;
;  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_mbloop_filter_horizontal_edge_y_neon|
    EXPORT  |vp8_mbloop_filter_horizontal_edge_uv_neon|
    EXPORT  |vp8_mbloop_filter_vertical_edge_y_neon|
    EXPORT  |vp8_mbloop_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_mbloop_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_mbloop_filter_horizontal_edge_y_neon| PROC
    stmdb       sp!, {lr}
    sub         r0, r0, r1, lsl #2          ; move src pointer down by 4 lines
    ldr         r12, [sp, #4]               ; load thresh pointer

    vld1.u8     {q3}, [r0], r1              ; p3
    vld1.s8     {d2[], d3[]}, [r3]          ; limit
    vld1.u8     {q4}, [r0], r1              ; p2
    vld1.s8     {d4[], d5[]}, [r12]         ; thresh
    vld1.u8     {q5}, [r0], r1              ; p1
    vld1.u8     {q6}, [r0], r1              ; p0
    vld1.u8     {q7}, [r0], r1              ; q0
    vld1.u8     {q8}, [r0], r1              ; q1
    vld1.u8     {q9}, [r0], r1              ; q2
    vld1.u8     {q10}, [r0], r1             ; q3

    bl          vp8_mbloop_filter_neon

    sub         r0, r0, r1, lsl #3
    add         r0, r0, r1
    add         r2, r0, r1
    add         r3, r2, r1

    vst1.u8     {q4}, [r0]                  ; store op2
    vst1.u8     {q5}, [r2]                  ; store op1
    vst1.u8     {q6}, [r3], r1              ; store op0
    add         r12, r3, r1
    vst1.u8     {q7}, [r3]                  ; store oq0
    vst1.u8     {q8}, [r12], r1             ; store oq1
    vst1.u8     {q9}, [r12]             ; store oq2

    ldmia       sp!, {pc}
    ENDP        ; |vp8_mbloop_filter_horizontal_edge_y_neon|

; void vp8_mbloop_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_mbloop_filter_horizontal_edge_uv_neon| PROC
    stmdb       sp!, {lr}
    sub         r0, r0, r1, lsl #2          ; move u pointer down by 4 lines
    vld1.s8     {d2[], d3[]}, [r3]          ; limit
    ldr         r3, [sp, #8]                ; load v ptr
    ldr         r12, [sp, #4]               ; load thresh pointer
    sub         r3, r3, r1, lsl #2          ; move v pointer down by 4 lines

    vld1.u8     {d6}, [r0], r1              ; p3
    vld1.u8     {d7}, [r3], r1              ; p3
    vld1.u8     {d8}, [r0], r1              ; p2
    vld1.u8     {d9}, [r3], r1              ; p2
    vld1.u8     {d10}, [r0], r1             ; p1
    vld1.u8     {d11}, [r3], r1             ; p1
    vld1.u8     {d12}, [r0], r1             ; p0
    vld1.u8     {d13}, [r3], r1             ; p0
    vld1.u8     {d14}, [r0], r1             ; q0
    vld1.u8     {d15}, [r3], r1             ; q0
    vld1.u8     {d16}, [r0], r1             ; q1
    vld1.u8     {d17}, [r3], r1             ; q1
    vld1.u8     {d18}, [r0], r1             ; q2
    vld1.u8     {d19}, [r3], r1             ; q2
    vld1.u8     {d20}, [r0], r1             ; q3
    vld1.u8     {d21}, [r3], r1             ; q3

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

    bl          vp8_mbloop_filter_neon

    sub         r0, r0, r1, lsl #3
    sub         r3, r3, r1, lsl #3

    add         r0, r0, r1
    add         r3, r3, r1

    vst1.u8     {d8}, [r0], r1              ; store u op2
    vst1.u8     {d9}, [r3], r1              ; store v op2
    vst1.u8     {d10}, [r0], r1             ; store u op1
    vst1.u8     {d11}, [r3], r1             ; store v op1
    vst1.u8     {d12}, [r0], r1             ; store u op0
    vst1.u8     {d13}, [r3], r1             ; store v op0
    vst1.u8     {d14}, [r0], r1             ; store u oq0
    vst1.u8     {d15}, [r3], r1             ; store v oq0
    vst1.u8     {d16}, [r0], r1             ; store u oq1
    vst1.u8     {d17}, [r3], r1             ; store v oq1
    vst1.u8     {d18}, [r0], r1             ; store u oq2
    vst1.u8     {d19}, [r3], r1             ; store v oq2

    ldmia       sp!, {pc}
    ENDP        ; |vp8_mbloop_filter_horizontal_edge_uv_neon|

; void vp8_mbloop_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_mbloop_filter_vertical_edge_y_neon| PROC
    stmdb       sp!, {lr}
    sub         r0, r0, #4                  ; move src pointer down by 4 columns

    vld1.u8     {d6}, [r0], r1              ; load first 8-line src data
    ldr         r12, [sp, #4]               ; load thresh pointer
    vld1.u8     {d8}, [r0], r1
    sub         sp, sp, #32
    vld1.u8     {d10}, [r0], r1
    vld1.u8     {d12}, [r0], r1
    vld1.u8     {d14}, [r0], r1
    vld1.u8     {d16}, [r0], r1
    vld1.u8     {d18}, [r0], r1
    vld1.u8     {d20}, [r0], r1

    vld1.u8     {d7}, [r0], r1              ; load second 8-line src data
    vld1.u8     {d9}, [r0], r1
    vld1.u8     {d11}, [r0], r1
    vld1.u8     {d13}, [r0], r1
    vld1.u8     {d15}, [r0], r1
    vld1.u8     {d17}, [r0], r1
    vld1.u8     {d19}, [r0], r1
    vld1.u8     {d21}, [r0], r1

    ;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
    vld1.s8     {d2[], d3[]}, [r3]          ; limit
    mov         r12, sp
    vst1.u8     {q3}, [r12]!
    vst1.u8     {q10}, [r12]!

    bl          vp8_mbloop_filter_neon

    sub         r0, r0, r1, lsl #4

    add         r2, r0, r1

    add         r3, r2, r1

    vld1.u8     {q3}, [sp]!
    vld1.u8     {q10}, [sp]!

    ;transpose to 16x8 matrix
    vtrn.32     q3, q7
    vtrn.32     q4, q8
    vtrn.32     q5, q9
    vtrn.32     q6, q10
    add         r12, r3, r1

    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

    ;store op2, op1, op0, oq0, oq1, oq2
    vst1.8      {d6}, [r0]
    vst1.8      {d8}, [r2]
    vst1.8      {d10}, [r3]
    vst1.8      {d12}, [r12], r1
    add         r0, r12, r1
    vst1.8      {d14}, [r12]
    vst1.8      {d16}, [r0], r1
    add         r2, r0, r1
    vst1.8      {d18}, [r0]
    vst1.8      {d20}, [r2], r1
    add         r3, r2, r1
    vst1.8      {d7}, [r2]
    vst1.8      {d9}, [r3], r1
    add         r12, r3, r1
    vst1.8      {d11}, [r3]
    vst1.8      {d13}, [r12], r1
    add         r0, r12, r1
    vst1.8      {d15}, [r12]
    vst1.8      {d17}, [r0], r1
    add         r2, r0, r1
    vst1.8      {d19}, [r0]
    vst1.8      {d21}, [r2]

    ldmia       sp!, {pc}
    ENDP        ; |vp8_mbloop_filter_vertical_edge_y_neon|

; void vp8_mbloop_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_mbloop_filter_vertical_edge_uv_neon| PROC
    stmdb       sp!, {lr}
    sub         r0, r0, #4                  ; move src pointer down by 4 columns
    vld1.s8     {d2[], d3[]}, [r3]          ; limit
    ldr         r3, [sp, #8]                ; load v ptr
    ldr         r12, [sp, #4]               ; load thresh pointer

    sub         r3, r3, #4                  ; move v pointer down by 4 columns

    vld1.u8     {d6}, [r0], r1              ;load u data
    vld1.u8     {d7}, [r3], r1              ;load v data
    vld1.u8     {d8}, [r0], r1
    vld1.u8     {d9}, [r3], r1
    vld1.u8     {d10}, [r0], r1
    vld1.u8     {d11}, [r3], r1
    vld1.u8     {d12}, [r0], r1
    vld1.u8     {d13}, [r3], r1
    vld1.u8     {d14}, [r0], r1
    vld1.u8     {d15}, [r3], r1
    vld1.u8     {d16}, [r0], r1
    vld1.u8     {d17}, [r3], r1
    vld1.u8     {d18}, [r0], r1
    vld1.u8     {d19}, [r3], r1
    vld1.u8     {d20}, [r0], r1
    vld1.u8     {d21}, [r3], r1

    ;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

    sub         sp, sp, #32
    vld1.s8     {d4[], d5[]}, [r12]         ; thresh
    mov         r12, sp
    vst1.u8     {q3}, [r12]!
    vst1.u8     {q10}, [r12]!

    bl          vp8_mbloop_filter_neon

    sub         r0, r0, r1, lsl #3
    sub         r3, r3, r1, lsl #3

    vld1.u8     {q3}, [sp]!
    vld1.u8     {q10}, [sp]!

    ;transpose to 16x8 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

    ;store op2, op1, op0, oq0, oq1, oq2
    vst1.8      {d6}, [r0], r1
    vst1.8      {d7}, [r3], r1
    vst1.8      {d8}, [r0], r1
    vst1.8      {d9}, [r3], r1
    vst1.8      {d10}, [r0], r1
    vst1.8      {d11}, [r3], r1
    vst1.8      {d12}, [r0], r1
    vst1.8      {d13}, [r3], r1
    vst1.8      {d14}, [r0], r1
    vst1.8      {d15}, [r3], r1
    vst1.8      {d16}, [r0], r1
    vst1.8      {d17}, [r3], r1
    vst1.8      {d18}, [r0], r1
    vst1.8      {d19}, [r3], r1
    vst1.8      {d20}, [r0], r1
    vst1.8      {d21}, [r3], r1

    ldmia       sp!, {pc}
    ENDP        ; |vp8_mbloop_filter_vertical_edge_uv_neon|

; void vp8_mbloop_filter_neon()
; This is a helper function for the macroblock loopfilters. The individual
; functions do the necessary load, transpose (if necessary), preserve (if
; necessary) and store.

; TODO:
; The vertical filter writes p3/q3 back out because two 4 element writes are
; much simpler than ordering and writing two 3 element sets (or three 2 elements
; sets, or whichever other combinations are possible).
; If we can preserve q3 and q10, the vertical filter will be able to avoid
; storing those values on the stack and reading them back after the filter.

; r0,r1 PRESERVE
; r2    flimit
; r3    PRESERVE
; q1    limit
; q2    thresh
; q3    p3
; q4    p2
; q5    p1
; q6    p0
; q7    q0
; q8    q1
; q9    q2
; q10   q3

|vp8_mbloop_filter_neon| PROC
    ldr         r12, _mblf_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     q0, q10, q9                 ; abs(q3 - q2)

    vmax.u8     q11, q11, q12
    vmax.u8     q12, q13, q14
    vmax.u8     q3, q3, q0
    vmax.u8     q15, q11, q12

    vabd.u8     q12, q6, q7                 ; abs(p0 - q0)

    ; 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

    vld1.s8     {d4[], d5[]}, [r2]          ; flimit

    vld1.u8     {q0}, [r12]!

    vadd.u8     q2, q2, q2                  ; flimit * 2
    vadd.u8     q2, q2, q1                  ; flimit * 2 +  limit
    vcge.u8     q15, q1, q15

    vabd.u8     q1, q5, q8                  ; a = abs(p1 - q1)
    vqadd.u8    q12, q12, q12               ; b = abs(p0 - q0) * 2
    vshr.u8     q1, q1, #1                  ; a = a / 2
    vqadd.u8    q12, q12, q1                ; a = b + a
    vcge.u8     q12, q2, q12                ; (a > flimit * 2 + limit) * -1

    ; vp8_filter
    ; convert to signed
    veor        q7, q7, q0                  ; qs0
    veor        q6, q6, q0                  ; ps0
    veor        q5, q5, q0                  ; ps1
    veor        q8, q8, q0                  ; qs1
    veor        q4, q4, q0                  ; ps2
    veor        q9, q9, q0                  ; qs2

    vorr        q14, q13, q14               ; vp8_hevmask

    vsubl.s8    q2, d14, d12                ; qs0 - ps0
    vsubl.s8    q13, d15, d13

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

    vadd.s16    q10, q2, q2                 ; 3 * (qs0 - ps0)
    vadd.s16    q11, q13, q13
    vand        q15, q15, q12               ; vp8_filter_mask

    vadd.s16    q2, q2, q10
    vadd.s16    q13, q13, q11

    vld1.u8     {q12}, [r12]!               ; #3

    vaddw.s8    q2, q2, d2                  ; vp8_filter + 3 * ( qs0 - ps0)
    vaddw.s8    q13, q13, d3

    vld1.u8     {q11}, [r12]!               ; #4

    ; vp8_filter = clamp(vp8_filter + 3 * ( qs0 - ps0))
    vqmovn.s16  d2, q2
    vqmovn.s16  d3, q13

    vand        q1, q1, q15                 ; vp8_filter &= mask

    vld1.u8     {q15}, [r12]!               ; #63
    ;
    vand        q13, q1, q14                ; Filter2 &= hev

    vld1.u8     {d7}, [r12]!                ; #9

    vqadd.s8    q2, q13, q11                ; Filter1 = clamp(Filter2+4)
    vqadd.s8    q13, q13, q12               ; Filter2 = clamp(Filter2+3)

    vld1.u8     {d6}, [r12]!                ; #18

    vshr.s8     q2, q2, #3                  ; Filter1 >>= 3
    vshr.s8     q13, q13, #3                ; Filter2 >>= 3

    vmov        q10, q15
    vmov        q12, q15

    vqsub.s8    q7, q7, q2                  ; qs0 = clamp(qs0 - Filter1)

    vld1.u8     {d5}, [r12]!                ; #27

    vqadd.s8    q6, q6, q13                 ; ps0 = clamp(ps0 + Filter2)

    vbic        q1, q1, q14                 ; vp8_filter &= ~hev

    ; roughly 1/7th difference across boundary
    ; roughly 2/7th difference across boundary
    ; roughly 3/7th difference across boundary
    vmov        q11, q15
    vmov        q13, q15
    vmov        q14, q15

    vmlal.s8    q10, d2, d7                 ; Filter2 * 9
    vmlal.s8    q11, d3, d7
    vmlal.s8    q12, d2, d6                 ; Filter2 * 18
    vmlal.s8    q13, d3, d6
    vmlal.s8    q14, d2, d5                 ; Filter2 * 27
    vmlal.s8    q15, d3, d5
    vqshrn.s16  d20, q10, #7                ; u = clamp((63 + Filter2 * 9)>>7)
    vqshrn.s16  d21, q11, #7
    vqshrn.s16  d24, q12, #7                ; u = clamp((63 + Filter2 * 18)>>7)
    vqshrn.s16  d25, q13, #7
    vqshrn.s16  d28, q14, #7                ; u = clamp((63 + Filter2 * 27)>>7)
    vqshrn.s16  d29, q15, #7

    vqsub.s8    q11, q9, q10                ; s = clamp(qs2 - u)
    vqadd.s8    q10, q4, q10                ; s = clamp(ps2 + u)
    vqsub.s8    q13, q8, q12                ; s = clamp(qs1 - u)
    vqadd.s8    q12, q5, q12                ; s = clamp(ps1 + u)
    vqsub.s8    q15, q7, q14                ; s = clamp(qs0 - u)
    vqadd.s8    q14, q6, q14                ; s = clamp(ps0 + u)
    veor        q9, q11, q0                 ; *oq2 = s^0x80
    veor        q4, q10, q0                 ; *op2 = s^0x80
    veor        q8, q13, q0                 ; *oq1 = s^0x80
    veor        q5, q12, q0                 ; *op2 = s^0x80
    veor        q7, q15, q0                 ; *oq0 = s^0x80
    veor        q6, q14, q0                 ; *op0 = s^0x80

    bx          lr
    ENDP        ; |vp8_mbloop_filter_neon|

    AREA    mbloopfilter_dat, DATA, READONLY
_mblf_coeff_
    DCD     mblf_coeff
mblf_coeff
    DCD     0x80808080, 0x80808080, 0x80808080, 0x80808080
    DCD     0x03030303, 0x03030303, 0x03030303, 0x03030303
    DCD     0x04040404, 0x04040404, 0x04040404, 0x04040404
    DCD     0x003f003f, 0x003f003f, 0x003f003f, 0x003f003f
    DCD     0x09090909, 0x09090909, 0x12121212, 0x12121212
    DCD     0x1b1b1b1b, 0x1b1b1b1b

    END