[erlang-questions] Binary pattern matching and optimization
Mon Nov 24 20:27:30 CET 2008
My thinking was that reading a big binary and then passing it
with offsets to various parsing functions would be easier on
the emulator than creating a new binary for each one. Is it
the case that the compiler will optimize away the creation of
On Mon, Nov 24, 2008 at 08:10:38PM +0100, Robert Virding wrote:
} The compiler and VM is smart and optimises the matching of a binary where
} the last segment is a binary. This makes it more efficient to use a binary
} like a list and pick things off the front.
} *BUT* for this to work the reference to the whole binary, Bin your case,
} must not be used after the match, then the compiler can reuse that binary
} reference and save work. You reuse Bin and the compiler is warning you that
} when you do this it can't do a good a job as possible.
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