This adds lots of extra .ifs, but speeds it up by a couple cycles,
by avoiding stalls.
This is cherrypicked from libav commit
b0806088d3b27044145b20421da8d39089ae0c6a.
---
libavcodec/aarch64/vp9lpf_neon.S | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/libavcodec/aarch64/vp9lpf_neon.S b/libavcodec/aarch64/vp9lpf_neon.S
index 7fe2c88..cd3e26c 100644
--- a/libavcodec/aarch64/vp9lpf_neon.S
+++ b/libavcodec/aarch64/vp9lpf_neon.S
@@ -338,20 +338,28 @@
uxtl_sz v0.8h, v1.8h, v22, \sz // p1
uxtl_sz v2.8h, v3.8h, v25, \sz // q1
+.if \wd >= 8
+ mov x5, v6.d[0]
+.ifc \sz, .16b
+ mov x6, v6.d[1]
+.endif
+.endif
saddw_sz v0.8h, v1.8h, v0.8h, v1.8h, \tmp3, \sz // p1 + f
ssubw_sz v2.8h, v3.8h, v2.8h, v3.8h, \tmp3, \sz // q1 - f
sqxtun_sz v0, v0.8h, v1.8h, \sz // out p1
sqxtun_sz v2, v2.8h, v3.8h, \sz // out q1
+.if \wd >= 8
+.ifc \sz, .16b
+ adds x5, x5, x6
+.endif
+.endif
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]
- adds x5, x5, x6
b.eq 6f
.else
cbz x5, 6f
--
2.7.4
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