diff options
Diffstat (limited to 'gcc/tree-ssa-structalias.c')
| -rw-r--r-- | gcc/tree-ssa-structalias.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c index 974b639..75c6fae 100644 --- a/gcc/tree-ssa-structalias.c +++ b/gcc/tree-ssa-structalias.c @@ -3289,9 +3289,29 @@ get_constraint_for_component_ref (tree t, vec<ce_s> *results, return; } - /* Pretend to take the address of the base, we'll take care of - adding the required subset of sub-fields below. */ - get_constraint_for_1 (t, results, true, lhs_p); + /* Avoid creating pointer-offset constraints, so handle MEM_REF + offsets directly. Pretend to take the address of the base, + we'll take care of adding the required subset of sub-fields below. */ + if (TREE_CODE (t) == MEM_REF + && !integer_zerop (TREE_OPERAND (t, 0))) + { + poly_offset_int off = mem_ref_offset (t); + off <<= LOG2_BITS_PER_UNIT; + off += bitpos; + poly_int64 off_hwi; + if (off.to_shwi (&off_hwi)) + bitpos = off_hwi; + else + { + bitpos = 0; + bitmaxsize = -1; + } + get_constraint_for_1 (TREE_OPERAND (t, 0), results, false, lhs_p); + do_deref (results); + } + else + get_constraint_for_1 (t, results, true, lhs_p); + /* Strip off nothing_id. */ if (results->length () == 2) { |