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aarch64: vp9: use alternative returns in the core loop filter function 

Since aarch64 has enough free general purpose registers use them to
branch to the appropiate storage code. 1-2 cycles faster for the
functions using loop_filter 8/16, ... on a cortex-a53. Mixed results
(up to 2 cycles faster/slower) on a cortex-a57.

This is cherrypicked from libav commit
d7595de0b2.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Janne Grunau 2017-01-10 00:15:07 +02:00 committed by Michael Niedermayer
parent 3ac46a0a62
commit 62ea07d797
1 changed files with 18 additions and 30 deletions
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48
libavcodec/aarch64/vp9lpf_neon.S
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@ -410,15 +410,19 @@
.endif
// If no pixels needed flat8in nor flat8out, jump to a
// writeout of the inner 4 pixels
cbz x5, 7f
cbnz x5, 1f
br x14
1:
mov x5, v7.d[0]
.ifc \sz, .16b
mov x6, v7.d[1]
orr x5, x5, x6
.endif
// If no pixels need flat8out, jump to a writeout of the inner 6 pixels
cbz x5, 8f
cbnz x5, 1f
br x15
1:
// flat8out
// This writes all outputs into v2-v17 (skipping v6 and v16).
// If this part is skipped, the output is read from v21-v26 (which is the input
@ -549,35 +553,24 @@ endfunc
function vp9_loop_filter_8
loop_filter 8, .8b, 0, v16, v17, v18, v19, v28, v29, v30, v31
mov x5, #0
ret
6:
mov x5, #6
ret
br x13
9:
br x10
endfunc
function vp9_loop_filter_8_16b_mix
loop_filter 8, .16b, 88, v16, v17, v18, v19, v28, v29, v30, v31
mov x5, #0
ret
6:
mov x5, #6
ret
br x13
9:
br x10
endfunc
function vp9_loop_filter_16
loop_filter 16, .8b, 0, v8, v9, v10, v11, v12, v13, v14, v15
mov x5, #0
ret
7:
mov x5, #7
ret
8:
mov x5, #8
ret
9:
ldp d8, d9, [sp], 0x10
@ -589,13 +582,6 @@ endfunc
function vp9_loop_filter_16_16b
loop_filter 16, .16b, 0, v8, v9, v10, v11, v12, v13, v14, v15
mov x5, #0
ret
7:
mov x5, #7
ret
8:
mov x5, #8
ret
9:
ldp d8, d9, [sp], 0x10
@ -614,11 +600,14 @@ endfunc
.endm
.macro loop_filter_8
// calculate alternative 'return' targets
adr x13, 6f
bl vp9_loop_filter_8
cbnz x5, 6f
.endm
.macro loop_filter_8_16b_mix mix
// calculate alternative 'return' targets
adr x13, 6f
.if \mix == 48
mov x11, #0xffffffff00000000
.elseif \mix == 84
@ -627,21 +616,20 @@ endfunc
mov x11, #0xffffffffffffffff
.endif
bl vp9_loop_filter_8_16b_mix
cbnz x5, 6f
.endm
.macro loop_filter_16
// calculate alternative 'return' targets
adr x14, 7f
adr x15, 8f
bl vp9_loop_filter_16
cmp x5, 7
b.gt 8f
b.eq 7f
.endm
.macro loop_filter_16_16b
// calculate alternative 'return' targets
adr x14, 7f
adr x15, 8f
bl vp9_loop_filter_16_16b
cmp x5, 7
b.gt 8f
b.eq 7f
.endm