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Author SHA1 Message Date
Russ Cox
c6ce44822c cmd/gc: faster code, mainly for rotate
* Eliminate bounds check on known small shifts.
* Rewrite x<<s | x>>(32-s) as a rotate (constant s).
* More aggressive (but still minimal) range analysis.

R=ken, dave, iant
CC=golang-dev
https://golang.org/cl/6209077
2012-05-24 17:20:07 -04:00