Should STL specifically consider /Ob1 ?

[AlexGuteniev]

This is not an issue, just a question.

Should STL be optimized for /Ob1 build?

I mean if release is built with /O2 and /Ob1, a significant part of STL is inlined, since it is inline members of template class. Still template functions defined outside classes are not marked as inline and thus are not inlined.

(A project may be built with /O2 + /Ob1 if it does not benefit from /Ob2, and has degraded performance comparing to /Ob1. On the other hand, it is rather unusual case)

[StephanTLavavej]

The STL expects extensive inlining due to its reliance on small helper functions, and therefore I believe that /Ob1 is the wrong direction - if anything, the STL wants the new /Ob3 option (not implied by /O2, but perhaps in the future). I don’t have hard data, though.

[StephanTLavavej]

Billy O'Neal (@BillyONeal) mentioned that if you can find performance test cases where /Ob1 is superior to /Ob2 or /Ob3, we can look into changing this option.