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-rw-r--r--gcc-4.9/gcc/tree-vect-data-refs.c38
1 files changed, 16 insertions, 22 deletions
diff --git a/gcc-4.9/gcc/tree-vect-data-refs.c b/gcc-4.9/gcc/tree-vect-data-refs.c
index c3e423a5f..74268089c 100644
--- a/gcc-4.9/gcc/tree-vect-data-refs.c
+++ b/gcc-4.9/gcc/tree-vect-data-refs.c
@@ -615,7 +615,6 @@ vect_compute_data_ref_alignment (struct data_reference *dr)
tree ref = DR_REF (dr);
tree vectype;
tree base, base_addr;
- bool base_aligned;
tree misalign;
tree aligned_to, alignment;
@@ -688,6 +687,18 @@ vect_compute_data_ref_alignment (struct data_reference *dr)
}
base = build_fold_indirect_ref (base_addr);
+ /* To look at alignment of the base we have to preserve an inner MEM_REF
+ as that carriese alignment information of the actual access. */
+ while (handled_component_p (base))
+ base = TREE_OPERAND (base, 0);
+ if (TREE_CODE (base) == MEM_REF)
+ base = build2 (MEM_REF, TREE_TYPE(base), base_addr,
+ build_int_cst (TREE_TYPE (TREE_OPERAND (base, 1)), 0));
+ unsigned int base_alignment = get_object_alignment (base);
+
+ if (base_alignment >= TYPE_ALIGN (TREE_TYPE (vectype)))
+ DR_VECT_AUX (dr)->base_element_aligned = true;
+
alignment = ssize_int (TYPE_ALIGN (vectype)/BITS_PER_UNIT);
if ((aligned_to && tree_int_cst_compare (aligned_to, alignment) < 0)
@@ -703,19 +714,7 @@ vect_compute_data_ref_alignment (struct data_reference *dr)
return true;
}
- if ((DECL_P (base)
- && tree_int_cst_compare (ssize_int (DECL_ALIGN_UNIT (base)),
- alignment) >= 0)
- || (TREE_CODE (base_addr) == SSA_NAME
- && tree_int_cst_compare (ssize_int (TYPE_ALIGN_UNIT (TREE_TYPE (
- TREE_TYPE (base_addr)))),
- alignment) >= 0)
- || (get_pointer_alignment (base_addr) >= TYPE_ALIGN (vectype)))
- base_aligned = true;
- else
- base_aligned = false;
-
- if (!base_aligned)
+ if (base_alignment < TYPE_ALIGN (vectype))
{
/* Do not change the alignment of global variables here if
flag_section_anchors is enabled as we already generated
@@ -744,8 +743,9 @@ vect_compute_data_ref_alignment (struct data_reference *dr)
dump_printf (MSG_NOTE, "\n");
}
- ((dataref_aux *)dr->aux)->base_decl = base;
- ((dataref_aux *)dr->aux)->base_misaligned = true;
+ DR_VECT_AUX (dr)->base_decl = base;
+ DR_VECT_AUX (dr)->base_misaligned = true;
+ DR_VECT_AUX (dr)->base_element_aligned = true;
}
/* If this is a backward running DR then first access in the larger
@@ -3920,12 +3920,6 @@ vect_create_addr_base_for_vector_ref (gimple stmt,
base_offset = fold_build2 (PLUS_EXPR, sizetype,
base_offset, byte_offset);
}
- if (byte_offset)
- {
- byte_offset = fold_convert (sizetype, byte_offset);
- base_offset = fold_build2 (PLUS_EXPR, sizetype,
- base_offset, byte_offset);
- }
/* base + base_offset */
if (loop_vinfo)