diff options
| author | mmitchel <mmitchel@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-06-25 19:15:52 +0000 |
|---|---|---|
| committer | mmitchel <mmitchel@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-06-25 19:15:52 +0000 |
| commit | a2d3fb51261d2c7c8ecad59a4270e558e885aace (patch) | |
| tree | a7567c602d2f58762daefc23040540f890d619e4 | |
| parent | 3de45d63a63ba18c59222c20263e65a7ce883e9d (diff) | |
PR wrong-code/16129
* alias.c (get_alias_set): Adjust setting of
DECL_POINTER_ALIAS_SET for pointers to aggregates.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-3_4-branch@83673 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/alias.c | 15 |
2 files changed, 20 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 3f4a93d2d4d..4e39df32e5c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2004-06-25 Mark Mitchell <mark@codesourcery.com> + + PR wrong-code/16129 + * alias.c (get_alias_set): Adjust setting of + DECL_POINTER_ALIAS_SET for pointers to aggregates. + 2004-06-25 Richard Sandiford <rsandifo@redhat.com> PR target/16144 diff --git a/gcc/alias.c b/gcc/alias.c index dab10acad9a..5cce5e4d16f 100644 --- a/gcc/alias.c +++ b/gcc/alias.c @@ -500,6 +500,8 @@ get_alias_set (tree t) /* If we haven't computed the actual alias set, do it now. */ if (DECL_POINTER_ALIAS_SET (decl) == -2) { + tree pointed_to_type = TREE_TYPE (TREE_TYPE (decl)); + /* No two restricted pointers can point at the same thing. However, a restricted pointer can point at the same thing as an unrestricted pointer, if that unrestricted pointer @@ -508,11 +510,22 @@ get_alias_set (tree t) alias set for the type pointed to by the type of the decl. */ HOST_WIDE_INT pointed_to_alias_set - = get_alias_set (TREE_TYPE (TREE_TYPE (decl))); + = get_alias_set (pointed_to_type); if (pointed_to_alias_set == 0) /* It's not legal to make a subset of alias set zero. */ DECL_POINTER_ALIAS_SET (decl) = 0; + else if (AGGREGATE_TYPE_P (pointed_to_type)) + /* For an aggregate, we must treat the restricted + pointer the same as an ordinary pointer. If we + were to make the type pointed to by the + restricted pointer a subset of the pointed-to + type, then we would believe that other subsets + of the pointed-to type (such as fields of that + type) do not conflict with the type pointed to + by the restricted pointer. */ + DECL_POINTER_ALIAS_SET (decl) + = pointed_to_alias_set; else { DECL_POINTER_ALIAS_SET (decl) = new_alias_set (); |