This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [tree-ssa] live analysis on local static functions


On Tue, 2003-10-14 at 13:05, Andrew MacLeod wrote:
> On Tue, 2003-10-14 at 13:03, law@redhat.com wrote:
> > In message <1066149766.10504.1982.camel@p4>, Andrew MacLeod writes:
> 
> >  >
> >  >I get out of ssa producing:
> >  >
> >  >q ()
> >  >{
> >  >  char * <U1244>;
> >  >  char * retval.2;
> >  >  char * T.1;
> >  >
> >  >
> >  >  # BLOCK 0.  PRED: -1.  SUCC: 1.
> >  >  {
> >  >    {
> >  >      static char * a = (char *)"";
> >  >
> >  >
> >  >      #   VUSE <a_1>;
> >  >      <U1244> = a;
> >  >      goto <U11d0>;;
> >  >    };
> >  >
> >  >    # BLOCK 1.  PRED: 0.  SUCC: 2.
> >  >    <U11d0>:;;
> >  >    (void)0;
> >  >  };
> >  >
> >  >  # BLOCK 2.  PRED: 1.  SUCC: -2.
> >  >  (void)0;
> >  >  return <U1244>;;
> >  >}
> >  >
> 
> > But it still seems to me that something is missing the fact that "a"
> > is actually used.  If "a" is marked as used, then everything ought to
> > work as expected.
> 
> I am currently looking at why the VUSE <a_1> didnt mark 'a' as used.
> 
INterestingly, the 'a' in the BIND  has address 
$7 = (union tree_node *) 0x400b12b8
and the 'a' used as a base for 'a_1' is:
$9 = (union tree_node *) 0x400adbc8

so used is set on the one in $9, but never set on the one in $7.

Diego, any idea why we're using a different VAR_DECL?
Andrew



Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]