diff options
Diffstat (limited to 'gcc/expr.c')
| -rw-r--r-- | gcc/expr.c | 32 |
1 files changed, 31 insertions, 1 deletions
@@ -3819,6 +3819,7 @@ store_constructor (exp, target, cleared) int cleared; { tree type = TREE_TYPE (exp); + rtx exp_size = expr_size (exp); /* We know our target cannot conflict, since safe_from_p has been called. */ #if 0 @@ -3880,6 +3881,7 @@ store_constructor (exp, target, cleared) for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt)) { register tree field = TREE_PURPOSE (elt); + tree value = TREE_VALUE (elt); register enum machine_mode mode; int bitsize; int bitpos = 0; @@ -3951,8 +3953,36 @@ store_constructor (exp, target, cleared) RTX_UNCHANGING_P (to_rtx) = 1; } +#ifdef WORD_REGISTER_OPERATIONS + /* If this initializes a field that is smaller than a word, at the + start of a word, try to widen it to a full word. + This special case allows us to output C++ member function + initializations in a form that the optimizers can understand. */ + if (constant + && GET_CODE (target) == REG + && bitsize < BITS_PER_WORD + && bitpos % BITS_PER_WORD == 0 + && GET_MODE_CLASS (mode) == MODE_INT + && TREE_CODE (value) == INTEGER_CST + && GET_CODE (exp_size) == CONST_INT + && bitpos + BITS_PER_WORD <= INTVAL (exp_size) * BITS_PER_UNIT) + { + tree type = TREE_TYPE (value); + if (TYPE_PRECISION (type) < BITS_PER_WORD) + { + type = type_for_size (BITS_PER_WORD, TREE_UNSIGNED (type)); + value = convert (type, value); + } + if (BYTES_BIG_ENDIAN) + value + = fold (build (LSHIFT_EXPR, type, value, + build_int_2 (BITS_PER_WORD - bitsize, 0))); + bitsize = BITS_PER_WORD; + mode = word_mode; + } +#endif store_constructor_field (to_rtx, bitsize, bitpos, - mode, TREE_VALUE (elt), type, cleared); + mode, value, type, cleared); } } else if (TREE_CODE (type) == ARRAY_TYPE) |