diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/tree-dfa.c | 23 | ||||
| -rw-r--r-- | gcc/tree-flow.h | 1 | ||||
| -rw-r--r-- | gcc/tree-ssa-live.c | 25 |
4 files changed, 48 insertions, 8 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e79b7de..b5addb8 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,12 @@ 2007-01-14 Jan Hubicka <jh@suse.cz> + * tree-dfa.c (remove_referenced_var): New function. + * tree-ssa-live.c (remove_unused_locals): Walk referenced vars and + prune referenced vars list too. + * tree-flow.h (remove_referenced_var): Declare. + +2007-01-14 Jan Hubicka <jh@suse.cz> + * tree-eh.c (add_stmt_to_eh_region_fn): Do not add call_exprs separately. (remove_stmt_from_eh_region_fn): Do not remove call_exprs. diff --git a/gcc/tree-dfa.c b/gcc/tree-dfa.c index 59899f1..93c58f78 100644 --- a/gcc/tree-dfa.c +++ b/gcc/tree-dfa.c @@ -752,6 +752,29 @@ add_referenced_var (tree var) } } +/* Remove VAR from the list. */ + +void +remove_referenced_var (tree var) +{ + var_ann_t v_ann; + struct int_tree_map in; + void **loc; + unsigned int uid = DECL_UID (var); + + clear_call_clobbered (var); + v_ann = get_var_ann (var); + ggc_free (v_ann); + var->base.ann = NULL; + gcc_assert (DECL_P (var)); + in.uid = uid; + in.to = var; + loc = htab_find_slot_with_hash (gimple_referenced_vars (cfun), &in, uid, + NO_INSERT); + ggc_free (*loc); + htab_clear_slot (gimple_referenced_vars (cfun), loc); +} + /* Return the virtual variable associated to the non-scalar variable VAR. */ diff --git a/gcc/tree-flow.h b/gcc/tree-flow.h index 5bd07dc..0b029ee 100644 --- a/gcc/tree-flow.h +++ b/gcc/tree-flow.h @@ -698,6 +698,7 @@ extern void dump_subvars_for (FILE *, tree); extern void debug_subvars_for (tree); extern tree get_virtual_var (tree); extern void add_referenced_var (tree); +extern void remove_referenced_var (tree); extern void mark_symbols_for_renaming (tree); extern void find_new_referenced_vars (tree *); diff --git a/gcc/tree-ssa-live.c b/gcc/tree-ssa-live.c index eecf6e7..cc4972f 100644 --- a/gcc/tree-ssa-live.c +++ b/gcc/tree-ssa-live.c @@ -449,15 +449,12 @@ remove_unused_locals (void) { basic_block bb; tree t, *cell; + referenced_var_iterator rvi; + var_ann_t ann; /* Assume all locals are unused. */ - for (t = cfun->unexpanded_var_list; t; t = TREE_CHAIN (t)) - { - tree var = TREE_VALUE (t); - if (TREE_CODE (var) != FUNCTION_DECL - && var_ann (var)) - var_ann (var)->used = false; - } + FOR_EACH_REFERENCED_VAR (t, rvi) + var_ann (t)->used = false; /* Walk the CFG marking all referenced symbols. */ FOR_EACH_BB (bb) @@ -493,7 +490,6 @@ remove_unused_locals (void) for (cell = &cfun->unexpanded_var_list; *cell; ) { tree var = TREE_VALUE (*cell); - var_ann_t ann; if (TREE_CODE (var) != FUNCTION_DECL && (!(ann = var_ann (var)) @@ -505,6 +501,19 @@ remove_unused_locals (void) cell = &TREE_CHAIN (*cell); } + + /* Remove unused variables from REFERENCED_VARs. As an special exception + keep the variables that are believed to be aliased. Those can't be + easilly removed from the alias sets and and operand caches. + They will be removed shortly after next may_alias pass is performed. */ + FOR_EACH_REFERENCED_VAR (t, rvi) + if (!is_global_var (t) + && !MTAG_P (t) + && TREE_CODE (t) != PARM_DECL + && TREE_CODE (t) != RESULT_DECL + && !(ann = var_ann (t))->used + && !ann->is_aliased && !is_call_clobbered (t) && !ann->symbol_mem_tag) + remove_referenced_var (t); } |