Comment by bluGill

Comment by bluGill a day ago

Most people use -O2 and so if you use -O3 you risk some bug in the optimizer that nobody else noticed yet. -O2 is less likely to have problems.

In my experience a team of 200 developers will see 1 compiler bug affect them every 10 years. This isn't scientific, but it is a good rule of thumb and may put the above in perspective.

macintux a day ago

Would you say that bug estimate is when using -O2 or -O3?

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bluGill a day ago

The estimate includes visual studio, and other compilers that are not open source for whatever optimization options we were using at the time. As such your question doesn't make sense (not that it is bad, but it doesn't make sense).
In the case of open source compilers the bug was generally fixed upstream and we just needed to get on a newer release.

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