Re: How to replace -O1 with corresponding -f's?

[Sergei Organov <osv at topconrd dot ru>]

Andrew Haley <aph@redhat.com> writes:

> Sergei Organov writes:
>  > Hi,
>  > 
>  > Using gcc compiled from gcc-4_0-branch, in an attempt to see which
>  > particular optimization option makes my test case to be mis-optimized, I
>  > try to replace -O1 (which toggles on the problem) with corresponding set
>  > of -fxxx optimization options.
> 
> In general you can't do this.  You can turn some optimization passes
> off, though.

Sigh :(

> 
>  > How one finds out what optimization pass misbehaves?
> 
> Look at the dumps.  If you use the gcc option -da you'll get a full
> set of RTL dump files.

I'm afraid that it's one of the tree optimization passes as
const.cc.00.expand is already [mis]optimized the way I don't like.

-- 
Sergei.