diff options
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 6e5d940..9fa3137 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -14963,6 +14963,34 @@ fold_indirect_ref_1 (tree type, tree op0) } } + /* ((foo*)&vectorfoo)[1] => BIT_FIELD_REF<vectorfoo,...> */ + if (TREE_CODE (sub) == POINTER_PLUS_EXPR + && TREE_CODE (TREE_OPERAND (sub, 1)) == INTEGER_CST) + { + tree op00 = TREE_OPERAND (sub, 0); + tree op01 = TREE_OPERAND (sub, 1); + tree op00type; + + STRIP_NOPS (op00); + op00type = TREE_TYPE (op00); + if (TREE_CODE (op00) == ADDR_EXPR + && TREE_CODE (TREE_TYPE (op00type)) == VECTOR_TYPE + && type == TREE_TYPE (TREE_TYPE (op00type))) + { + HOST_WIDE_INT offset = tree_low_cst (op01, 0); + tree part_width = TYPE_SIZE (type); + unsigned HOST_WIDE_INT part_widthi = tree_low_cst (part_width, 0)/BITS_PER_UNIT; + unsigned HOST_WIDE_INT indexi = offset * BITS_PER_UNIT; + tree index = bitsize_int (indexi); + + if (offset/part_widthi <= TYPE_VECTOR_SUBPARTS (TREE_TYPE (op00type))) + return fold_build3 (BIT_FIELD_REF, type, TREE_OPERAND (op00, 0), + part_width, index); + + } + } + + /* ((foo*)&complexfoo)[1] => __imag__ complexfoo */ if (TREE_CODE (sub) == POINTER_PLUS_EXPR && TREE_CODE (TREE_OPERAND (sub, 1)) == INTEGER_CST) |