From 4e9bb42b21a8399500c0021fa991a79c8c0574fa Mon Sep 17 00:00:00 2001 From: Aldy Hernandez Date: Wed, 13 Mar 2002 02:03:36 +0000 Subject: expmed.c (store_bit_field): Reset alias set for memory. 2002-03-13 Aldy Hernandez * expmed.c (store_bit_field): Reset alias set for memory. (extract_bit_field): Same. From-SVN: r50706 --- gcc/expmed.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'gcc/expmed.c') 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. */ -- cgit v1.2.1