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| author | Richard Guenther <rguenther@suse.de> | 2008-07-11 12:44:26 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2008-07-11 12:44:26 +0000 |
| commit | 941a9479d0a4d5fb26182ee6c485c4bf210a6499 (patch) | |
| tree | 29119b8b42e6cea42c417962f700ad7f2f026831 /gcc/tree-ssa-alias.c | |
| parent | d5e1c95e49927a55aef30e2c8f4091fdd49aba2d (diff) | |
| download | gcc-941a9479d0a4d5fb26182ee6c485c4bf210a6499.zip gcc-941a9479d0a4d5fb26182ee6c485c4bf210a6499.tar.gz gcc-941a9479d0a4d5fb26182ee6c485c4bf210a6499.tar.bz2 | |
re PR tree-optimization/36765 (Revision 137573 miscompiles 464.h264ref in SPEC CPU 2006)
2008-07-11 Richard Guenther <rguenther@suse.de>
PR tree-optimization/36765
* tree-ssa-alias.c (compute_flow_insensitive_aliasing): Add
aliases from HEAP vars to SMTs.
* gcc.c-torture/execute/pr36765.c: New testcase.
From-SVN: r137715
Diffstat (limited to 'gcc/tree-ssa-alias.c')
| -rw-r--r-- | gcc/tree-ssa-alias.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index d4a1e21..3aa79fe 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -2370,6 +2370,8 @@ have_common_aliases_p (bitmap tag1aliases, bitmap tag2aliases) static void compute_flow_insensitive_aliasing (struct alias_info *ai) { + referenced_var_iterator rvi; + tree var; size_t i; timevar_push (TV_FLOW_INSENSITIVE); @@ -2460,6 +2462,24 @@ compute_flow_insensitive_aliasing (struct alias_info *ai) add_may_alias (tag1, tag2); } } + + /* We have to add all HEAP variables to all SMTs aliases bitmaps. + As we don't know which effective type the HEAP will have we cannot + do better here and we need the conflicts with obfuscated pointers + (a simple (*(int[n] *)ptr)[i] will do, with ptr from a VLA array + allocation). */ + for (i = 0; i < ai->num_pointers; i++) + { + struct alias_map_d *p_map = ai->pointers[i]; + tree tag = symbol_mem_tag (p_map->var); + + FOR_EACH_REFERENCED_VAR (var, rvi) + { + if (var_ann (var)->is_heapvar) + add_may_alias (tag, var); + } + } + timevar_pop (TV_FLOW_INSENSITIVE); } |