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| author | Richard Guenther <rguenther@suse.de> | 2009-08-12 15:10:47 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2009-08-12 15:10:47 +0000 |
| commit | daad02781a10022ac810312c46fda483809c3634 (patch) | |
| tree | 637efc702dde071c504b6d68951b06bfb3f2b5c1 /gcc/alias.c | |
| parent | 30de16328a546dd06011235d86ef573dc2ffba6e (diff) | |
| download | gcc-daad02781a10022ac810312c46fda483809c3634.zip gcc-daad02781a10022ac810312c46fda483809c3634.tar.gz gcc-daad02781a10022ac810312c46fda483809c3634.tar.bz2 | |
alias.c (get_alias_set): Honor TYPE_STRUCTURAL_EQUALITY_P.
2009-08-12 Richard Guenther <rguenther@suse.de>
* alias.c (get_alias_set): Honor TYPE_STRUCTURAL_EQUALITY_P.
* gimplify.c (gimplify_modify_expr): Do not use
lang_hooks.types_compatible_p.
* tree-ssa.c (useless_type_conversion_p): For aggregates
just return false if the canonical types differ.
From-SVN: r150695
Diffstat (limited to 'gcc/alias.c')
| -rw-r--r-- | gcc/alias.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/gcc/alias.c b/gcc/alias.c index 442be82..eaa127e 100644 --- a/gcc/alias.c +++ b/gcc/alias.c @@ -680,11 +680,20 @@ get_alias_set (tree t) } /* Variant qualifiers don't affect the alias set, so get the main - variant. Always use the canonical type as well. - If this is a type with a known alias set, return it. */ + variant. */ t = TYPE_MAIN_VARIANT (t); - if (TYPE_CANONICAL (t)) - t = TYPE_CANONICAL (t); + + /* Always use the canonical type as well. If this is a type that + requires structural comparisons to identify compatible types + use alias set zero. */ + if (TYPE_STRUCTURAL_EQUALITY_P (t)) + return 0; + t = TYPE_CANONICAL (t); + /* Canonical types shouldn't form a tree nor should the canonical + type require structural equality checks. */ + gcc_assert (!TYPE_STRUCTURAL_EQUALITY_P (t) && TYPE_CANONICAL (t) == t); + + /* If this is a type with a known alias set, return it. */ if (TYPE_ALIAS_SET_KNOWN_P (t)) return TYPE_ALIAS_SET (t); |