shithub: dav1d

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arm64: mc: Reduce the width of a register copy

Only copy as much as really is needed/used.

--- a/src/arm/64/mc.S

+++ b/src/arm/64/mc.S

@@ -2073,9 +2073,9 @@

         st1             {v3.4h}, [\ds2], \d_strd

 .endif

         b.le            0f

-        mov             v16.16b, v18.16b

-        mov             v17.16b, v28.16b

-        mov             v18.16b, v29.16b

+        mov             v16.8b,  v18.8b

+        mov             v17.8b,  v28.8b

+        mov             v18.8b,  v29.8b

         b               4b

 480:    // 4x8, 4x16, 4x32 hv