Re: [tree-ssa] Block merging (updated)

[Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>]

Hello,

> +   /* Remove labels from B and set bb_for_stmt to A for other statements.  */
> +   for (bsi = bsi_start (b); !bsi_end_p (bsi);)
> +     {
> +       if (TREE_CODE (bsi_stmt (bsi)) == LABEL_EXPR)
> +       bsi_remove (&bsi);
> +       else
> +       {
> +         set_bb_for_stmt (bsi_stmt (bsi), a);
> +         bsi_next (&bsi);
> +       }
> +     }
> 
> 
> This will remove user-declared labels.  IIRC some people wanted these to be
> preserved, e.g. for debugging purposes.  Perhaps tree_can_merge_blocks_p
> should be false if a user label heads the basic block.

there is IMHO no point in this, since rtl level cfgcleanup would do the
merging and removing of the label anyway.

Zdenek