diff options
Diffstat (limited to 'gcc/builtins.c')
| -rw-r--r-- | gcc/builtins.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/builtins.c b/gcc/builtins.c index 4dc8a15..5f53342 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -473,6 +473,28 @@ get_pointer_alignment_1 (tree exp, unsigned int *alignp, if (TREE_CODE (exp) == ADDR_EXPR) return get_object_alignment_2 (TREE_OPERAND (exp, 0), alignp, bitposp, true); + else if (TREE_CODE (exp) == POINTER_PLUS_EXPR) + { + unsigned int align; + unsigned HOST_WIDE_INT bitpos; + bool res = get_pointer_alignment_1 (TREE_OPERAND (exp, 0), + &align, &bitpos); + if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST) + bitpos += TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)) * BITS_PER_UNIT; + else + { + unsigned int trailing_zeros = tree_ctz (TREE_OPERAND (exp, 1)); + if (trailing_zeros < HOST_BITS_PER_INT) + { + unsigned int inner = (1U << trailing_zeros) * BITS_PER_UNIT; + if (inner) + align = MIN (align, inner); + } + } + *alignp = align; + *bitposp = bitpos & (align - 1); + return res; + } else if (TREE_CODE (exp) == SSA_NAME && POINTER_TYPE_P (TREE_TYPE (exp))) { |