When to do inline expansion

jhall@whale.WPI.EDU (John Clinton Hall)
Tue, 14 Sep 1993 17:34:39 GMT

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When to do inline expansion jhall@whale.WPI.EDU (1993-09-14)
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Newsgroups: comp.compilers
From: jhall@whale.WPI.EDU (John Clinton Hall)
Keywords: optimize, question
Organization: Worcester Polytechnic Institute
Date: Tue, 14 Sep 1993 17:34:39 GMT

How long should a function be (in number of statements) for it to be a
reasonable speed optimization to perform inline expansion? (For
simplicity, let's assume that the function is only called once
throughout the code, and the source language is C.) Obviously, a
function with 100 statements should not be expanded; however, a
function with only 1 statement should be expanded inline.


My guess is that executing 3 to 5 statements would equal the time it
would normally take to set up the call, perform the call, and clean up
after the call. Comments?
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jhall@wpi.wpi.edu
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