diff options
| author | Michael Matz <matz@suse.de> | 2012-06-12 11:52:41 +0000 |
|---|---|---|
| committer | Michael Matz <matz@suse.de> | 2012-06-12 11:52:41 +0000 |
| commit | bbaac6a32bf37c0ce43c88f46ab2ff46e42361e0 (patch) | |
| tree | 08829258d4fe6802e2f465d6ba336e5a409258ca /gcc/alias.c | |
| parent | 064897fa09334172ec317e401112681fc7253240 (diff) | |
* alias.c (nonoverlapping_component_refs_p): Take two rtx arguments.
(nonoverlapping_memrefs_p): Don't call it here ...
(true_dependence_1): ... but here.
testsuite/
* gcc.dg/torture/alias-1.c: New test.
git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@188448 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/alias.c')
| -rw-r--r-- | gcc/alias.c | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/gcc/alias.c b/gcc/alias.c index fbc4e1031d9..c11b13f3657 100644 --- a/gcc/alias.c +++ b/gcc/alias.c @@ -156,7 +156,7 @@ 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_tree, const_tree); +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, int); @@ -2181,11 +2181,15 @@ read_dependence (const_rtx mem, const_rtx x) overlap for any pair of objects. */ static bool -nonoverlapping_component_refs_p (const_tree x, const_tree y) +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) + if (!flag_strict_aliasing + || !x || !y + || TREE_CODE (x) != COMPONENT_REF + || TREE_CODE (y) != COMPONENT_REF) return false; do @@ -2304,13 +2308,6 @@ nonoverlapping_memrefs_p (const_rtx x, const_rtx y, bool loop_invariant) && ! MEM_OFFSET_KNOWN_P (y))) return 0; - /* If both are field references, we may be able to determine something. */ - if (TREE_CODE (exprx) == COMPONENT_REF - && TREE_CODE (expry) == COMPONENT_REF - && nonoverlapping_component_refs_p (exprx, expry)) - return 1; - - /* If the field reference test failed, look at the DECLs involved. */ moffsetx_known_p = MEM_OFFSET_KNOWN_P (x); if (moffsetx_known_p) @@ -2516,6 +2513,9 @@ 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); } |