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Re: warnings shut off in ov.cc?

From: John W. Eaton
Subject: Re: warnings shut off in ov.cc?
Date: Wed, 16 Oct 2019 15:47:43 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0

On 10/15/19 9:15 PM, Rik wrote:

It is possible to detect that a warning has been issued and avoid constant
folding, although the mechanism is clumsy.  This diff does it

Thanks for the patch. I made a similar change but used an unwind_protect object and did the same for array objects. I checked it in here:


To benchmark things, I created this function


So a 2% slowdown to add warning detection, but a 15% slowdown if constant
folding is removed altogether.  Although, let's be real, even if constant
folding is removed entirely the absolute difference is 2 microseconds which
isn't very meaningful.

A large array object might show a much larger difference, and I think it is worth doing the constant folding if possible.


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