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-rw-r--r--doc/snow.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/snow.txt b/doc/snow.txt
index c3e16ebc1c..12377e6db9 100644
--- a/doc/snow.txt
+++ b/doc/snow.txt
@@ -323,6 +323,10 @@ snows 9/7 Integer filter:
/ | \|/ | \|/ | \|/ | \|/
| + | + | + | + +3/2
+optimization tips:
+following are exactly identical
+(3a)>>1 == a + (a>>1)
+(a + 4b + 8)>>4 == ((a>>2) + b + 2)>>2
TODO:
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