[RFC] Mixed results with O(1) PHI arg lookup

[Kazu Hirata]

Hi Dorit,

> > The patch survived a bootstrap, but it should not pass testsuite
> > because I have not fixed a part of tree_vectorizer.c that directly
> > writes PHI_ARG_EDGE.
> 
> The code that directly writes PHI_ARG_EDGE in the vectorizer will go away
> once this patch is installed:
> http://gcc.gnu.org/ml/gcc-patches/2004-11/msg00283.html

Wow.  Thanks for update.  I was a bit heasitating to go through the
code there. ;-)

Kazu Hirata