Call me conservative after many years in this business but I say Yes. In my 
experience optimization sometimes exposes bugs that previously were masked. I 
have little experience with COBOL, but COBOL is notorious for allowing invalid 
constructs like array subscript over-cleverness.


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf 
Of Tom Marchant
Sent: Thursday, October 13, 2016 7:00 AM
Subject: Re: ABO Automatic Binary Optimizer

On Thu, 13 Oct 2016 05:44:51 -0500, Bill Woodger wrote:

>Recompiling a program with no changes. Do you "regression test"? No.


So, if someone compiles their COBOL program without optimization and tests it, 
then compiles it with optimization before putting it into production, does it 
need to be tested again?

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