diff options
| author | jamborm <jamborm@138bc75d-0d04-0410-961f-82ee72b054a4> | 2013-08-06 09:22:16 +0000 |
|---|---|---|
| committer | jamborm <jamborm@138bc75d-0d04-0410-961f-82ee72b054a4> | 2013-08-06 09:22:16 +0000 |
| commit | 54dfdbf24d54894b00ee4efe20482f27762c27b2 (patch) | |
| tree | 730d33490774e04b2abb023fd8b3dd4ca868bf3f /gcc/gimple-ssa-strength-reduction.c | |
| parent | 2546266f931e7bea07456b874ece8816369dad2f (diff) | |
| download | gcc-54dfdbf24d54894b00ee4efe20482f27762c27b2.tar.gz | |
2013-08-06 Martin Jambor <mjambor@suse.cz>
PR middle-end/58041
* gimple-ssa-strength-reduction.c (replace_ref): Make sure built
MEM_REF has proper alignment information.
testsuite/
* gcc.dg/torture/pr58041.c: New test.
* gcc.target/arm/pr58041.c: Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@201523 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/gimple-ssa-strength-reduction.c')
| -rw-r--r-- | gcc/gimple-ssa-strength-reduction.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/gcc/gimple-ssa-strength-reduction.c b/gcc/gimple-ssa-strength-reduction.c index c6f305c35ea..e85e6293db4 100644 --- a/gcc/gimple-ssa-strength-reduction.c +++ b/gcc/gimple-ssa-strength-reduction.c @@ -1728,11 +1728,23 @@ dump_incr_vec (void) static void replace_ref (tree *expr, slsr_cand_t c) { - tree add_expr = fold_build2 (POINTER_PLUS_EXPR, TREE_TYPE (c->base_expr), - c->base_expr, c->stride); - tree mem_ref = fold_build2 (MEM_REF, TREE_TYPE (*expr), add_expr, - double_int_to_tree (c->cand_type, c->index)); - + tree add_expr, mem_ref, acc_type = TREE_TYPE (*expr); + unsigned HOST_WIDE_INT misalign; + unsigned align; + + /* Ensure the memory reference carries the minimum alignment + requirement for the data type. See PR58041. */ + get_object_alignment_1 (*expr, &align, &misalign); + if (misalign != 0) + align = (misalign & -misalign); + if (align < TYPE_ALIGN (acc_type)) + acc_type = build_aligned_type (acc_type, align); + + add_expr = fold_build2 (POINTER_PLUS_EXPR, TREE_TYPE (c->base_expr), + c->base_expr, c->stride); + mem_ref = fold_build2 (MEM_REF, acc_type, add_expr, + double_int_to_tree (c->cand_type, c->index)); + /* Gimplify the base addressing expression for the new MEM_REF tree. */ gimple_stmt_iterator gsi = gsi_for_stmt (c->cand_stmt); TREE_OPERAND (mem_ref, 0) |