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aarch64: vp9: loop filter: replace 'orr; cbn?z' with 'adds; b.{eq,ne}; 

The latter is 1 cycle faster on a cortex-53 and since the operands are
bytewise (or larger) bitmask (impossible to overflow to zero) both are
equivalent.

This is cherrypicked from libav commit
e7ae8f7a71.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Janne Grunau 2017-01-10 00:15:08 +02:00 committed by Michael Niedermayer
parent 62ea07d797
commit cb220eeef9
1 changed files with 20 additions and 11 deletions
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31
libavcodec/aarch64/vp9lpf_neon.S
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@ -218,13 +218,15 @@
xtn_sz v5, v6.8h, v7.8h, \sz
and v4\sz, v4\sz, v5\sz // fm
// If no pixels need filtering, just exit as soon as possible
mov x5, v4.d[0]
.ifc \sz, .16b
mov x6, v4.d[1]
orr x5, x5, x6
.endif
// If no pixels need filtering, just exit as soon as possible
adds x5, x5, x6
b.eq 9f
.else
cbz x5, 9f
.endif
.if \wd >= 8
movi v0\sz, #1
@ -344,15 +346,17 @@
bit v22\sz, v0\sz, v5\sz // if (!hev && fm && !flat8in)
bit v25\sz, v2\sz, v5\sz
// If no pixels need flat8in, jump to flat8out
// (or to a writeout of the inner 4 pixels, for wd=8)
.if \wd >= 8
mov x5, v6.d[0]
.ifc \sz, .16b
mov x6, v6.d[1]
orr x5, x5, x6
.endif
// If no pixels need flat8in, jump to flat8out
// (or to a writeout of the inner 4 pixels, for wd=8)
adds x5, x5, x6
b.eq 6f
.else
cbz x5, 6f
.endif
// flat8in
uaddl_sz \tmp1\().8h, \tmp2\().8h, v20, v21, \sz
@ -406,20 +410,25 @@
mov x5, v2.d[0]
.ifc \sz, .16b
mov x6, v2.d[1]
orr x5, x5, x6
adds x5, x5, x6
b.ne 1f
.else
cbnz x5, 1f
.endif
// If no pixels needed flat8in nor flat8out, jump to a
// writeout of the inner 4 pixels
cbnz x5, 1f
br x14
1:
mov x5, v7.d[0]
.ifc \sz, .16b
mov x6, v7.d[1]
orr x5, x5, x6
adds x5, x5, x6
b.ne 1f
.else
cbnz x5, 1f
.endif
// If no pixels need flat8out, jump to a writeout of the inner 6 pixels
cbnz x5, 1f
br x15
1: