diff options
| author | Christoph Muellner <christoph.muellner@theobroma-systems.com> | 2018-09-26 21:58:13 +0200 |
|---|---|---|
| committer | Christoph Muellner <christoph.muellner@theobroma-systems.com> | 2019-08-30 20:10:54 +0200 |
| commit | fa497e3548e0dc0d11b259d299ee39c11db0d98f (patch) | |
| tree | 990f0617d28df3855a701d9030eccbe6fc82e6ee | |
| parent | 93b7840902ae6da75f8000a34b619dac352e3b5e (diff) | |
Add commandline option to bypass aliasing-checks.
This patch introduces the flag -fnoalias to bypass alias-checks
in the SSA alias analyser.
Signed-off-by: Christoph Muellner <christoph.muellner@theobroma-systems.com>
| -rw-r--r-- | gcc/common.opt | 4 | ||||
| -rw-r--r-- | gcc/tree-ssa-structalias.c | 6 |
2 files changed, 7 insertions, 3 deletions
diff --git a/gcc/common.opt b/gcc/common.opt index 658c0798720c..6f43ef937e95 100644 --- a/gcc/common.opt +++ b/gcc/common.opt @@ -2717,6 +2717,10 @@ funroll-more Common Report Var(flag_unroll_more) Optimization Unroll a bit more. +fnoalias +Common Report Var(flag_noalias) Optimization +Assume no aliasing in the whole program. + funwind-tables Common Report Var(flag_unwind_tables) Optimization Just generate unwind tables for exception handling. diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c index 373946f518ab..0cb4afaf1e55 100644 --- a/gcc/tree-ssa-structalias.c +++ b/gcc/tree-ssa-structalias.c @@ -5655,7 +5655,7 @@ push_fields_onto_fieldstack (tree type, vec<fieldoff_s> *fieldstack, e.only_restrict_pointers = (!has_unknown_size && POINTER_TYPE_P (field_type) - && TYPE_RESTRICT (field_type)); + && (TYPE_RESTRICT (field_type) || flag_noalias)); if (e.only_restrict_pointers) e.restrict_pointed_type = TREE_TYPE (field_type); fieldstack->safe_push (e); @@ -6013,7 +6013,7 @@ create_variable_info_for_1 (tree decl, const char *name, bool add_id, vi->size = vi->fullsize; vi->is_full_var = true; if (POINTER_TYPE_P (decl_type) - && TYPE_RESTRICT (decl_type)) + && (TYPE_RESTRICT (decl_type) || flag_noalias)) vi->only_restrict_pointers = 1; if (vi->only_restrict_pointers && !type_contains_placeholder_p (TREE_TYPE (decl_type)) @@ -6127,7 +6127,7 @@ create_variable_info_for (tree decl, const char *name, bool add_id) /* Mark global restrict qualified pointers. */ if ((POINTER_TYPE_P (TREE_TYPE (decl)) - && TYPE_RESTRICT (TREE_TYPE (decl))) + && (TYPE_RESTRICT (TREE_TYPE (decl)) || flag_noalias)) || vi->only_restrict_pointers) { varinfo_t rvi |