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Diffstat (limited to 'gcc/tree-ssa-structalias.c')
| -rw-r--r-- | gcc/tree-ssa-structalias.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c index 781eff30872..492907e5805 100644 --- a/gcc/tree-ssa-structalias.c +++ b/gcc/tree-ssa-structalias.c @@ -1706,7 +1706,8 @@ do_sd_constraint (constraint_graph_t graph, constraint_t c, the set. Use ESCAPED as representative instead. */ else if (v->id == escaped_id) flag |= bitmap_set_bit (sol, escaped_id); - else if (add_graph_edge (graph, lhs, t)) + else if (v->may_have_pointers + && add_graph_edge (graph, lhs, t)) flag |= bitmap_ior_into (sol, get_varinfo (t)->solution); /* If the variable is not exactly at the requested offset @@ -2885,6 +2886,16 @@ process_constraint (constraint_t t) /* ADDRESSOF on the lhs is invalid. */ gcc_assert (lhs.type != ADDRESSOF); + /* We shouldn't add constraints from things that cannot have pointers. + It's not completely trivial to avoid in the callers, so do it here. */ + if (rhs.type != ADDRESSOF + && !get_varinfo (rhs.var)->may_have_pointers) + return; + + /* Likewise adding to the solution of a non-pointer var isn't useful. */ + if (!get_varinfo (lhs.var)->may_have_pointers) + return; + /* This can happen in our IR with things like n->a = *p */ if (rhs.type == DEREF && lhs.type == DEREF && rhs.var != anything_id) { |