diff options
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/expmed.c | 18 |
2 files changed, 23 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 48d9949..761ecb3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2002-03-13 Aldy Hernandez <aldyh@redhat.com> + + * expmed.c (store_bit_field): Reset alias set for memory. + (extract_bit_field): Same. + 2002-03-12 Kaveh R. Ghazi <ghazi@caip.rutgers.edu> * c-common.c (c_tree_code_type, c_tree_code_length, diff --git a/gcc/expmed.c b/gcc/expmed.c index 6d58ea9..48a3ef6 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. */ |