diff options
| author | Richard Biener <rguenther@suse.de> | 2016-06-29 07:30:31 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2016-06-29 07:30:31 +0000 |
| commit | 4aa83879c93d2367f5245c94bd2f12c19f486dae (patch) | |
| tree | 29eb8891c24a3daecbf68e50445cf77606b498d4 /gcc/gimple.c | |
| parent | 36088299955f95ab58a5758cba2f29b84c8fbfbc (diff) | |
re PR middle-end/71002 (-fstrict-aliasing breaks Boost's short string optimization implementation)
2016-06-29 Richard Biener <rguenther@suse.de>
PR middle-end/71002
* alias.c (component_uses_parent_alias_set_from): Handle
type punning through union accesses by using the union alias set.
* gimple.c (gimple_get_alias_set): Remove union type punning case.
c-family/
* c-common.c (c_common_get_alias_set): Remove union type punning case.
fortran/
* f95-lang.c (LANG_HOOKS_GET_ALIAS_SET): Remove (un-)define.
(gfc_get_alias_set): Remove.
* g++.dg/torture/pr71002.C: Adjust testcase.
From-SVN: r237839
Diffstat (limited to 'gcc/gimple.c')
| -rw-r--r-- | gcc/gimple.c | 15 |
1 files changed, 0 insertions, 15 deletions
diff --git a/gcc/gimple.c b/gcc/gimple.c index 677c5607090..e275dfc3c52 100644 --- a/gcc/gimple.c +++ b/gcc/gimple.c @@ -2400,21 +2400,6 @@ gimple_signed_type (tree type) alias_set_type gimple_get_alias_set (tree t) { - tree u; - - /* Permit type-punning when accessing a union, provided the access - is directly through the union. For example, this code does not - permit taking the address of a union member and then storing - through it. Even the type-punning allowed here is a GCC - extension, albeit a common and useful one; the C standard says - that such accesses have implementation-defined behavior. */ - for (u = t; - TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF; - u = TREE_OPERAND (u, 0)) - if (TREE_CODE (u) == COMPONENT_REF - && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE) - return 0; - /* That's all the expressions we handle specially. */ if (!TYPE_P (t)) return -1; |