diff options
Diffstat (limited to 'gcc/expr.c')
| -rw-r--r-- | gcc/expr.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/gcc/expr.c b/gcc/expr.c index 05bb9b80f6c..9c2d2a64771 100644 --- a/gcc/expr.c +++ b/gcc/expr.c @@ -8923,7 +8923,7 @@ is_aligning_offset (tree offset, tree exp) tree string_constant (tree arg, tree *ptr_offset) { - tree array, offset; + tree array, offset, lower_bound; STRIP_NOPS (arg); if (TREE_CODE (arg) == ADDR_EXPR) @@ -8945,6 +8945,20 @@ string_constant (tree arg, tree *ptr_offset) if (TREE_CODE (array) != STRING_CST && TREE_CODE (array) != VAR_DECL) return 0; + + /* Check if the array has a non-zero lower bound. */ + lower_bound = array_ref_low_bound (TREE_OPERAND (arg, 0)); + if (!integer_zerop (lower_bound)) + { + /* If the offset and base aren't both constants, return 0. */ + if (TREE_CODE (lower_bound) != INTEGER_CST) + return 0; + if (TREE_CODE (offset) != INTEGER_CST) + return 0; + /* Adjust offset by the lower bound. */ + offset = size_diffop (fold_convert (sizetype, offset), + fold_convert (sizetype, lower_bound)); + } } else return 0; |