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| author | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2009-09-24 13:47:26 +0000 |
|---|---|---|
| committer | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2009-09-24 13:47:26 +0000 |
| commit | 2164d9d3230baf603cd0ad6621b3e6cbbb36b6be (patch) | |
| tree | d59cda303be54e77c4ec9ffea649d8ef8215be09 /gcc/tree-ssa-forwprop.c | |
| parent | 354af4246fbe650a00173133354185900bfaaf86 (diff) | |
| download | gcc-2164d9d3230baf603cd0ad6621b3e6cbbb36b6be.tar.gz | |
2009-09-24 Richard Guenther <rguenther@suse.de>
PR tree-optimization/36143
PR tree-optimization/38747
* tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Only
create VIEW_CONVERT_EXPRs for TBAA compatible accesses.
* gcc.dg/tree-ssa/fre-vce-1.c: XFAIL.
* gcc.dg/tree-ssa/forwprop-6.c: Likewise.
* g++.dg/torture/pr38747.C: New testcase.
* g++.dg/tree-ssa/pr19637.C: Un-XFAIL.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@152122 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/tree-ssa-forwprop.c')
| -rw-r--r-- | gcc/tree-ssa-forwprop.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/gcc/tree-ssa-forwprop.c b/gcc/tree-ssa-forwprop.c index 5aec33415d4..87795a28223 100644 --- a/gcc/tree-ssa-forwprop.c +++ b/gcc/tree-ssa-forwprop.c @@ -831,7 +831,9 @@ forward_propagate_addr_expr_1 (tree name, tree def_rhs, && !TYPE_VOLATILE (TREE_TYPE (rhs)) && !TYPE_VOLATILE (TREE_TYPE (TREE_OPERAND (def_rhs, 0))) && operand_equal_p (TYPE_SIZE (TREE_TYPE (rhs)), - TYPE_SIZE (TREE_TYPE (TREE_OPERAND (def_rhs, 0))), 0)) + TYPE_SIZE (TREE_TYPE (TREE_OPERAND (def_rhs, 0))), 0) + /* Make sure we only do TBAA compatible replacements. */ + && get_alias_set (TREE_OPERAND (def_rhs, 0)) == get_alias_set (rhs)) { tree def_rhs_base, new_rhs = unshare_expr (TREE_OPERAND (def_rhs, 0)); new_rhs = fold_build1 (VIEW_CONVERT_EXPR, TREE_TYPE (rhs), new_rhs); |