diff options
Diffstat (limited to 'gcc-4.9/gcc/alias.c')
| -rw-r--r-- | gcc-4.9/gcc/alias.c | 66 |
1 files changed, 0 insertions, 66 deletions
diff --git a/gcc-4.9/gcc/alias.c b/gcc-4.9/gcc/alias.c index 434ae7ad3..e5406123c 100644 --- a/gcc-4.9/gcc/alias.c +++ b/gcc-4.9/gcc/alias.c @@ -157,7 +157,6 @@ static rtx find_base_value (rtx); static int mems_in_disjoint_alias_sets_p (const_rtx, const_rtx); static int insert_subset_children (splay_tree_node, void*); static alias_set_entry get_alias_set_entry (alias_set_type); -static bool nonoverlapping_component_refs_p (const_rtx, const_rtx); static tree decl_for_component_ref (tree); static int write_dependence_p (const_rtx, const_rtx, enum machine_mode, rtx, @@ -2259,68 +2258,6 @@ read_dependence (const_rtx mem, const_rtx x) return false; } -/* Return true if we can determine that the fields referenced cannot - overlap for any pair of objects. */ - -static bool -nonoverlapping_component_refs_p (const_rtx rtlx, const_rtx rtly) -{ - const_tree x = MEM_EXPR (rtlx), y = MEM_EXPR (rtly); - const_tree fieldx, fieldy, typex, typey, orig_y; - - if (!flag_strict_aliasing - || !x || !y - || TREE_CODE (x) != COMPONENT_REF - || TREE_CODE (y) != COMPONENT_REF) - return false; - - do - { - /* The comparison has to be done at a common type, since we don't - know how the inheritance hierarchy works. */ - orig_y = y; - do - { - fieldx = TREE_OPERAND (x, 1); - typex = TYPE_MAIN_VARIANT (DECL_FIELD_CONTEXT (fieldx)); - - y = orig_y; - do - { - fieldy = TREE_OPERAND (y, 1); - typey = TYPE_MAIN_VARIANT (DECL_FIELD_CONTEXT (fieldy)); - - if (typex == typey) - goto found; - - y = TREE_OPERAND (y, 0); - } - while (y && TREE_CODE (y) == COMPONENT_REF); - - x = TREE_OPERAND (x, 0); - } - while (x && TREE_CODE (x) == COMPONENT_REF); - /* Never found a common type. */ - return false; - - found: - /* If we're left with accessing different fields of a structure, then no - possible overlap, unless they are both bitfields. */ - if (TREE_CODE (typex) == RECORD_TYPE && fieldx != fieldy) - return !(DECL_BIT_FIELD (fieldx) && DECL_BIT_FIELD (fieldy)); - - /* The comparison on the current field failed. If we're accessing - a very nested structure, look at the next outer level. */ - x = TREE_OPERAND (x, 0); - y = TREE_OPERAND (y, 0); - } - while (x && y - && TREE_CODE (x) == COMPONENT_REF - && TREE_CODE (y) == COMPONENT_REF); - - return false; -} - /* Look at the bottom of the COMPONENT_REF list for a DECL, and return it. */ static tree @@ -2596,9 +2533,6 @@ true_dependence_1 (const_rtx mem, enum machine_mode mem_mode, rtx mem_addr, if (nonoverlapping_memrefs_p (mem, x, false)) return 0; - if (nonoverlapping_component_refs_p (mem, x)) - return 0; - return rtx_refs_may_alias_p (x, mem, true); } |