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Unified Diff: third_party/libvpx/source/libvpx/vp8/common/arm/armv6/loopfilter_v6.asm

Issue 1158913006: Move libvpx from DEPS to src (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: add DEPS file with #include paths Created 5 years, 7 months ago
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Index: third_party/libvpx/source/libvpx/vp8/common/arm/armv6/loopfilter_v6.asm
diff --git a/third_party/libvpx/source/libvpx/vp8/common/arm/armv6/loopfilter_v6.asm b/third_party/libvpx/source/libvpx/vp8/common/arm/armv6/loopfilter_v6.asm
new file mode 100644
index 0000000000000000000000000000000000000000..1cbbbcdef5e2533b43a7095b9588d07b474d939b
--- /dev/null
+++ b/third_party/libvpx/source/libvpx/vp8/common/arm/armv6/loopfilter_v6.asm
@@ -0,0 +1,1282 @@
+;
+; 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_armv6|
+ EXPORT |vp8_mbloop_filter_horizontal_edge_armv6|
+ EXPORT |vp8_loop_filter_vertical_edge_armv6|
+ EXPORT |vp8_mbloop_filter_vertical_edge_armv6|
+
+ AREA |.text|, CODE, READONLY ; name this block of code
+
+ MACRO
+ TRANSPOSE_MATRIX $a0, $a1, $a2, $a3, $b0, $b1, $b2, $b3
+ ; input: $a0, $a1, $a2, $a3; output: $b0, $b1, $b2, $b3
+ ; a0: 03 02 01 00
+ ; a1: 13 12 11 10
+ ; a2: 23 22 21 20
+ ; a3: 33 32 31 30
+ ; b3 b2 b1 b0
+
+ uxtb16 $b1, $a1 ; xx 12 xx 10
+ uxtb16 $b0, $a0 ; xx 02 xx 00
+ uxtb16 $b3, $a3 ; xx 32 xx 30
+ uxtb16 $b2, $a2 ; xx 22 xx 20
+ orr $b1, $b0, $b1, lsl #8 ; 12 02 10 00
+ orr $b3, $b2, $b3, lsl #8 ; 32 22 30 20
+
+ uxtb16 $a1, $a1, ror #8 ; xx 13 xx 11
+ uxtb16 $a3, $a3, ror #8 ; xx 33 xx 31
+ uxtb16 $a0, $a0, ror #8 ; xx 03 xx 01
+ uxtb16 $a2, $a2, ror #8 ; xx 23 xx 21
+ orr $a0, $a0, $a1, lsl #8 ; 13 03 11 01
+ orr $a2, $a2, $a3, lsl #8 ; 33 23 31 21
+
+ pkhtb $b2, $b3, $b1, asr #16 ; 32 22 12 02 -- p1
+ pkhbt $b0, $b1, $b3, lsl #16 ; 30 20 10 00 -- p3
+
+ pkhtb $b3, $a2, $a0, asr #16 ; 33 23 13 03 -- p0
+ pkhbt $b1, $a0, $a2, lsl #16 ; 31 21 11 01 -- p2
+ MEND
+
+
+src RN r0
+pstep RN r1
+count RN r5
+
+;r0 unsigned char *src_ptr,
+;r1 int src_pixel_step,
+;r2 const char *blimit,
+;r3 const char *limit,
+;stack const char *thresh,
+;stack int count
+
+;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+|vp8_loop_filter_horizontal_edge_armv6| PROC
+;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+ stmdb sp!, {r4 - r11, lr}
+
+ sub src, src, pstep, lsl #2 ; move src pointer down by 4 lines
+ ldr count, [sp, #40] ; count for 8-in-parallel
+ ldr r6, [sp, #36] ; load thresh address
+ sub sp, sp, #16 ; create temp buffer
+
+ ldr r9, [src], pstep ; p3
+ ldrb r4, [r2] ; blimit
+ ldr r10, [src], pstep ; p2
+ ldrb r2, [r3] ; limit
+ ldr r11, [src], pstep ; p1
+ orr r4, r4, r4, lsl #8
+ ldrb r3, [r6] ; thresh
+ orr r2, r2, r2, lsl #8
+ mov count, count, lsl #1 ; 4-in-parallel
+ orr r4, r4, r4, lsl #16
+ orr r3, r3, r3, lsl #8
+ orr r2, r2, r2, lsl #16
+ orr r3, r3, r3, lsl #16
+
+|Hnext8|
+ ; vp8_filter_mask() function
+ ; calculate breakout conditions
+ ldr r12, [src], pstep ; p0
+
+ uqsub8 r6, r9, r10 ; p3 - p2
+ uqsub8 r7, r10, r9 ; p2 - p3
+ uqsub8 r8, r10, r11 ; p2 - p1
+ uqsub8 r10, r11, r10 ; p1 - p2
+
+ orr r6, r6, r7 ; abs (p3-p2)
+ orr r8, r8, r10 ; abs (p2-p1)
+ uqsub8 lr, r6, r2 ; compare to limit. lr: vp8_filter_mask
+ uqsub8 r8, r8, r2 ; compare to limit
+ uqsub8 r6, r11, r12 ; p1 - p0
+ orr lr, lr, r8
+ uqsub8 r7, r12, r11 ; p0 - p1
+ ldr r9, [src], pstep ; q0
+ ldr r10, [src], pstep ; q1
+ orr r6, r6, r7 ; abs (p1-p0)
+ uqsub8 r7, r6, r2 ; compare to limit
+ uqsub8 r8, r6, r3 ; compare to thresh -- save r8 for later
+ orr lr, lr, r7
+
+ uqsub8 r6, r11, r10 ; p1 - q1
+ uqsub8 r7, r10, r11 ; q1 - p1
+ uqsub8 r11, r12, r9 ; p0 - q0
+ uqsub8 r12, r9, r12 ; q0 - p0
+ orr r6, r6, r7 ; abs (p1-q1)
+ ldr r7, c0x7F7F7F7F
+ orr r12, r11, r12 ; abs (p0-q0)
+ ldr r11, [src], pstep ; q2
+ uqadd8 r12, r12, r12 ; abs (p0-q0) * 2
+ and r6, r7, r6, lsr #1 ; abs (p1-q1) / 2
+ uqsub8 r7, r9, r10 ; q0 - q1
+ uqadd8 r12, r12, r6 ; abs (p0-q0)*2 + abs (p1-q1)/2
+ uqsub8 r6, r10, r9 ; q1 - q0
+ uqsub8 r12, r12, r4 ; compare to flimit
+ uqsub8 r9, r11, r10 ; q2 - q1
+
+ orr lr, lr, r12
+
+ ldr r12, [src], pstep ; q3
+ uqsub8 r10, r10, r11 ; q1 - q2
+ orr r6, r7, r6 ; abs (q1-q0)
+ orr r10, r9, r10 ; abs (q2-q1)
+ uqsub8 r7, r6, r2 ; compare to limit
+ uqsub8 r10, r10, r2 ; compare to limit
+ uqsub8 r6, r6, r3 ; compare to thresh -- save r6 for later
+ orr lr, lr, r7
+ orr lr, lr, r10
+
+ uqsub8 r10, r12, r11 ; q3 - q2
+ uqsub8 r9, r11, r12 ; q2 - q3
+
+ mvn r11, #0 ; r11 == -1
+
+ orr r10, r10, r9 ; abs (q3-q2)
+ uqsub8 r10, r10, r2 ; compare to limit
+
+ mov r12, #0
+ orr lr, lr, r10
+ sub src, src, pstep, lsl #2
+
+ usub8 lr, r12, lr ; use usub8 instead of ssub8
+ sel lr, r11, r12 ; filter mask: lr
+
+ cmp lr, #0
+ beq hskip_filter ; skip filtering
+
+ sub src, src, pstep, lsl #1 ; move src pointer down by 6 lines
+
+ ;vp8_hevmask() function
+ ;calculate high edge variance
+ orr r10, r6, r8 ; calculate vp8_hevmask
+
+ ldr r7, [src], pstep ; p1
+
+ usub8 r10, r12, r10 ; use usub8 instead of ssub8
+ sel r6, r12, r11 ; obtain vp8_hevmask: r6
+
+ ;vp8_filter() function
+ ldr r8, [src], pstep ; p0
+ ldr r12, c0x80808080
+ ldr r9, [src], pstep ; q0
+ ldr r10, [src], pstep ; q1
+
+ eor r7, r7, r12 ; p1 offset to convert to a signed value
+ eor r8, r8, r12 ; p0 offset to convert to a signed value
+ eor r9, r9, r12 ; q0 offset to convert to a signed value
+ eor r10, r10, r12 ; q1 offset to convert to a signed value
+
+ str r9, [sp] ; store qs0 temporarily
+ str r8, [sp, #4] ; store ps0 temporarily
+ str r10, [sp, #8] ; store qs1 temporarily
+ str r7, [sp, #12] ; store ps1 temporarily
+
+ qsub8 r7, r7, r10 ; vp8_signed_char_clamp(ps1-qs1)
+ qsub8 r8, r9, r8 ; vp8_signed_char_clamp(vp8_filter + 3 * ( qs0 - ps0))
+
+ and r7, r7, r6 ; vp8_filter (r7) &= hev
+
+ qadd8 r7, r7, r8
+ ldr r9, c0x03030303 ; r9 = 3 --modified for vp8
+
+ qadd8 r7, r7, r8
+ ldr r10, c0x04040404
+
+ qadd8 r7, r7, r8
+ and r7, r7, lr ; vp8_filter &= mask;
+
+ ;modify code for vp8 -- Filter1 = vp8_filter (r7)
+ qadd8 r8 , r7 , r9 ; Filter2 (r8) = vp8_signed_char_clamp(vp8_filter+3)
+ qadd8 r7 , r7 , r10 ; vp8_filter = vp8_signed_char_clamp(vp8_filter+4)
+
+ mov r9, #0
+ shadd8 r8 , r8 , r9 ; Filter2 >>= 3
+ shadd8 r7 , r7 , r9 ; vp8_filter >>= 3
+ shadd8 r8 , r8 , r9
+ shadd8 r7 , r7 , r9
+ shadd8 lr , r8 , r9 ; lr: Filter2
+ shadd8 r7 , r7 , r9 ; r7: filter
+
+ ;usub8 lr, r8, r10 ; s = (s==4)*-1
+ ;sel lr, r11, r9
+ ;usub8 r8, r10, r8
+ ;sel r8, r11, r9
+ ;and r8, r8, lr ; -1 for each element that equals 4
+
+ ;calculate output
+ ;qadd8 lr, r8, r7 ; u = vp8_signed_char_clamp(s + vp8_filter)
+
+ ldr r8, [sp] ; load qs0
+ ldr r9, [sp, #4] ; load ps0
+
+ ldr r10, c0x01010101
+
+ qsub8 r8 ,r8, r7 ; u = vp8_signed_char_clamp(qs0 - vp8_filter)
+ qadd8 r9, r9, lr ; u = vp8_signed_char_clamp(ps0 + Filter2)
+
+ ;end of modification for vp8
+
+ mov lr, #0
+ sadd8 r7, r7 , r10 ; vp8_filter += 1
+ shadd8 r7, r7, lr ; vp8_filter >>= 1
+
+ ldr r11, [sp, #12] ; load ps1
+ ldr r10, [sp, #8] ; load qs1
+
+ bic r7, r7, r6 ; vp8_filter &= ~hev
+ sub src, src, pstep, lsl #2
+
+ qadd8 r11, r11, r7 ; u = vp8_signed_char_clamp(ps1 + vp8_filter)
+ qsub8 r10, r10,r7 ; u = vp8_signed_char_clamp(qs1 - vp8_filter)
+
+ eor r11, r11, r12 ; *op1 = u^0x80
+ str r11, [src], pstep ; store op1
+ eor r9, r9, r12 ; *op0 = u^0x80
+ str r9, [src], pstep ; store op0 result
+ eor r8, r8, r12 ; *oq0 = u^0x80
+ str r8, [src], pstep ; store oq0 result
+ eor r10, r10, r12 ; *oq1 = u^0x80
+ str r10, [src], pstep ; store oq1
+
+ sub src, src, pstep, lsl #1
+
+|hskip_filter|
+ add src, src, #4
+ sub src, src, pstep, lsl #2
+
+ subs count, count, #1
+
+ ldrne r9, [src], pstep ; p3
+ ldrne r10, [src], pstep ; p2
+ ldrne r11, [src], pstep ; p1
+
+ bne Hnext8
+
+ add sp, sp, #16
+ ldmia sp!, {r4 - r11, pc}
+ ENDP ; |vp8_loop_filter_horizontal_edge_armv6|
+
+
+;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+|vp8_mbloop_filter_horizontal_edge_armv6| PROC
+;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+ stmdb sp!, {r4 - r11, lr}
+
+ sub src, src, pstep, lsl #2 ; move src pointer down by 4 lines
+ ldr count, [sp, #40] ; count for 8-in-parallel
+ ldr r6, [sp, #36] ; load thresh address
+ sub sp, sp, #16 ; create temp buffer
+
+ ldr r9, [src], pstep ; p3
+ ldrb r4, [r2] ; blimit
+ ldr r10, [src], pstep ; p2
+ ldrb r2, [r3] ; limit
+ ldr r11, [src], pstep ; p1
+ orr r4, r4, r4, lsl #8
+ ldrb r3, [r6] ; thresh
+ orr r2, r2, r2, lsl #8
+ mov count, count, lsl #1 ; 4-in-parallel
+ orr r4, r4, r4, lsl #16
+ orr r3, r3, r3, lsl #8
+ orr r2, r2, r2, lsl #16
+ orr r3, r3, r3, lsl #16
+
+|MBHnext8|
+
+ ; vp8_filter_mask() function
+ ; calculate breakout conditions
+ ldr r12, [src], pstep ; p0
+
+ uqsub8 r6, r9, r10 ; p3 - p2
+ uqsub8 r7, r10, r9 ; p2 - p3
+ uqsub8 r8, r10, r11 ; p2 - p1
+ uqsub8 r10, r11, r10 ; p1 - p2
+
+ orr r6, r6, r7 ; abs (p3-p2)
+ orr r8, r8, r10 ; abs (p2-p1)
+ uqsub8 lr, r6, r2 ; compare to limit. lr: vp8_filter_mask
+ uqsub8 r8, r8, r2 ; compare to limit
+
+ uqsub8 r6, r11, r12 ; p1 - p0
+ orr lr, lr, r8
+ uqsub8 r7, r12, r11 ; p0 - p1
+ ldr r9, [src], pstep ; q0
+ ldr r10, [src], pstep ; q1
+ orr r6, r6, r7 ; abs (p1-p0)
+ uqsub8 r7, r6, r2 ; compare to limit
+ uqsub8 r8, r6, r3 ; compare to thresh -- save r8 for later
+ orr lr, lr, r7
+
+ uqsub8 r6, r11, r10 ; p1 - q1
+ uqsub8 r7, r10, r11 ; q1 - p1
+ uqsub8 r11, r12, r9 ; p0 - q0
+ uqsub8 r12, r9, r12 ; q0 - p0
+ orr r6, r6, r7 ; abs (p1-q1)
+ ldr r7, c0x7F7F7F7F
+ orr r12, r11, r12 ; abs (p0-q0)
+ ldr r11, [src], pstep ; q2
+ uqadd8 r12, r12, r12 ; abs (p0-q0) * 2
+ and r6, r7, r6, lsr #1 ; abs (p1-q1) / 2
+ uqsub8 r7, r9, r10 ; q0 - q1
+ uqadd8 r12, r12, r6 ; abs (p0-q0)*2 + abs (p1-q1)/2
+ uqsub8 r6, r10, r9 ; q1 - q0
+ uqsub8 r12, r12, r4 ; compare to flimit
+ uqsub8 r9, r11, r10 ; q2 - q1
+
+ orr lr, lr, r12
+
+ ldr r12, [src], pstep ; q3
+
+ uqsub8 r10, r10, r11 ; q1 - q2
+ orr r6, r7, r6 ; abs (q1-q0)
+ orr r10, r9, r10 ; abs (q2-q1)
+ uqsub8 r7, r6, r2 ; compare to limit
+ uqsub8 r10, r10, r2 ; compare to limit
+ uqsub8 r6, r6, r3 ; compare to thresh -- save r6 for later
+ orr lr, lr, r7
+ orr lr, lr, r10
+
+ uqsub8 r10, r12, r11 ; q3 - q2
+ uqsub8 r9, r11, r12 ; q2 - q3
+
+ mvn r11, #0 ; r11 == -1
+
+ orr r10, r10, r9 ; abs (q3-q2)
+ uqsub8 r10, r10, r2 ; compare to limit
+
+ mov r12, #0
+
+ orr lr, lr, r10
+
+ usub8 lr, r12, lr ; use usub8 instead of ssub8
+ sel lr, r11, r12 ; filter mask: lr
+
+ cmp lr, #0
+ beq mbhskip_filter ; skip filtering
+
+ ;vp8_hevmask() function
+ ;calculate high edge variance
+ sub src, src, pstep, lsl #2 ; move src pointer down by 6 lines
+ sub src, src, pstep, lsl #1
+
+ orr r10, r6, r8
+ ldr r7, [src], pstep ; p1
+
+ usub8 r10, r12, r10
+ sel r6, r12, r11 ; hev mask: r6
+
+ ;vp8_mbfilter() function
+ ;p2, q2 are only needed at the end. Don't need to load them in now.
+ ldr r8, [src], pstep ; p0
+ ldr r12, c0x80808080
+ ldr r9, [src], pstep ; q0
+ ldr r10, [src] ; q1
+
+ eor r7, r7, r12 ; ps1
+ eor r8, r8, r12 ; ps0
+ eor r9, r9, r12 ; qs0
+ eor r10, r10, r12 ; qs1
+
+ qsub8 r12, r9, r8 ; vp8_signed_char_clamp(vp8_filter + 3 * ( qs0 - ps0))
+ str r7, [sp, #12] ; store ps1 temporarily
+ qsub8 r7, r7, r10 ; vp8_signed_char_clamp(ps1-qs1)
+ str r10, [sp, #8] ; store qs1 temporarily
+ qadd8 r7, r7, r12
+ str r9, [sp] ; store qs0 temporarily
+ qadd8 r7, r7, r12
+ str r8, [sp, #4] ; store ps0 temporarily
+ qadd8 r7, r7, r12 ; vp8_filter: r7
+
+ ldr r10, c0x03030303 ; r10 = 3 --modified for vp8
+ ldr r9, c0x04040404
+
+ and r7, r7, lr ; vp8_filter &= mask (lr is free)
+
+ mov r12, r7 ; Filter2: r12
+ and r12, r12, r6 ; Filter2 &= hev
+
+ ;modify code for vp8
+ ;save bottom 3 bits so that we round one side +4 and the other +3
+ qadd8 r8 , r12 , r9 ; Filter1 (r8) = vp8_signed_char_clamp(Filter2+4)
+ qadd8 r12 , r12 , r10 ; Filter2 (r12) = vp8_signed_char_clamp(Filter2+3)
+
+ mov r10, #0
+ shadd8 r8 , r8 , r10 ; Filter1 >>= 3
+ shadd8 r12 , r12 , r10 ; Filter2 >>= 3
+ shadd8 r8 , r8 , r10
+ shadd8 r12 , r12 , r10
+ shadd8 r8 , r8 , r10 ; r8: Filter1
+ shadd8 r12 , r12 , r10 ; r12: Filter2
+
+ ldr r9, [sp] ; load qs0
+ ldr r11, [sp, #4] ; load ps0
+
+ qsub8 r9 , r9, r8 ; qs0 = vp8_signed_char_clamp(qs0 - Filter1)
+ qadd8 r11, r11, r12 ; ps0 = vp8_signed_char_clamp(ps0 + Filter2)
+
+ ;save bottom 3 bits so that we round one side +4 and the other +3
+ ;and r8, r12, r10 ; s = Filter2 & 7 (s: r8)
+ ;qadd8 r12 , r12 , r9 ; Filter2 = vp8_signed_char_clamp(Filter2+4)
+ ;mov r10, #0
+ ;shadd8 r12 , r12 , r10 ; Filter2 >>= 3
+ ;usub8 lr, r8, r9 ; s = (s==4)*-1
+ ;sel lr, r11, r10
+ ;shadd8 r12 , r12 , r10
+ ;usub8 r8, r9, r8
+ ;sel r8, r11, r10
+ ;ldr r9, [sp] ; load qs0
+ ;ldr r11, [sp, #4] ; load ps0
+ ;shadd8 r12 , r12 , r10
+ ;and r8, r8, lr ; -1 for each element that equals 4
+ ;qadd8 r10, r8, r12 ; u = vp8_signed_char_clamp(s + Filter2)
+ ;qsub8 r9 , r9, r12 ; qs0 = vp8_signed_char_clamp(qs0 - Filter2)
+ ;qadd8 r11, r11, r10 ; ps0 = vp8_signed_char_clamp(ps0 + u)
+
+ ;end of modification for vp8
+
+ bic r12, r7, r6 ; vp8_filter &= ~hev ( r6 is free)
+ ;mov r12, r7
+
+ ;roughly 3/7th difference across boundary
+ mov lr, #0x1b ; 27
+ mov r7, #0x3f ; 63
+
+ sxtb16 r6, r12
+ sxtb16 r10, r12, ror #8
+ smlabb r8, r6, lr, r7
+ smlatb r6, r6, lr, r7
+ smlabb r7, r10, lr, r7
+ smultb r10, r10, lr
+ ssat r8, #8, r8, asr #7
+ ssat r6, #8, r6, asr #7
+ add r10, r10, #63
+ ssat r7, #8, r7, asr #7
+ ssat r10, #8, r10, asr #7
+
+ ldr lr, c0x80808080
+
+ pkhbt r6, r8, r6, lsl #16
+ pkhbt r10, r7, r10, lsl #16
+ uxtb16 r6, r6
+ uxtb16 r10, r10
+
+ sub src, src, pstep
+
+ orr r10, r6, r10, lsl #8 ; u = vp8_signed_char_clamp((63 + Filter2 * 27)>>7)
+
+ qsub8 r8, r9, r10 ; s = vp8_signed_char_clamp(qs0 - u)
+ qadd8 r10, r11, r10 ; s = vp8_signed_char_clamp(ps0 + u)
+ eor r8, r8, lr ; *oq0 = s^0x80
+ str r8, [src] ; store *oq0
+ sub src, src, pstep
+ eor r10, r10, lr ; *op0 = s^0x80
+ str r10, [src] ; store *op0
+
+ ;roughly 2/7th difference across boundary
+ mov lr, #0x12 ; 18
+ mov r7, #0x3f ; 63
+
+ sxtb16 r6, r12
+ sxtb16 r10, r12, ror #8
+ smlabb r8, r6, lr, r7
+ smlatb r6, r6, lr, r7
+ smlabb r9, r10, lr, r7
+ smlatb r10, r10, lr, r7
+ ssat r8, #8, r8, asr #7
+ ssat r6, #8, r6, asr #7
+ ssat r9, #8, r9, asr #7
+ ssat r10, #8, r10, asr #7
+
+ ldr lr, c0x80808080
+
+ pkhbt r6, r8, r6, lsl #16
+ pkhbt r10, r9, r10, lsl #16
+
+ ldr r9, [sp, #8] ; load qs1
+ ldr r11, [sp, #12] ; load ps1
+
+ uxtb16 r6, r6
+ uxtb16 r10, r10
+
+ sub src, src, pstep
+
+ orr r10, r6, r10, lsl #8 ; u = vp8_signed_char_clamp((63 + Filter2 * 18)>>7)
+
+ qadd8 r11, r11, r10 ; s = vp8_signed_char_clamp(ps1 + u)
+ qsub8 r8, r9, r10 ; s = vp8_signed_char_clamp(qs1 - u)
+ eor r11, r11, lr ; *op1 = s^0x80
+ str r11, [src], pstep ; store *op1
+ eor r8, r8, lr ; *oq1 = s^0x80
+ add src, src, pstep, lsl #1
+
+ mov r7, #0x3f ; 63
+
+ str r8, [src], pstep ; store *oq1
+
+ ;roughly 1/7th difference across boundary
+ mov lr, #0x9 ; 9
+ ldr r9, [src] ; load q2
+
+ sxtb16 r6, r12
+ sxtb16 r10, r12, ror #8
+ smlabb r8, r6, lr, r7
+ smlatb r6, r6, lr, r7
+ smlabb r12, r10, lr, r7
+ smlatb r10, r10, lr, r7
+ ssat r8, #8, r8, asr #7
+ ssat r6, #8, r6, asr #7
+ ssat r12, #8, r12, asr #7
+ ssat r10, #8, r10, asr #7
+
+ sub src, src, pstep, lsl #2
+
+ pkhbt r6, r8, r6, lsl #16
+ pkhbt r10, r12, r10, lsl #16
+
+ sub src, src, pstep
+ ldr lr, c0x80808080
+
+ ldr r11, [src] ; load p2
+
+ uxtb16 r6, r6
+ uxtb16 r10, r10
+
+ eor r9, r9, lr
+ eor r11, r11, lr
+
+ orr r10, r6, r10, lsl #8 ; u = vp8_signed_char_clamp((63 + Filter2 * 9)>>7)
+
+ qadd8 r8, r11, r10 ; s = vp8_signed_char_clamp(ps2 + u)
+ qsub8 r10, r9, r10 ; s = vp8_signed_char_clamp(qs2 - u)
+ eor r8, r8, lr ; *op2 = s^0x80
+ str r8, [src], pstep, lsl #2 ; store *op2
+ add src, src, pstep
+ eor r10, r10, lr ; *oq2 = s^0x80
+ str r10, [src], pstep, lsl #1 ; store *oq2
+
+|mbhskip_filter|
+ add src, src, #4
+ sub src, src, pstep, lsl #3
+ subs count, count, #1
+
+ ldrne r9, [src], pstep ; p3
+ ldrne r10, [src], pstep ; p2
+ ldrne r11, [src], pstep ; p1
+
+ bne MBHnext8
+
+ add sp, sp, #16
+ ldmia sp!, {r4 - r11, pc}
+ ENDP ; |vp8_mbloop_filter_horizontal_edge_armv6|
+
+
+;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+|vp8_loop_filter_vertical_edge_armv6| PROC
+;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+ stmdb sp!, {r4 - r11, lr}
+
+ sub src, src, #4 ; move src pointer down by 4
+ ldr count, [sp, #40] ; count for 8-in-parallel
+ ldr r12, [sp, #36] ; load thresh address
+ sub sp, sp, #16 ; create temp buffer
+
+ ldr r6, [src], pstep ; load source data
+ ldrb r4, [r2] ; blimit
+ ldr r7, [src], pstep
+ ldrb r2, [r3] ; limit
+ ldr r8, [src], pstep
+ orr r4, r4, r4, lsl #8
+ ldrb r3, [r12] ; thresh
+ orr r2, r2, r2, lsl #8
+ ldr lr, [src], pstep
+ mov count, count, lsl #1 ; 4-in-parallel
+ orr r4, r4, r4, lsl #16
+ orr r3, r3, r3, lsl #8
+ orr r2, r2, r2, lsl #16
+ orr r3, r3, r3, lsl #16
+
+|Vnext8|
+
+ ; vp8_filter_mask() function
+ ; calculate breakout conditions
+ ; transpose the source data for 4-in-parallel operation
+ TRANSPOSE_MATRIX r6, r7, r8, lr, r9, r10, r11, r12
+
+ uqsub8 r7, r9, r10 ; p3 - p2
+ uqsub8 r8, r10, r9 ; p2 - p3
+ uqsub8 r9, r10, r11 ; p2 - p1
+ uqsub8 r10, r11, r10 ; p1 - p2
+ orr r7, r7, r8 ; abs (p3-p2)
+ orr r10, r9, r10 ; abs (p2-p1)
+ uqsub8 lr, r7, r2 ; compare to limit. lr: vp8_filter_mask
+ uqsub8 r10, r10, r2 ; compare to limit
+
+ sub src, src, pstep, lsl #2 ; move src pointer down by 4 lines
+
+ orr lr, lr, r10
+
+ uqsub8 r6, r11, r12 ; p1 - p0
+ uqsub8 r7, r12, r11 ; p0 - p1
+ add src, src, #4 ; move src pointer up by 4
+ orr r6, r6, r7 ; abs (p1-p0)
+ str r11, [sp, #12] ; save p1
+ uqsub8 r10, r6, r2 ; compare to limit
+ uqsub8 r11, r6, r3 ; compare to thresh
+ orr lr, lr, r10
+
+ ; transpose uses 8 regs(r6 - r12 and lr). Need to save reg value now
+ ; transpose the source data for 4-in-parallel operation
+ ldr r6, [src], pstep ; load source data
+ str r11, [sp] ; push r11 to stack
+ ldr r7, [src], pstep
+ str r12, [sp, #4] ; save current reg before load q0 - q3 data
+ ldr r8, [src], pstep
+ str lr, [sp, #8]
+ ldr lr, [src], pstep
+
+ TRANSPOSE_MATRIX r6, r7, r8, lr, r9, r10, r11, r12
+
+ ldr lr, [sp, #8] ; load back (f)limit accumulator
+
+ uqsub8 r6, r12, r11 ; q3 - q2
+ uqsub8 r7, r11, r12 ; q2 - q3
+ uqsub8 r12, r11, r10 ; q2 - q1
+ uqsub8 r11, r10, r11 ; q1 - q2
+ orr r6, r6, r7 ; abs (q3-q2)
+ orr r7, r12, r11 ; abs (q2-q1)
+ uqsub8 r6, r6, r2 ; compare to limit
+ uqsub8 r7, r7, r2 ; compare to limit
+ ldr r11, [sp, #4] ; load back p0
+ ldr r12, [sp, #12] ; load back p1
+ orr lr, lr, r6
+ orr lr, lr, r7
+
+ uqsub8 r6, r11, r9 ; p0 - q0
+ uqsub8 r7, r9, r11 ; q0 - p0
+ uqsub8 r8, r12, r10 ; p1 - q1
+ uqsub8 r11, r10, r12 ; q1 - p1
+ orr r6, r6, r7 ; abs (p0-q0)
+ ldr r7, c0x7F7F7F7F
+ orr r8, r8, r11 ; abs (p1-q1)
+ uqadd8 r6, r6, r6 ; abs (p0-q0) * 2
+ and r8, r7, r8, lsr #1 ; abs (p1-q1) / 2
+ uqsub8 r11, r10, r9 ; q1 - q0
+ uqadd8 r6, r8, r6 ; abs (p0-q0)*2 + abs (p1-q1)/2
+ uqsub8 r12, r9, r10 ; q0 - q1
+ uqsub8 r6, r6, r4 ; compare to flimit
+
+ orr r9, r11, r12 ; abs (q1-q0)
+ uqsub8 r8, r9, r2 ; compare to limit
+ uqsub8 r10, r9, r3 ; compare to thresh
+ orr lr, lr, r6
+ orr lr, lr, r8
+
+ mvn r11, #0 ; r11 == -1
+ mov r12, #0
+
+ usub8 lr, r12, lr
+ ldr r9, [sp] ; load the compared result
+ sel lr, r11, r12 ; filter mask: lr
+
+ cmp lr, #0
+ beq vskip_filter ; skip filtering
+
+ ;vp8_hevmask() function
+ ;calculate high edge variance
+
+ sub src, src, pstep, lsl #2 ; move src pointer down by 4 lines
+
+ orr r9, r9, r10
+
+ ldrh r7, [src, #-2]
+ ldrh r8, [src], pstep
+
+ usub8 r9, r12, r9
+ sel r6, r12, r11 ; hev mask: r6
+
+ ;vp8_filter() function
+ ; load soure data to r6, r11, r12, lr
+ ldrh r9, [src, #-2]
+ ldrh r10, [src], pstep
+
+ pkhbt r12, r7, r8, lsl #16
+
+ ldrh r7, [src, #-2]
+ ldrh r8, [src], pstep
+
+ pkhbt r11, r9, r10, lsl #16
+
+ ldrh r9, [src, #-2]
+ ldrh r10, [src], pstep
+
+ ; Transpose needs 8 regs(r6 - r12, and lr). Save r6 and lr first
+ str r6, [sp]
+ str lr, [sp, #4]
+
+ pkhbt r6, r7, r8, lsl #16
+ pkhbt lr, r9, r10, lsl #16
+
+ ;transpose r12, r11, r6, lr to r7, r8, r9, r10
+ TRANSPOSE_MATRIX r12, r11, r6, lr, r7, r8, r9, r10
+
+ ;load back hev_mask r6 and filter_mask lr
+ ldr r12, c0x80808080
+ ldr r6, [sp]
+ ldr lr, [sp, #4]
+
+ eor r7, r7, r12 ; p1 offset to convert to a signed value
+ eor r8, r8, r12 ; p0 offset to convert to a signed value
+ eor r9, r9, r12 ; q0 offset to convert to a signed value
+ eor r10, r10, r12 ; q1 offset to convert to a signed value
+
+ str r9, [sp] ; store qs0 temporarily
+ str r8, [sp, #4] ; store ps0 temporarily
+ str r10, [sp, #8] ; store qs1 temporarily
+ str r7, [sp, #12] ; store ps1 temporarily
+
+ qsub8 r7, r7, r10 ; vp8_signed_char_clamp(ps1-qs1)
+ qsub8 r8, r9, r8 ; vp8_signed_char_clamp(vp8_filter + 3 * ( qs0 - ps0))
+
+ and r7, r7, r6 ; vp8_filter (r7) &= hev (r7 : filter)
+
+ qadd8 r7, r7, r8
+ ldr r9, c0x03030303 ; r9 = 3 --modified for vp8
+
+ qadd8 r7, r7, r8
+ ldr r10, c0x04040404
+
+ qadd8 r7, r7, r8
+ ;mvn r11, #0 ; r11 == -1
+
+ and r7, r7, lr ; vp8_filter &= mask
+
+ ;modify code for vp8 -- Filter1 = vp8_filter (r7)
+ qadd8 r8 , r7 , r9 ; Filter2 (r8) = vp8_signed_char_clamp(vp8_filter+3)
+ qadd8 r7 , r7 , r10 ; vp8_filter = vp8_signed_char_clamp(vp8_filter+4)
+
+ mov r9, #0
+ shadd8 r8 , r8 , r9 ; Filter2 >>= 3
+ shadd8 r7 , r7 , r9 ; vp8_filter >>= 3
+ shadd8 r8 , r8 , r9
+ shadd8 r7 , r7 , r9
+ shadd8 lr , r8 , r9 ; lr: filter2
+ shadd8 r7 , r7 , r9 ; r7: filter
+
+ ;usub8 lr, r8, r10 ; s = (s==4)*-1
+ ;sel lr, r11, r9
+ ;usub8 r8, r10, r8
+ ;sel r8, r11, r9
+ ;and r8, r8, lr ; -1 for each element that equals 4 -- r8: s
+
+ ;calculate output
+ ;qadd8 lr, r8, r7 ; u = vp8_signed_char_clamp(s + vp8_filter)
+
+ ldr r8, [sp] ; load qs0
+ ldr r9, [sp, #4] ; load ps0
+
+ ldr r10, c0x01010101
+
+ qsub8 r8, r8, r7 ; u = vp8_signed_char_clamp(qs0 - vp8_filter)
+ qadd8 r9, r9, lr ; u = vp8_signed_char_clamp(ps0 + Filter2)
+ ;end of modification for vp8
+
+ eor r8, r8, r12
+ eor r9, r9, r12
+
+ mov lr, #0
+
+ sadd8 r7, r7, r10
+ shadd8 r7, r7, lr
+
+ ldr r10, [sp, #8] ; load qs1
+ ldr r11, [sp, #12] ; load ps1
+
+ bic r7, r7, r6 ; r7: vp8_filter
+
+ qsub8 r10 , r10, r7 ; u = vp8_signed_char_clamp(qs1 - vp8_filter)
+ qadd8 r11, r11, r7 ; u = vp8_signed_char_clamp(ps1 + vp8_filter)
+ eor r10, r10, r12
+ eor r11, r11, r12
+
+ sub src, src, pstep, lsl #2
+
+ ;we can use TRANSPOSE_MATRIX macro to transpose output - input: q1, q0, p0, p1
+ ;output is b0, b1, b2, b3
+ ;b0: 03 02 01 00
+ ;b1: 13 12 11 10
+ ;b2: 23 22 21 20
+ ;b3: 33 32 31 30
+ ; p1 p0 q0 q1
+ ; (a3 a2 a1 a0)
+ TRANSPOSE_MATRIX r11, r9, r8, r10, r6, r7, r12, lr
+
+ strh r6, [src, #-2] ; store the result
+ mov r6, r6, lsr #16
+ strh r6, [src], pstep
+
+ strh r7, [src, #-2]
+ mov r7, r7, lsr #16
+ strh r7, [src], pstep
+
+ strh r12, [src, #-2]
+ mov r12, r12, lsr #16
+ strh r12, [src], pstep
+
+ strh lr, [src, #-2]
+ mov lr, lr, lsr #16
+ strh lr, [src], pstep
+
+|vskip_filter|
+ sub src, src, #4
+ subs count, count, #1
+
+ ldrne r6, [src], pstep ; load source data
+ ldrne r7, [src], pstep
+ ldrne r8, [src], pstep
+ ldrne lr, [src], pstep
+
+ bne Vnext8
+
+ add sp, sp, #16
+
+ ldmia sp!, {r4 - r11, pc}
+ ENDP ; |vp8_loop_filter_vertical_edge_armv6|
+
+
+
+;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+|vp8_mbloop_filter_vertical_edge_armv6| PROC
+;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+ stmdb sp!, {r4 - r11, lr}
+
+ sub src, src, #4 ; move src pointer down by 4
+ ldr count, [sp, #40] ; count for 8-in-parallel
+ ldr r12, [sp, #36] ; load thresh address
+ pld [src, #23] ; preload for next block
+ sub sp, sp, #16 ; create temp buffer
+
+ ldr r6, [src], pstep ; load source data
+ ldrb r4, [r2] ; blimit
+ pld [src, #23]
+ ldr r7, [src], pstep
+ ldrb r2, [r3] ; limit
+ pld [src, #23]
+ ldr r8, [src], pstep
+ orr r4, r4, r4, lsl #8
+ ldrb r3, [r12] ; thresh
+ orr r2, r2, r2, lsl #8
+ pld [src, #23]
+ ldr lr, [src], pstep
+ mov count, count, lsl #1 ; 4-in-parallel
+ orr r4, r4, r4, lsl #16
+ orr r3, r3, r3, lsl #8
+ orr r2, r2, r2, lsl #16
+ orr r3, r3, r3, lsl #16
+
+|MBVnext8|
+ ; vp8_filter_mask() function
+ ; calculate breakout conditions
+ ; transpose the source data for 4-in-parallel operation
+ TRANSPOSE_MATRIX r6, r7, r8, lr, r9, r10, r11, r12
+
+ uqsub8 r7, r9, r10 ; p3 - p2
+ uqsub8 r8, r10, r9 ; p2 - p3
+ uqsub8 r9, r10, r11 ; p2 - p1
+ uqsub8 r10, r11, r10 ; p1 - p2
+ orr r7, r7, r8 ; abs (p3-p2)
+ orr r10, r9, r10 ; abs (p2-p1)
+ uqsub8 lr, r7, r2 ; compare to limit. lr: vp8_filter_mask
+ uqsub8 r10, r10, r2 ; compare to limit
+
+ sub src, src, pstep, lsl #2 ; move src pointer down by 4 lines
+
+ orr lr, lr, r10
+
+ uqsub8 r6, r11, r12 ; p1 - p0
+ uqsub8 r7, r12, r11 ; p0 - p1
+ add src, src, #4 ; move src pointer up by 4
+ orr r6, r6, r7 ; abs (p1-p0)
+ str r11, [sp, #12] ; save p1
+ uqsub8 r10, r6, r2 ; compare to limit
+ uqsub8 r11, r6, r3 ; compare to thresh
+ orr lr, lr, r10
+
+ ; transpose uses 8 regs(r6 - r12 and lr). Need to save reg value now
+ ; transpose the source data for 4-in-parallel operation
+ ldr r6, [src], pstep ; load source data
+ str r11, [sp] ; push r11 to stack
+ ldr r7, [src], pstep
+ str r12, [sp, #4] ; save current reg before load q0 - q3 data
+ ldr r8, [src], pstep
+ str lr, [sp, #8]
+ ldr lr, [src], pstep
+
+
+ TRANSPOSE_MATRIX r6, r7, r8, lr, r9, r10, r11, r12
+
+ ldr lr, [sp, #8] ; load back (f)limit accumulator
+
+ uqsub8 r6, r12, r11 ; q3 - q2
+ uqsub8 r7, r11, r12 ; q2 - q3
+ uqsub8 r12, r11, r10 ; q2 - q1
+ uqsub8 r11, r10, r11 ; q1 - q2
+ orr r6, r6, r7 ; abs (q3-q2)
+ orr r7, r12, r11 ; abs (q2-q1)
+ uqsub8 r6, r6, r2 ; compare to limit
+ uqsub8 r7, r7, r2 ; compare to limit
+ ldr r11, [sp, #4] ; load back p0
+ ldr r12, [sp, #12] ; load back p1
+ orr lr, lr, r6
+ orr lr, lr, r7
+
+ uqsub8 r6, r11, r9 ; p0 - q0
+ uqsub8 r7, r9, r11 ; q0 - p0
+ uqsub8 r8, r12, r10 ; p1 - q1
+ uqsub8 r11, r10, r12 ; q1 - p1
+ orr r6, r6, r7 ; abs (p0-q0)
+ ldr r7, c0x7F7F7F7F
+ orr r8, r8, r11 ; abs (p1-q1)
+ uqadd8 r6, r6, r6 ; abs (p0-q0) * 2
+ and r8, r7, r8, lsr #1 ; abs (p1-q1) / 2
+ uqsub8 r11, r10, r9 ; q1 - q0
+ uqadd8 r6, r8, r6 ; abs (p0-q0)*2 + abs (p1-q1)/2
+ uqsub8 r12, r9, r10 ; q0 - q1
+ uqsub8 r6, r6, r4 ; compare to flimit
+
+ orr r9, r11, r12 ; abs (q1-q0)
+ uqsub8 r8, r9, r2 ; compare to limit
+ uqsub8 r10, r9, r3 ; compare to thresh
+ orr lr, lr, r6
+ orr lr, lr, r8
+
+ mvn r11, #0 ; r11 == -1
+ mov r12, #0
+
+ usub8 lr, r12, lr
+ ldr r9, [sp] ; load the compared result
+ sel lr, r11, r12 ; filter mask: lr
+
+ cmp lr, #0
+ beq mbvskip_filter ; skip filtering
+
+
+
+ ;vp8_hevmask() function
+ ;calculate high edge variance
+
+ sub src, src, pstep, lsl #2 ; move src pointer down by 4 lines
+
+ orr r9, r9, r10
+
+ ldrh r7, [src, #-2]
+ ldrh r8, [src], pstep
+
+ usub8 r9, r12, r9
+ sel r6, r12, r11 ; hev mask: r6
+
+
+ ; vp8_mbfilter() function
+ ; p2, q2 are only needed at the end. Don't need to load them in now.
+ ; Transpose needs 8 regs(r6 - r12, and lr). Save r6 and lr first
+ ; load soure data to r6, r11, r12, lr
+ ldrh r9, [src, #-2]
+ ldrh r10, [src], pstep
+
+ pkhbt r12, r7, r8, lsl #16
+
+ ldrh r7, [src, #-2]
+ ldrh r8, [src], pstep
+
+ pkhbt r11, r9, r10, lsl #16
+
+ ldrh r9, [src, #-2]
+ ldrh r10, [src], pstep
+
+ str r6, [sp] ; save r6
+ str lr, [sp, #4] ; save lr
+
+ pkhbt r6, r7, r8, lsl #16
+ pkhbt lr, r9, r10, lsl #16
+
+ ;transpose r12, r11, r6, lr to p1, p0, q0, q1
+ TRANSPOSE_MATRIX r12, r11, r6, lr, r7, r8, r9, r10
+
+ ;load back hev_mask r6 and filter_mask lr
+ ldr r12, c0x80808080
+ ldr r6, [sp]
+ ldr lr, [sp, #4]
+
+ eor r7, r7, r12 ; ps1
+ eor r8, r8, r12 ; ps0
+ eor r9, r9, r12 ; qs0
+ eor r10, r10, r12 ; qs1
+
+ qsub8 r12, r9, r8 ; vp8_signed_char_clamp(vp8_filter + 3 * ( qs0 - ps0))
+ str r7, [sp, #12] ; store ps1 temporarily
+ qsub8 r7, r7, r10 ; vp8_signed_char_clamp(ps1-qs1)
+ str r10, [sp, #8] ; store qs1 temporarily
+ qadd8 r7, r7, r12
+ str r9, [sp] ; store qs0 temporarily
+ qadd8 r7, r7, r12
+ str r8, [sp, #4] ; store ps0 temporarily
+ qadd8 r7, r7, r12 ; vp8_filter: r7
+
+ ldr r10, c0x03030303 ; r10 = 3 --modified for vp8
+ ldr r9, c0x04040404
+ ;mvn r11, #0 ; r11 == -1
+
+ and r7, r7, lr ; vp8_filter &= mask (lr is free)
+
+ mov r12, r7 ; Filter2: r12
+ and r12, r12, r6 ; Filter2 &= hev
+
+ ;modify code for vp8
+ ;save bottom 3 bits so that we round one side +4 and the other +3
+ qadd8 r8 , r12 , r9 ; Filter1 (r8) = vp8_signed_char_clamp(Filter2+4)
+ qadd8 r12 , r12 , r10 ; Filter2 (r12) = vp8_signed_char_clamp(Filter2+3)
+
+ mov r10, #0
+ shadd8 r8 , r8 , r10 ; Filter1 >>= 3
+ shadd8 r12 , r12 , r10 ; Filter2 >>= 3
+ shadd8 r8 , r8 , r10
+ shadd8 r12 , r12 , r10
+ shadd8 r8 , r8 , r10 ; r8: Filter1
+ shadd8 r12 , r12 , r10 ; r12: Filter2
+
+ ldr r9, [sp] ; load qs0
+ ldr r11, [sp, #4] ; load ps0
+
+ qsub8 r9 , r9, r8 ; qs0 = vp8_signed_char_clamp(qs0 - Filter1)
+ qadd8 r11, r11, r12 ; ps0 = vp8_signed_char_clamp(ps0 + Filter2)
+
+ ;save bottom 3 bits so that we round one side +4 and the other +3
+ ;and r8, r12, r10 ; s = Filter2 & 7 (s: r8)
+ ;qadd8 r12 , r12 , r9 ; Filter2 = vp8_signed_char_clamp(Filter2+4)
+ ;mov r10, #0
+ ;shadd8 r12 , r12 , r10 ; Filter2 >>= 3
+ ;usub8 lr, r8, r9 ; s = (s==4)*-1
+ ;sel lr, r11, r10
+ ;shadd8 r12 , r12 , r10
+ ;usub8 r8, r9, r8
+ ;sel r8, r11, r10
+ ;ldr r9, [sp] ; load qs0
+ ;ldr r11, [sp, #4] ; load ps0
+ ;shadd8 r12 , r12 , r10
+ ;and r8, r8, lr ; -1 for each element that equals 4
+ ;qadd8 r10, r8, r12 ; u = vp8_signed_char_clamp(s + Filter2)
+ ;qsub8 r9 , r9, r12 ; qs0 = vp8_signed_char_clamp(qs0 - Filter2)
+ ;qadd8 r11, r11, r10 ; ps0 = vp8_signed_char_clamp(ps0 + u)
+
+ ;end of modification for vp8
+
+ bic r12, r7, r6 ;vp8_filter &= ~hev ( r6 is free)
+ ;mov r12, r7
+
+ ;roughly 3/7th difference across boundary
+ mov lr, #0x1b ; 27
+ mov r7, #0x3f ; 63
+
+ sxtb16 r6, r12
+ sxtb16 r10, r12, ror #8
+ smlabb r8, r6, lr, r7
+ smlatb r6, r6, lr, r7
+ smlabb r7, r10, lr, r7
+ smultb r10, r10, lr
+ ssat r8, #8, r8, asr #7
+ ssat r6, #8, r6, asr #7
+ add r10, r10, #63
+ ssat r7, #8, r7, asr #7
+ ssat r10, #8, r10, asr #7
+
+ ldr lr, c0x80808080
+
+ pkhbt r6, r8, r6, lsl #16
+ pkhbt r10, r7, r10, lsl #16
+ uxtb16 r6, r6
+ uxtb16 r10, r10
+
+ sub src, src, pstep, lsl #2 ; move src pointer down by 4 lines
+
+ orr r10, r6, r10, lsl #8 ; u = vp8_signed_char_clamp((63 + Filter2 * 27)>>7)
+
+ qsub8 r8, r9, r10 ; s = vp8_signed_char_clamp(qs0 - u)
+ qadd8 r10, r11, r10 ; s = vp8_signed_char_clamp(ps0 + u)
+ eor r8, r8, lr ; *oq0 = s^0x80
+ eor r10, r10, lr ; *op0 = s^0x80
+
+ strb r10, [src, #-1] ; store op0 result
+ strb r8, [src], pstep ; store oq0 result
+ mov r10, r10, lsr #8
+ mov r8, r8, lsr #8
+ strb r10, [src, #-1]
+ strb r8, [src], pstep
+ mov r10, r10, lsr #8
+ mov r8, r8, lsr #8
+ strb r10, [src, #-1]
+ strb r8, [src], pstep
+ mov r10, r10, lsr #8
+ mov r8, r8, lsr #8
+ strb r10, [src, #-1]
+ strb r8, [src], pstep
+
+ ;roughly 2/7th difference across boundary
+ mov lr, #0x12 ; 18
+ mov r7, #0x3f ; 63
+
+ sxtb16 r6, r12
+ sxtb16 r10, r12, ror #8
+ smlabb r8, r6, lr, r7
+ smlatb r6, r6, lr, r7
+ smlabb r9, r10, lr, r7
+
+ smlatb r10, r10, lr, r7
+ ssat r8, #8, r8, asr #7
+ ssat r6, #8, r6, asr #7
+ ssat r9, #8, r9, asr #7
+ ssat r10, #8, r10, asr #7
+
+ sub src, src, pstep, lsl #2 ; move src pointer down by 4 lines
+
+ pkhbt r6, r8, r6, lsl #16
+ pkhbt r10, r9, r10, lsl #16
+
+ ldr r9, [sp, #8] ; load qs1
+ ldr r11, [sp, #12] ; load ps1
+ ldr lr, c0x80808080
+
+ uxtb16 r6, r6
+ uxtb16 r10, r10
+
+ add src, src, #2
+
+ orr r10, r6, r10, lsl #8 ; u = vp8_signed_char_clamp((63 + Filter2 * 18)>>7)
+
+ qsub8 r8, r9, r10 ; s = vp8_signed_char_clamp(qs1 - u)
+ qadd8 r10, r11, r10 ; s = vp8_signed_char_clamp(ps1 + u)
+ eor r8, r8, lr ; *oq1 = s^0x80
+ eor r10, r10, lr ; *op1 = s^0x80
+
+ ldrb r11, [src, #-5] ; load p2 for 1/7th difference across boundary
+ strb r10, [src, #-4] ; store op1
+ strb r8, [src, #-1] ; store oq1
+ ldrb r9, [src], pstep ; load q2 for 1/7th difference across boundary
+
+ mov r10, r10, lsr #8
+ mov r8, r8, lsr #8
+
+ ldrb r6, [src, #-5]
+ strb r10, [src, #-4]
+ strb r8, [src, #-1]
+ ldrb r7, [src], pstep
+
+ mov r10, r10, lsr #8
+ mov r8, r8, lsr #8
+ orr r11, r11, r6, lsl #8
+ orr r9, r9, r7, lsl #8
+
+ ldrb r6, [src, #-5]
+ strb r10, [src, #-4]
+ strb r8, [src, #-1]
+ ldrb r7, [src], pstep
+
+ mov r10, r10, lsr #8
+ mov r8, r8, lsr #8
+ orr r11, r11, r6, lsl #16
+ orr r9, r9, r7, lsl #16
+
+ ldrb r6, [src, #-5]
+ strb r10, [src, #-4]
+ strb r8, [src, #-1]
+ ldrb r7, [src], pstep
+ orr r11, r11, r6, lsl #24
+ orr r9, r9, r7, lsl #24
+
+ ;roughly 1/7th difference across boundary
+ eor r9, r9, lr
+ eor r11, r11, lr
+
+ mov lr, #0x9 ; 9
+ mov r7, #0x3f ; 63
+
+ sxtb16 r6, r12
+ sxtb16 r10, r12, ror #8
+ smlabb r8, r6, lr, r7
+ smlatb r6, r6, lr, r7
+ smlabb r12, r10, lr, r7
+ smlatb r10, r10, lr, r7
+ ssat r8, #8, r8, asr #7
+ ssat r6, #8, r6, asr #7
+ ssat r12, #8, r12, asr #7
+ ssat r10, #8, r10, asr #7
+
+ sub src, src, pstep, lsl #2
+
+ pkhbt r6, r8, r6, lsl #16
+ pkhbt r10, r12, r10, lsl #16
+
+ uxtb16 r6, r6
+ uxtb16 r10, r10
+
+ ldr lr, c0x80808080
+
+ orr r10, r6, r10, lsl #8 ; u = vp8_signed_char_clamp((63 + Filter2 * 9)>>7)
+
+ qadd8 r8, r11, r10 ; s = vp8_signed_char_clamp(ps2 + u)
+ qsub8 r10, r9, r10 ; s = vp8_signed_char_clamp(qs2 - u)
+ eor r8, r8, lr ; *op2 = s^0x80
+ eor r10, r10, lr ; *oq2 = s^0x80
+
+ strb r8, [src, #-5] ; store *op2
+ strb r10, [src], pstep ; store *oq2
+ mov r8, r8, lsr #8
+ mov r10, r10, lsr #8
+ strb r8, [src, #-5]
+ strb r10, [src], pstep
+ mov r8, r8, lsr #8
+ mov r10, r10, lsr #8
+ strb r8, [src, #-5]
+ strb r10, [src], pstep
+ mov r8, r8, lsr #8
+ mov r10, r10, lsr #8
+ strb r8, [src, #-5]
+ strb r10, [src], pstep
+
+ ;adjust src pointer for next loop
+ sub src, src, #2
+
+|mbvskip_filter|
+ sub src, src, #4
+ subs count, count, #1
+
+ pld [src, #23] ; preload for next block
+ ldrne r6, [src], pstep ; load source data
+ pld [src, #23]
+ ldrne r7, [src], pstep
+ pld [src, #23]
+ ldrne r8, [src], pstep
+ pld [src, #23]
+ ldrne lr, [src], pstep
+
+ bne MBVnext8
+
+ add sp, sp, #16
+
+ ldmia sp!, {r4 - r11, pc}
+ ENDP ; |vp8_mbloop_filter_vertical_edge_armv6|
+
+; Constant Pool
+c0x80808080 DCD 0x80808080
+c0x03030303 DCD 0x03030303
+c0x04040404 DCD 0x04040404
+c0x01010101 DCD 0x01010101
+c0x7F7F7F7F DCD 0x7F7F7F7F
+
+ END
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