Re: patch: [mem-ssa] remove V_MUST_DEFs

[Andrew Pinski <pinskia at physics dot uc dot edu>]

On Mar 17, 2006, at 3:41 PM, Andrew Pinski wrote:

> On Mar 17, 2006, at 3:35 PM, Aldy Hernandez wrote:
>
> > There is one regression: gcc.dg/tree-ssa/complex-4.c in which DCE 
> > fails
> > to remove the original store clearing the complex variable.  Diego 
> > looked
> > at it, and suggested we fix DSE (not DCE) instead.  I will do so in a
> > followup patch.
>
> Can you attach the dump to see why DCE/DSE is not removing it?
> Since this is a testcase which I generated I would like to see why
> this is failing.

Never mind, it really does not matter as I can reproduce a similar 
failure
with structs, though it is worse as even with V_MUST_DEF we don't 
remove the
assignment:
struct s
{
  int i;
  int j;
};


struct s g(struct s s1)
{
  struct s s2;
  s2 = s1;
  s2.i = s1.i+2;
  s2.j = s1.j+2;
  return s2;
}


-- Pinski