I have a ton of debug calls in my code like the following.

&foo_debug ("<message>") if ($FOO_DEBUG_MODE);
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I am always qualifying the calls with an "if" to avoid the cost of a call/return pair. Is there anything else I can do to eliminate more of the performance overhead? A better method? BTW, I want the debug calls to be an execution time option. The program has a usage with a "-debug" option. Thanks!