diff options
| author | Richard Guenther <rguenther@suse.de> | 2009-06-20 12:03:16 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2009-06-20 12:03:16 +0000 |
| commit | 825be69e343144b0608da6056d92dc5b71eb50c2 (patch) | |
| tree | 184a74dea43f320ee54cbce63562ba24f77061d9 /gcc/tree-ssa-structalias.c | |
| parent | 8a45323c1634094c568274d44f4780550708589c (diff) | |
| download | gcc-825be69e343144b0608da6056d92dc5b71eb50c2.zip gcc-825be69e343144b0608da6056d92dc5b71eb50c2.tar.gz gcc-825be69e343144b0608da6056d92dc5b71eb50c2.tar.bz2 | |
tree-ssa-structalias.c (find_func_aliases): For memset use a constraint from NULL if we memset to zero.
2009-06-20 Richard Guenther <rguenther@suse.de>
* tree-ssa-structalias.c (find_func_aliases): For memset use
a constraint from NULL if we memset to zero.
* tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Add builtins
we explicitly handle that do not read from memory.
(call_may_clobber_ref_p_1): Properly handle builtins that may
set errno.
From-SVN: r148747
Diffstat (limited to 'gcc/tree-ssa-structalias.c')
| -rw-r--r-- | gcc/tree-ssa-structalias.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c index 09b8762..ac2c7dc 100644 --- a/gcc/tree-ssa-structalias.c +++ b/gcc/tree-ssa-structalias.c @@ -3674,8 +3674,17 @@ find_func_aliases (gimple origt) } get_constraint_for_ptr_offset (dest, NULL_TREE, &lhsc); do_deref (&lhsc); - ac.type = SCALAR; - ac.var = integer_id; + if (flag_delete_null_pointer_checks + && integer_zerop (gimple_call_arg (t, 1))) + { + ac.type = ADDRESSOF; + ac.var = nothing_id; + } + else + { + ac.type = SCALAR; + ac.var = integer_id; + } ac.offset = 0; for (i = 0; VEC_iterate (ce_s, lhsc, i, lhsp); ++i) process_constraint (new_constraint (*lhsp, ac)); |