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Re: Fix regression on PR46590 (slow compile with -O0)


Hi,

On Mon, 16 Jan 2012, Richard Guenther wrote:

> > Regstrapping in progress on x86_64-linux, okay for trunk?
> 
> Ok.

I've committed (r183305) a slightly changed variant that merges the two 
outer bitmap loops again, like so:

+             EXECUTE_IF_AND_COMPL_IN_BITMAP (work, old_conflicts, 0, i, bi)
                {
                  unsigned j;
                  bitmap_iterator bj;
-                 EXECUTE_IF_SET_IN_BITMAP (work, i + 1, j, bj)
+                 /* First the conflicts between new and old_conflicts.  */
+                 EXECUTE_IF_SET_IN_BITMAP (old_conflicts, 0, j, bj)
+                   add_stack_var_conflict (i, j);
+                 /* Then the conflicts between only the new members.  */
+                 EXECUTE_IF_AND_COMPL_IN_BITMAP (work, old_conflicts, i + 1,
+                                                 j, bj)
                    add_stack_var_conflict (i, j);
                }


Ciao,
Michael.


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