2)
    vqsub.s8    q10, q7, q1                 ; u = clamp(qs0 - Filter1)

    ; outer tap adjustments: ++vp8_filter >> 1
    vrshr.s8    q1, q1, #1
    vbic        q1, q1, q14                 ; vp8_filter &= ~hev

    vqadd.s8    q13, q5, q1                 ; u = clamp(ps1 + vp8_filter)
    vqsub.s8    q12, q8, q1                 ; u = clamp(qs1 - vp8_filter)

    veor        q5, q13, q0                 ; *op1 = u^0x80
    veor        q6, q11, q0                 ; *op0 = u^0x80
    veor        q7, q10, q0                 ; *oq0 = u^0x80
    veor        q8, q12, q0                 ; *oq1 = u^0x80

    bx          lr
    ENDP        ; |vp8_loop_filter_horizontal_edge_y_neon|

;-----------------

lf_coeff
    DCD     0x80808080, 0x80808080, 0x80808080, 0x80808080
    DCD     0x03030303, 0x03030303, 0x03030303, 0x03030303
    DCD     0x04040404, 0x04040404, 0x04040404, 0x04040404
    DCD     0x01010101, 0x01010101, 0x01010101, 0x01010101

    END