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Commit a522be29 authored by Johann's avatar Johann Committed by Code Review
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Merge "fix armv6 simpleloop filter"

parents 6ea5bb85 467a0b99
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Showing with 47 additions and 68 deletions
vp8/common/arm/armv6/simpleloopfilter_v6.asm
View file @ a522be29
......@@ -63,23 +63,22 @@ pstep RN r1
;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
stmdb sp!, {r4 - r11, lr}
sub src, src, pstep, lsl #1 ; move src pointer down by 2 lines
ldr r12, [r3] ; limit
ldr r3, [src, -pstep, lsl #1] ; p1
ldr r12, [r3], #4 ; limit
ldr r3, [src], pstep ; p1
ldr r9, [sp, #40] ; count for 8-in-parallel
ldr r4, [src, -pstep] ; p0
ldr r9, [sp, #36] ; count for 8-in-parallel
ldr r4, [src], pstep ; p0
ldr r7, [r2], #4 ; flimit
ldr r5, [src], pstep ; q0
ldr r7, [r2] ; flimit
ldr r5, [src] ; q0
ldr r2, c0x80808080
ldr r6, [src] ; q1
ldr r6, [src, pstep] ; q1
uadd8 r7, r7, r7 ; flimit * 2
mov r9, r9, lsl #1 ; 4-in-parallel
mov r9, r9, lsl #1 ; double the count. we're doing 4 at a time
uadd8 r12, r7, r12 ; flimit * 2 + limit
mov lr, #0
|simple_hnext8|
; vp8_simple_filter_mask() function
......@@ -89,22 +88,19 @@ pstep RN r1
uqsub8 r10, r4, r5 ; p0 - q0
uqsub8 r11, r5, r4 ; q0 - p0
orr r8, r8, r7 ; abs(p1 - q1)
ldr lr, c0x7F7F7F7F ; 01111111 mask
orr r10, r10, r11 ; abs(p0 - q0)
and r8, lr, r8, lsr #1 ; abs(p1 - q1) / 2
uhadd8 r8, r8, lr ; abs(p1 - q2) >> 1
uqadd8 r10, r10, r10 ; abs(p0 - q0) * 2
mvn lr, #0 ; r10 == -1
; STALL waiting on r10
uqadd8 r10, r10, r8 ; abs(p0 - q0)*2 + abs(p1 - q1)/2
; STALL waiting on r10 :(
uqsub8 r10, r10, r12 ; compare to flimit
mov r8, #0
usub8 r10, r8, r10 ; use usub8 instead of ssub8
; STALL (maybe?) when are flags set? :/
sel r10, lr, r8 ; filter mask: lr
; STALL waiting on r10
mvn r8, #0
uqsub8 r10, r10, r12 ; compare to flimit. need to do this twice because uqsub8 doesn't set GE flags
; and usub8 doesn't saturate
usub8 r10, lr, r10 ; set GE flags for each byte
sel r10, r8, lr ; filter mask: F or 0
cmp r10, #0
beq simple_hskip_filter ; skip filtering
beq simple_hskip_filter ; skip filtering if we're &ing with 0s. would just write out the same values
;vp8_simple_filter() function
......@@ -113,55 +109,45 @@ pstep RN r1
eor r4, r4, r2 ; p0 offset to convert to a signed value
eor r5, r5, r2 ; q0 offset to convert to a signed value
qsub8 r3, r3, r6 ; vp8_filter (r3) = vp8_signed_char_clamp(p1-q1)
qsub8 r6, r5, r4 ; vp8_filter = vp8_signed_char_clamp(vp8_filter + 3 * ( q0 - p0))
qsub8 r3, r3, r6 ; vp8_signed_char_clamp(p1-q1)
qsub8 r6, r5, r4 ; vp8_signed_char_clamp(q0-p0)
qadd8 r3, r3, r6 ; += q0-p0
qadd8 r3, r3, r6 ; += q0-p0
qadd8 r3, r3, r6 ; p1-q1 + 3*(q0-p0))
and r3, r3, r10 ; &= mask
qadd8 r3, r3, r6
ldr r8, c0x03030303 ; r8 = 3
qadd8 r3, r3, r6
ldr r7, c0x04040404
qadd8 r3, r3, r6
and r3, r3, lr ; vp8_filter &= mask;
ldr r8, c0x03030303
;save bottom 3 bits so that we round one side +4 and the other +3
qadd8 r7 , r3 , r7 ; Filter1 (r3) = vp8_signed_char_clamp(vp8_filter+4)
qadd8 r8 , r3 , r8 ; Filter2 (r8) = vp8_signed_char_clamp(vp8_filter+3)
qadd8 r3 , r3 , r7 ; Filter1 (r3) = vp8_signed_char_clamp(vp8_filter+4)
mov r7, #0
shadd8 r8 , r8 , r7 ; Filter2 >>= 3
shadd8 r3 , r3 , r7 ; Filter1 >>= 3
shadd8 r8 , r8 , r7
shadd8 r3 , r3 , r7
shadd8 r8 , r8 , r7 ; r8: Filter2
shadd8 r3 , r3 , r7 ; r7: filter1
mov r3, #0
shadd8 r7 , r7 , r3
shadd8 r8 , r8 , r3
shadd8 r7 , r7 , r3
shadd8 r8 , r8 , r3
shadd8 r7 , r7 , r3 ; Filter1 >>= 3
shadd8 r8 , r8 , r3 ; Filter2 >>= 3
;calculate output
sub src, src, pstep, lsl #1
qsub8 r5 ,r5, r7 ; u = vp8_signed_char_clamp(q0 - Filter1)
qadd8 r4, r4, r8 ; u = vp8_signed_char_clamp(p0 + Filter2)
qsub8 r5 ,r5, r3 ; u = vp8_signed_char_clamp(q0 - Filter1)
eor r4, r4, r2 ; *op0 = u^0x80
str r4, [src], pstep ; store op0 result
eor r5, r5, r2 ; *oq0 = u^0x80
str r5, [src], pstep ; store oq0 result
str r5, [src] ; store oq0 result
eor r4, r4, r2 ; *op0 = u^0x80
str r4, [src, -pstep] ; store op0 result
|simple_hskip_filter|
add src, src, #4
sub src, src, pstep
sub src, src, pstep, lsl #1
subs r9, r9, #1
addne src, src, #4 ; next row
;pld [src]
;pld [src, pstep]
;pld [src, pstep, lsl #1]
ldrne r3, [src], pstep ; p1
ldrne r4, [src], pstep ; p0
ldrne r5, [src], pstep ; q0
ldrne r6, [src] ; q1
ldrne r3, [src, -pstep, lsl #1] ; p1
ldrne r4, [src, -pstep] ; p0
ldrne r5, [src] ; q0
ldrne r6, [src, pstep] ; q1
bne simple_hnext8
......@@ -174,9 +160,9 @@ pstep RN r1
;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
stmdb sp!, {r4 - r11, lr}
ldr r12, [r2], #4 ; r12: flimit
ldr r12, [r2] ; r12: flimit
ldr r2, c0x80808080
ldr r7, [r3], #4 ; limit
ldr r7, [r3] ; limit
; load soure data to r7, r8, r9, r10
ldrh r3, [src, #-2]
......@@ -213,16 +199,15 @@ pstep RN r1
uqsub8 r10, r5, r4 ; q0 - p0
orr r7, r7, r8 ; abs(p1 - q1)
orr r9, r9, r10 ; abs(p0 - q0)
ldr lr, c0x7F7F7F7F ; 0111 1111 mask
uqadd8 r9, r9, r9 ; abs(p0 - q0) * 2
and r7, lr, r7, lsr #1 ; abs(p1 - q1) / 2
mov r8, #0
uqadd8 r9, r9, r9 ; abs(p0 - q0) * 2
uhadd8 r7, r7, r8 ; abs(p1 - q1) / 2
uqadd8 r7, r7, r9 ; abs(p0 - q0)*2 + abs(p1 - q1)/2
mvn r10, #0 ; r10 == -1
uqsub8 r7, r7, r12 ; compare to flimit
usub8 r7, r8, r7
sel r7, r10, r8 ; filter mask: lr
sel lr, r10, r8 ; filter mask
cmp lr, #0
beq simple_vskip_filter ; skip filtering
......@@ -286,10 +271,6 @@ pstep RN r1
|simple_vskip_filter|
subs r11, r11, #1
;pld [src]
;pld [src, pstep]
;pld [src, pstep, lsl #1]
; load soure data to r7, r8, r9, r10
ldrneh r3, [src, #-2]
ldrneh r4, [src], pstep
......@@ -316,7 +297,5 @@ pstep RN r1
c0x80808080 DCD 0x80808080
c0x03030303 DCD 0x03030303
c0x04040404 DCD 0x04040404
c0x01010101 DCD 0x01010101
c0x7F7F7F7F DCD 0x7F7F7F7F
END
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