> Well, just for record, the final version of patch seems to make sense for me 
> ;)
> Thanks! It is an interesting side corner to say at least.

Of course one could craft an function with two builtin_constant_p calls and
the asm statement that is not dominated by either of them but still always 
constant.
I am not sure how far we want to go guaranting that constant propagation
happen. I think the simple dominator cases are enough in practice.

Honza
> 
> Honza

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