diff options
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 6d58ea9957e..48a3ef60278 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -392,6 +392,15 @@ store_bit_field (str_rtx, bitsize, bitnum, fieldmode, value, total_size) } } + /* We may be accessing data outside the field, which means + we can alias adjacent data. */ + if (GET_CODE (op0) == MEM) + { + op0 = shallow_copy_rtx (op0); + set_mem_alias_set (op0, 0); + set_mem_expr (op0, 0); + } + /* If OP0 is a register, BITPOS must count within a word. But as we have it, it counts within whatever size OP0 now has. On a bigendian machine, these are not the same, so convert. */ @@ -1069,6 +1078,15 @@ extract_bit_field (str_rtx, bitsize, bitnum, unsignedp, } } + /* We may be accessing data outside the field, which means + we can alias adjacent data. */ + if (GET_CODE (op0) == MEM) + { + op0 = shallow_copy_rtx (op0); + set_mem_alias_set (op0, 0); + set_mem_expr (op0, 0); + } + /* ??? We currently assume TARGET is at least as big as BITSIZE. If that's wrong, the solution is to test for it and set TARGET to 0 if needed. */ |