Missing peephole optimizations in parser, compiler
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Key: JRUBY-2917
URL: http://jira.codehaus.org/browse/JRUBY-2917
Project: JRuby
Issue Type: Bug
Components: Compiler, Interpreter, Parser
Reporter: Charles Oliver Nutter
There appears to be a number of peephole optimizations we could add that may
not add up to a lot of improvement, but could be useful under some
circumstances. For example, a few I know of (Marcin may know more):
* Bare literals on a line are not executed
* Repeated retrievals of the same local variable with no intervening code are
reduced to a single retrieval or not executed at all
* Repeated retrievals of an instance variable with no intervening code are
reduced to a single retrieval
All of these tend to confound benchmarking, but they may also be easy for us to
add to reduce (slightly) overhead in cases of badly-written code.
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