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Re: Designs for better debug info in GCC
On Nov 8, 2007, Michael Matz <matz@suse.de> wrote:
> If you want to be really sure no arguments disappear (necessary for
> instance for meaningful use of systemtap) you also need to inhibit
> some transformations,
I'm not aware of any situations in which we must force an argument not
to disappear. All of the problems I'm aware of are those in which the
argument is there, we're just missing debug information for it. If
you have information about needs for preserving arguments that are
actually dead, please send it my way.
> This is a problem on it's own. We're planning to work on this somewhen
> during the next months, i.e. improve code quality at -O0 at least to a
> point it was in the 3.x line of GCC.
Aah, I guess the problem here is all the gimple-introduced temps,
right? That our current -O0 is more like -O-1? :-)
--
Alexandre Oliva http://www.lsd.ic.unicamp.br/~oliva/
FSF Latin America Board Member http://www.fsfla.org/
Red Hat Compiler Engineer aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist oliva@{lsd.ic.unicamp.br, gnu.org}