avcodec/x86/vp9lpf: add a comment above a bunch of SWAP.

62d31307 · Clément Bœsch · f0d368d7 · 62d31307
Commit 62d31307 authored Apr 20, 2014 by Clément Bœsch
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vp9lpf.asm libavcodec/x86/vp9lpf.asm +2 -0

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--- a/libavcodec/x86/vp9lpf.asm
+++ b/libavcodec/x86/vp9lpf.asm
@@ -419,6 +419,8 @@ SECTION .text
    mova               m14, [Q2]
    mova               m15, [Q3]
 %else
+    ; In case of horizontal, P3..Q3 are already present in some registers due
+    ; to the previous transpose, so we just swap registers.
    SWAP                 8,  4, 12
    SWAP                 9,  5, 13
    SWAP                10,  6, 14