[PATCH] Fix VTA updating in the combiner (PR debug/48343)

[Alexandre Oliva]

On Apr  5, 2011, Jakub Jelinek <jakub@redhat.com> wrote:

> or DF would have resetted those debug_insns referencing it
> (or replaced the pseudos in there with a debug temporary set before the last
> real use), otherwise debug insns would change the liveness of the pseudo.

Ah, right, that was the bit I was missing!  (it's unfortunate that SSA
and DF are so different in this regard)

> But with some previous propagate_for_debug calls in the same bb that
> guarantee (as the testcase shows) is no longer true.

I see.  The patch looks like the right fix, then.  Thanks!

-- 
Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/   FSF Latin America board member
Free Software Evangelist      Red Hat Brazil Compiler Engineer